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EFFECTIVE STRESS LAWS FOR MULTI_POROSITY MEDIA 被引量:3
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作者 陈勉 陈至达 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1999年第11期1207-1213,共7页
In this paper, the effective stress for multi-porosity elasticity model is presented by means of stress analysis for double porosity media elements. It is found that the effective stress law is not unique, it depends ... In this paper, the effective stress for multi-porosity elasticity model is presented by means of stress analysis for double porosity media elements. It is found that the effective stress law is not unique, it depends on the hypothesis of constitutive equations for multi-porosity media. Diversified effective stress laws for multi-porosity are developed. 展开更多
关键词 multi-porosity media porosity FRACTURE effective stress
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Saturated conductivity and effective porosity of the forest soil 被引量:1
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作者 李金中 裴铁凡 《Journal of Forestry Research》 SCIE CAS CSCD 1998年第3期186-191,共6页
Soil samples were taken from different soil depth of different forest soil story in the Natural Reserve of Changbai Mountain, and their saturated conductivity and effective porosity were measured. The variation of sat... Soil samples were taken from different soil depth of different forest soil story in the Natural Reserve of Changbai Mountain, and their saturated conductivity and effective porosity were measured. The variation of saturated conductivity and effective porosity with different soil depth were studied by regressive analysis and a logarithmic model. The results were compared with the exponential model (Beven 1982). The results of comparison showed that the logarithmic model was more accurate and reasonable than the exponential model for forest catchment. 展开更多
关键词 Saturated CONDUCTIVITY effective porosity Logarithmic MODEL
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Sand control effect of HDPE sandbreak nets with different porosity structure 被引量:1
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作者 QingHe Niu JianJun Qu +1 位作者 AiGuo Zhao LiHai Tan 《Research in Cold and Arid Regions》 CSCD 2022年第6期403-411,共9页
Straw checkerboard sand barriers with a porous structure that consists of a pervious upper portion and a dense lower portion are widely used to achieve great sand control effect.Considering this,and resolving the seri... Straw checkerboard sand barriers with a porous structure that consists of a pervious upper portion and a dense lower portion are widely used to achieve great sand control effect.Considering this,and resolving the serious earth surface undercutting problem after HDPE sandbreak net checkboard barriers setting,the authors used HDPE(high-density polyethylene)materials to prepare new sandbreak materials with a similar porous structure.Through wind tunnel simulations and field sand control monitoring,we compared the sand control effect of three HDPE sandbreak nets with different porosity structure.Compared to the sandbreak net with uniform porosity structure,the three types of HDPE sandbreak nets with different porosity structure had poorer effect on reducing sand transport rates,but had longer effective protection distance before sandbreak nets at low wind velocity conditions(<12 m/s),longer effective protection distance at high wind velocity(>14 m/s)and longer effective protection distance between sandbreak nets at all experimental wind velocity conditions.Wind and sand control effect characteristics of HDPE sandbreak nets with different porosity structure provide an ideal material on semiburied checkerboard sand barriers for sand stabilization.By contrast,uniform-type sandbreak nets are used as materials on high upright sand fences for sand blocking.These HDPE sandbreak nets can be used to replace traditional sandbreak materials and have a very high potential for widespread and popular application in aeolian sand disaster control. 展开更多
关键词 HDPE sandbreak nets Different porosity structure Checkerboard sand barriers High upright sand fence Sand control effect
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Effects of Solid Matrix and Porosity of Porous Medium on Heat Transfer of Marangoni Boundary Layer Flow Saturated with Power-Law Nanofluids
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作者 陈晖 肖天丽 +1 位作者 陈嘉阳 沈明 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第10期80-84,共5页
The effect of the solid matrix and porosity of the porous medium are first introduced to the study of power-law nanofluids, and the Marangoni boundary layer flow with heat generation is investigated. Two cases of soli... The effect of the solid matrix and porosity of the porous medium are first introduced to the study of power-law nanofluids, and the Marangoni boundary layer flow with heat generation is investigated. Two cases of solid matrix of porous medium including glass balls and aluminum foam are considered. The governing partial differential equations are simplified by dimensionless variables and similarity transformations, and are solved numerically by using a shooting method with the fourth-fifth-order Runge-Kutta integration technique. It is indicated that the increase of the porosity leads to the enhancement of heat transfer in the surface of the Marangoni boundary layer flow. 展开更多
关键词 of is as effects of Solid Matrix and porosity of Porous Medium on Heat Transfer of Marangoni Boundary Layer Flow Saturated with Power-Law Nanofluids in with on
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Diagenesis of the Triassic Yanchang Formation Tight Sandstone Reservoir in the Xifeng–Ansai Area of Ordos Basin and its Porosity Evolution 被引量:11
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作者 LIU Mingjie LIU Zhen +1 位作者 WANG Peng PAN Gaofeng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第3期956-970,共15页
This work aims to reveal the evolution of the porosity in the Triassic Yanchang Formation tight sandstone reservoir of the Xifeng-Ansai area of Ordos Basin. Based on destructive diagenesis (compaction and cementation... This work aims to reveal the evolution of the porosity in the Triassic Yanchang Formation tight sandstone reservoir of the Xifeng-Ansai area of Ordos Basin. Based on destructive diagenesis (compaction and cementation) and constructive diagenesis (dissolution) of sandstone reservoirs, this study analyzed the diagenesis characteristics of the tight sandstone reservoirs in this area, and discussed the relationship between sandstone diagenesis and porosity evolution in combination with present porosity profile characteristics of sandstone reservoir. The effect simulation principle was employed for the mathematical derivation and simulation of the evolution of porosity in the Yanchang Formation tight sandstone reservoirs. The result shows that compaction always occurs in tight sandstone reservoirs in the Yanchang Formation, and cementation occurs when the burial depth increases to a certain value and remains ever since. Dissolution occurs only at a certain stage of the evolution with window features. In the corresponding present porosity profile, diagenesis is characterized by segmentation. From the shallow to the deep, compaction, compaction, cementation and dissolution, compaction and cementation occur successively. Therefore, the evolution of sandstone porosity can be divided into normal compaction section, acidification and incremental porosity section, and normal compaction section after dissolution. The results show that the evolution of sandstone porosity can be decomposed into porosity reduction model and porosity increase model. The superposition of the two models at the same depth in the three stages or in the same geological time can constitute the evolution simulation of the total porosity in sandstone reservoirs. By simulating the evolution of sandstone reservoir porosity of the eighth member in Xifeng area and the sixth member in Ansai area, it shows that they are similar in the evolution process and trend. The difference is caused by the regional uplift or subsidence and burial depth. 展开更多
关键词 tight sandstone DIAGENESIS porosity evolution effect simulation Yanchang Formation Ordos Basin
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Stress dependent permeability and porosity of low-permeability rock 被引量:7
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作者 JIA Chao-jun XU Wei-ya +3 位作者 WANG Huan-ling WANG Ru-bin YU Jun YAN Long 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第10期2396-2405,共10页
The seepage property of low-permeability rock is of significant importance for the design and safety analysis of underground cavities. By using a self-developed test system, both permeability and porosity of granite f... The seepage property of low-permeability rock is of significant importance for the design and safety analysis of underground cavities. By using a self-developed test system, both permeability and porosity of granite from an underground oil storage depot were measured. In order to study the influence of rock types on permeability, a tight sandstone was selected as a contrast. The experimental results suggested that the porosity of this granite is less than 5% and permeability is low to 10–20 m^2 within the range of effective stress. During the loading process, both exponential relationship and power law can be utilized to describe the relationship between effective stress and permeability. However, power law matches the experimental data better during the unloading condition. The stress dependent porosity of granite during loading process can be described via an exponential relationship while the match between the model and experimental data can be improved by a power law in unloading paths. The correlation of permeability and porosity can be described in a power law form. Besides, granite shows great different evolution rules in permeability and porosity from sandstone. It is inferred that this difference can be attributed to the preparing of samples and different movements of microstructures subjected to effective stress. 展开更多
关键词 PERMEABILITY porosity effective STRESS STEADY-STATE METHOD TRANSIENT pulse METHOD low-permeability
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Integrated petrophysical log characterization for tight carbonate reservoir effectiveness: A case study from the Longgang area, Sichuan Basin, China 被引量:3
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作者 Deng Shaogui Wang Yang +2 位作者 Hu Yunyun Ge Xinmin He Xuquan 《Petroleum Science》 SCIE CAS CSCD 2013年第3期336-346,共11页
Ultra-low porosity and permeability, inhomogeneous fracture distribution, and complex storage space together make the effectiveness evaluation of tight carbonate reservoirs difficult. Aiming at the carbonate reservoir... Ultra-low porosity and permeability, inhomogeneous fracture distribution, and complex storage space together make the effectiveness evaluation of tight carbonate reservoirs difficult. Aiming at the carbonate reservoirs of the Da'anzhai Formation in the Longgang area of the Sichuan Basin, based on petrophysical experiments and logging response characteristics, we investigated the storage properties of matrix pores and the characteristics of fracture development to establish a method for the characterization of effectiveness of tight reservoirs. Mercury injection and nuclear magnetic resonance (NMR) experiments show that the conventional relationship between porosity and permeability cannot fully reflect the fluid flow behavior in tight matrix pores. Under reservoir conditions, the tight reservoirs still possess certain storage space and permeability, which are controlled by the characteristic structures of the matrix porosity. The degree of fracture development is crucial to the productivity and quality of tight reservoirs. By combining the fracture development similarity of the same type of reservoirs and the fracture development heterogeneity in the same block, a three-level classification method of fracture development was established on the basis of fracture porosity distribution and its cumulative features. According to the actual production data, based on the effectiveness analysis of the matrix pores and fast inversion of fracture parameters from dual laterolog data, we divided the effective reservoirs into three classes: Class I with developed fractures and pores, and high-intermediate productivity; Class II with moderately developed fractures and pores or of fractured type, and intermediate-low productivity; Class III with poorly developed fractures and matrix pores, and extremely low productivity. Accordingly log classification standards were set up. Production data shows that the classification of effective reservoirs is highly consistent with the reservoir productivity level, providing a new approach for the effectiveness evaluation of tight reservoirs. 展开更多
关键词 Matrix porosity fracture porosity reservoir effectiveness reservoir classification petrophysical log characterization
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Influence of Absolute Basicity and Capillary Porosity on Carbonation of Concrete 被引量:2
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作者 巴明芳 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第5期889-892,共4页
The single influence of capillary porosity and coupling effects of absolute basicity and capillary porosity on concrete carbonation were investigated. The experimental results showed that carbonation rate of concrete ... The single influence of capillary porosity and coupling effects of absolute basicity and capillary porosity on concrete carbonation were investigated. The experimental results showed that carbonation rate of concrete at a given absolute basicity (AB) increased moderately with the increase of the porosity ranging from 6.2% to 9.25%, and increased rapidly with porosity from 9.25% to 12.8%.The coupling effect mainly embodied in disappeared mutation point of capillary porosity, and the distributing regions of carbonation depth were clearly partitioned in the coupling influence of absolute basicity and capillary porosity. A design method on carbonation related durability of concrete based on the coupling effects was proposed. 展开更多
关键词 absolute basicity capillary porosity coupling effects carbonation rate
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The primary controlling parameters of porosity, permeability,and seepage capability of tight gas reservoirs:a case study on Upper Paleozoic Formation in the eastern Ordos Basin,Northern China 被引量:5
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作者 Hong-Jun Qu Bo Yang +4 位作者 Xia-He Tian Xin-She Liu Huan Yang Wen-Wu Dong Ya-Hui Chen 《Petroleum Science》 SCIE CAS CSCD 2019年第6期1270-1284,共15页
Tight sandstone gas(hereafter"tight gas")has become a subject of unconventional gas exploration globally.The large-scale development and use of tight gas resources in the USA,in particular,facilitated the ra... Tight sandstone gas(hereafter"tight gas")has become a subject of unconventional gas exploration globally.The large-scale development and use of tight gas resources in the USA,in particular,facilitated the rapid rebound of natural gas production in the USA,in addition to driving the rapid development of tight gas worldwide.In the eastern Ordos Basin,the Upper Paleozoic feature includes multiple layers of gas,a shallow depth,and notable potential for exploration and development.However,the reservoirs in the area are relatively tight,exhibit strong heterogeneity,and possess a complex micropore structure,thus restricting the eff ective economic development of oil and gas.Thus,research on the primary parameters controlling pore throat structure and the seepage capability of low-permeability reservoirs will be beneficial for the effcient exploration and development of natural gas in the eastern Ordos Basin.The parameters of reservoir porosity and percolation ability,as well as permeability,were analyzed using systematic sampling of the of the Upper Paleozoic Benxi,Taiyuan,and Shanxi Formations in the eastern Ordos Basin,constant-rate mercury injection experiments,nuclear magnetic resonance analysis,and gas–water-phase experimental studies.The results indicate that reservoir porosity is controlled by the effective pore volume and number,whereas permeability is controlled by the largest throat radius,rather than the average.The effective pore volume controls the movable fluid saturation,while reservoir percolation capability is controlled by the effective pore volume,irreducible water saturation,and size of the gas–water two-phase seepage zone. 展开更多
关键词 porosity and permeability Largest throat radius Movable fluid saturation effective pore throat volume The range of gas–water two-phase seepage zone
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Cranny density parameters and porosity measured by elastic wave method in quasi-isotropic cranny rock masses 被引量:1
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作者 王宏图 贾剑青 +2 位作者 李晓红 鲜学福 胡国忠 《Journal of Central South University of Technology》 EI 2006年第5期598-602,共5页
According to the characteristic of elastic waves propagation in medium and the application of elastic waves method in rock mass engineering, the cranny mass with random crannies was regarded as quasi-isotropic cranny ... According to the characteristic of elastic waves propagation in medium and the application of elastic waves method in rock mass engineering, the cranny mass with random crannies was regarded as quasi-isotropic cranny mass. In accordance with the rock rupture mechanics, principle of energy balance and Castiglano's theorem, the relationship of effective dynamic parameters of elasticity (E, v, G) and cranny density parameters or porosity was put forward. On this basis, through the theory of elastic waves propagation in isotropic medium, the relationship between the elastic wave velocity and cranny density parameters and porosity was set up. The theoretical research results show that, in this kind of cranny rock masses, there is nonlinear relationships between the effective dynamic parameters of elasticity and wave velocities and the cranny density parameter or porosity; and with the increase of cranny density parameter or porosity of cranny rock masses, the effective dynamic modulus and the elastic wave velocities of cranny rock masses will decrease; and at the same time, when the cranny density parameter or porosity is very small, the effective dynamic modulus of elasticity and the elastic wave velocities change with the cranny density parameter, which can explain the sensitivity of effective elastic parameters and elastic wave velocities to cranny rock masses. 展开更多
关键词 quasi-isotropic cranny mass wave velocities effective dynamic parameter cranny density parameter porosity
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Wave Loading on Concentric Porous Cylinders with Varying Porosity 被引量:2
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作者 刘恒序 段文洋 陈晓波 《Journal of Marine Science and Application》 2013年第4期400-405,共6页
Wave diffraction of two concentric porous cylinders with varying porosity was studied by using an analytical method based on eigenfunction matching.The fluid domain around the cylinders is divided into three sub-domai... Wave diffraction of two concentric porous cylinders with varying porosity was studied by using an analytical method based on eigenfunction matching.The fluid domain around the cylinders is divided into three sub-domains and in each sub-domain an eigenfunction expansion of the velocity potential is obtained by satisfying the Laplace equation,the boundary conditions on the free surface and on the sea bed.The unknown coefficients of eigenfunction expansions are determined by boundary conditions on the porous hulls.In the paper,the boundary conditions are based upon the assumption that the flow in the porous medium is governed by Darcy's law.Two porous-effect parameters applied on two porous cylinders are functions of the vertical coordinate instead of the constant.Wave loading on the outer and inner cylinder is presented in the numerical results. 展开更多
关键词 CONCENTRIC POROUS cylinders WAVE loading diffraction EIGENFUNCTION VARYING porosity porous-effect parameter WAVE force
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Evaluation of effective carrier system and function on hydrocarbon accumulation in Gaoyou Sag,Subei Basin,China
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作者 李浩 高先志 +2 位作者 孟晓燕 赵赟龙 张明 《Journal of Central South University》 SCIE EI CAS 2013年第6期1679-1692,共14页
Effective carrier system comprises carrier beds which transport hydrocarbons. The spatial and temporal effectiveness of carrier system is identified according to the relevance of hydrocarbon show, hydrocarbon inclusio... Effective carrier system comprises carrier beds which transport hydrocarbons. The spatial and temporal effectiveness of carrier system is identified according to the relevance of hydrocarbon show, hydrocarbon inclusion and sealing ability of fault to hydrocarbons distribution, together with matching relation of activity history of fault and hydrocarbon generation history of source rock. On the basis of the above considerations, transporting ability of effective carrier system can be evaluated using parameters such as fluid potential, porosity and permeability, spatial coefficient of effective pathway as well as activity rate of fault. Additionally, a new concept of"transporting threshold porosity" was proposed. Five styles of effective carrier systems were established in Gaoyou Sag, displaying either layered or zonal distribution characteristics, and transporting time ranges from the sedimentary time of Ezdz to early stage of sanduo uplift. Effective carrier systems can be described to be lowly-efficient and highly-efficient. Major faults (convex or steep fault plane) with activity rate greater than 20 m/Ma and structure ridges of sand layers with spatial coefficient of effective pathway greater than 25% are defined to be highly-efficient carrier beds. Hydrocarbons are concentrated around high-efficient carrier beds and E1 f traps of northern shanian area are predicted to have great potential. 展开更多
关键词 effective carrier system transporting threshold porosity of carrier beds fluid potential hydrocarbon migration GaoyouSag
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各向异性层状千枚岩渗透率及有效孔隙率试验研究 被引量:1
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作者 王伟 陈超维 +3 位作者 刘世藩 曹亚军 段雪雷 聂文俊 《岩土工程学报》 EI CAS CSCD 北大核心 2024年第2期445-451,共7页
采用岩石全自动三轴伺服仪和气体渗透装置,对一种致密的各向异性层状千枚岩开展了气体渗透率及有效孔隙率试验,研究常规三轴压缩和围压循环加卸载2种应力路径下,气体渗透率、有效孔隙率随层理倾角及偏应力的演化规律。结果表明:围压相同... 采用岩石全自动三轴伺服仪和气体渗透装置,对一种致密的各向异性层状千枚岩开展了气体渗透率及有效孔隙率试验,研究常规三轴压缩和围压循环加卸载2种应力路径下,气体渗透率、有效孔隙率随层理倾角及偏应力的演化规律。结果表明:围压相同时,岩样的初始气体渗透率k0随着层理倾角β的增大呈“W”型变化,在β=45°时取最大值;在围压循环加卸载过程中,气体渗透率先随围压的加载而减小,后随围压的卸载而增大,卸载时的气体渗透率小于加载时的渗透率;层状千枚岩有效孔隙率和气体渗透率呈指数关系;平行于层理方向的气体渗透率远大于垂直于层理方向的气体渗透率;岩样有效孔隙率和气体渗透率随偏应力变化经历初始压密阶段、线弹性阶段和塑性变形阶段,随着偏应力的增大,岩样有效孔隙率和气体渗透率先减小,接着保持稳定,最后快速增大,并在岩样应力-应变曲线斜率接近于0时达到最大值。 展开更多
关键词 层状岩石 各向异性 气体渗透率 有效孔隙率 常规三轴压缩 围压循环加卸载
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松辽盆地北部基岩储层有效性评价技术
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作者 高涛 王春燕 +2 位作者 王海燕 金雪英 覃豪 《特种油气藏》 CAS CSCD 北大核心 2024年第2期57-65,共9页
针对松辽盆地北部基岩岩性复杂、储层致密、裂缝发育以及储层参数计算精度低、储层有效性评价难等问题,提出“原岩+成分+结构”的三维岩性识别新方法;利用声波-密度交会图计算斜率M,利用中子-密度交会图计算斜率N,建立了基于M、N的变骨... 针对松辽盆地北部基岩岩性复杂、储层致密、裂缝发育以及储层参数计算精度低、储层有效性评价难等问题,提出“原岩+成分+结构”的三维岩性识别新方法;利用声波-密度交会图计算斜率M,利用中子-密度交会图计算斜率N,建立了基于M、N的变骨架密度有效孔隙度模型;通过研究基岩导电机理,校正裂缝附加导电性,建立了含裂缝储层含气饱和度模型;综合考虑有效孔隙度、次生孔隙度及裂缝发育程度,确定了基岩储层有效厚度标准及有效储层分类标准。应用结果表明:该套技术岩性解释符合率可达87.5%,气层识别符合率达88.5%,孔隙度、饱和度计算精度满足储量规范要求。研究结果可为松辽盆地北部基岩储层地质勘探及储量评价提供技术保障。 展开更多
关键词 基岩储层 储层有效性评价 岩性识别 有效孔隙度 含气饱和度 储层分类 松辽盆地
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胜利油区储层测井评价技术发展及展望
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作者 耿斌 周德志 +4 位作者 王敏 王永刚 王善江 孟蕾 张园园 《油气地质与采收率》 CAS CSCD 北大核心 2024年第4期184-195,共12页
胜利油区油气资源丰富,储层类型众多,测井评价在勘探开发工作中发挥了重要的作用。值此建院60周年之际,系统回顾储层测井评价技术发展历程和特色技术,总结经验,展望未来,对于测井专业领域的发展和应用有着积极的意义。根据储层特点和评... 胜利油区油气资源丰富,储层类型众多,测井评价在勘探开发工作中发挥了重要的作用。值此建院60周年之际,系统回顾储层测井评价技术发展历程和特色技术,总结经验,展望未来,对于测井专业领域的发展和应用有着积极的意义。根据储层特点和评价难点,系统梳理了常规砂岩、复杂类型和非常规3种类型储层中形成的系列成熟测井评价技术。常规砂岩储层,系统地形成了适用性强的油层标准确定方法,创新了多层合试条件下的岩性、含油性下限约束的电性标准建立方法,开创性地提出了依据不同成岩带划分的储层参数解释技术;复杂类型储层,先后形成了陡坡带砂砾岩岩性测井识别、低渗透砂岩储层有效性评价、低电阻率油层识别及评价等技术;非常规储层,以评价储集性和含油性为主要目的,初步形成了基于二维核磁共振实验的储层参数测井评价技术。这些不同类型储层测井评价技术,都体现了井筒资料与地质认识的结合、岩石物理与测井模型的综合,展现了测井为地质、为油藏服务的能力,并取得了良好的应用效果。展望未来,剩余资源主要分布在隐蔽油气藏及深层,为满足勘探开发的发展和需求,有必要加强实验资料、气测录井和测试生产资料的分析,加强测井评价与地质结合,加强随钻测井、成像、核磁等测井新技术的应用,开展综合研究与评价,从评价目标上拓展产层性质评价和产量预测,从研究手段上,在常规技术的基础上,充分依托专家经验做好样本选取,深化大数据人工智能应用,一定会取得良好效果。 展开更多
关键词 测井评价 储层 孔隙度 饱和度 有效厚度 页岩油
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东营凹陷利津北带砂砾岩体储层测井评价
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作者 贺东旭 陈志湘 +1 位作者 张城浩 朱孟高 《油气地质与采收率》 CAS CSCD 北大核心 2024年第2期48-57,共10页
东营凹陷利津北带砂砾岩体储层矿物组分复杂,物性参数解释精度低,油、干层界限难以界定。基于测井、录井、试采、分析化验等资料,采用交会图版识别和雷达图形模式识别岩性方法,较好地区分了砂砾岩体岩性。在岩性识别、含油产状分析、试... 东营凹陷利津北带砂砾岩体储层矿物组分复杂,物性参数解释精度低,油、干层界限难以界定。基于测井、录井、试采、分析化验等资料,采用交会图版识别和雷达图形模式识别岩性方法,较好地区分了砂砾岩体岩性。在岩性识别、含油产状分析、试采资料分析基础上,分别建立了砾岩类和碳酸盐岩类有效储层的物性和电性下限。结合试采资料,建立了利津北带砂砾岩体有效储层分级解释图版与评价标准。分别建立了砾岩类和碳酸盐岩类储层孔隙度和渗透率参数模型,为利津北带复杂砂砾岩体储层提供定量评价方法。该研究成果在利津北带砂砾岩体投产井中得到了应用验证,效果良好。 展开更多
关键词 砂砾岩体 交会图 雷达图 有效储层 孔隙度 渗透率 定量评价
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基于实验的碳酸盐岩气藏储量计算——以X气藏为例
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作者 杨学峰 闫伟林 +1 位作者 周聪 殷树军 《天然气勘探与开发》 2024年第3期12-22,共11页
四川盆地X气藏为碳酸盐岩储层,储层层间及层内都具有较强的非均质性,是气藏储量计算面临的困难之一。针对此问题,本文采用实验方法支撑储量计算,首先通过实验测量得到气藏各小层岩心的孔隙度、渗透率等基础物性参数,将小层渗透率校正为... 四川盆地X气藏为碳酸盐岩储层,储层层间及层内都具有较强的非均质性,是气藏储量计算面临的困难之一。针对此问题,本文采用实验方法支撑储量计算,首先通过实验测量得到气藏各小层岩心的孔隙度、渗透率等基础物性参数,将小层渗透率校正为克氏渗透率,并根据物性差异将储层分类为孔隙型储层、孔隙-孔洞型储层,再通过产能模拟实验计算得到气藏工业产能对应的有效储层孔隙度和渗透率等储层物性下限。继而通过液膜厚度实验测得各目标储层的液膜厚度,并结合压汞实验测得的孔径分布曲线,得到有效储层中含烃孔隙体积比例,最后通过地质储量计算公式得到气藏储量。研究结果表明:①利用基础物性测试实验、产能模拟实验、水膜厚度实验等实验方法,确定储层物性下限以及有效孔隙体积比例,为气藏储量计算奠定基础,X气藏有效储层孔隙度下限为1.21%~1.56%;②气藏有效储层中含烃孔隙体积比例范围在42.62%~67.73%,通过地质储量计算公式可得到该气藏的有效储量;③该方法对于非均质性较强的碳酸盐岩储层气藏的储量确定具有理论意义和现场指导意义。 展开更多
关键词 碳酸盐岩 强非均质性 产能模拟实验 液膜厚度实验 孔隙度下限 渗透率下限 有效储层
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透水混凝土的配合比设计及性能研究 被引量:1
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作者 张祥驰 袁文华 +1 位作者 方敏 孙克龙 《混凝土与水泥制品》 2024年第8期116-119,共4页
通过L_(9)(3^(4))正交试验研究了骨料级配(m_(4.75~9.50 mm)∶m_(9.50~16.00 mm))=7∶3、6∶4、5∶5)、骨胶比(3.0、3.1、3.2)、粉煤灰掺量(10%、15%、20%)、增强剂掺量(4%、5%、6%)对透水混凝土抗压强度、劈裂抗拉强度、有效孔隙率和... 通过L_(9)(3^(4))正交试验研究了骨料级配(m_(4.75~9.50 mm)∶m_(9.50~16.00 mm))=7∶3、6∶4、5∶5)、骨胶比(3.0、3.1、3.2)、粉煤灰掺量(10%、15%、20%)、增强剂掺量(4%、5%、6%)对透水混凝土抗压强度、劈裂抗拉强度、有效孔隙率和透水系数的影响。结果表明:对于抗压强度和劈裂抗拉强度,最佳的m_(4.75~9.50 mm)∶m_(9.50~16.00 mm)为6∶4、骨胶比为3.1、粉煤灰掺量为20%、增强剂掺量为4%;对于有效孔隙率和透水系数,最佳的m_(4.75~9.50 mm)∶m_(9.50~16.00 mm)为6∶4、骨胶比为3.2、粉煤灰掺量为15%、增强剂掺量为6%。 展开更多
关键词 骨料级配 透水混凝土 强度 有效孔隙率 透水系数
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多孔中药固体片剂孔隙率的太赫兹有效介质模型研究
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作者 李旭 张梦圆 +5 位作者 赵雯玥 左剑 朱卫丰 李哲 施宇蕾 张存林 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2024年第3期344-353,共10页
目前对中药片剂的孔隙测量,一般采用的是具有破坏性的密度测量方法,缺乏无损量化方法。太赫兹辐射能用于无损的提取药物若干光学信息。针对直压型中药片剂,通过太赫兹时域和频域信号处理等不同方法分别计算各种片剂的有效折射率,发现两... 目前对中药片剂的孔隙测量,一般采用的是具有破坏性的密度测量方法,缺乏无损量化方法。太赫兹辐射能用于无损的提取药物若干光学信息。针对直压型中药片剂,通过太赫兹时域和频域信号处理等不同方法分别计算各种片剂的有效折射率,发现两种方法得到的有效折射率和片剂的孔隙率均呈良好的线性关系。根据有效折射率特性,利用四种有效介质模型提取了中药片剂的孔隙率并进行量化回归,通过交叉验证与相对分析误差(RPD)发现通过时域信号处理的有效折射率得到的孔隙率回归模型解释性与验证准确性更高,其中最佳模型是Bruggeman模型(RPD=11.3325)。为中药多孔粉体制剂工艺优化提供支持。 展开更多
关键词 太赫兹光谱 有效折射率 有效介质理论 中药片剂孔隙率
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沁水煤田承压破碎无烟煤气体渗透特性试验研究
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作者 田震 李振 +3 位作者 王登科 张宏图 余奕睿 方智龙 《煤炭工程》 北大核心 2024年第4期177-184,共8页
充分掌握采空区垮落带瓦斯运移规律,对提高煤层气抽采效率具有重要意义。为揭示老空区抽采中后期破碎无烟煤的瓦斯渗透规律,利用自主设计研发的破碎煤岩体压实-渗透试验装置,对0.32~0.63 mm粒径破碎无烟煤开展试验。研究结果表明:以动... 充分掌握采空区垮落带瓦斯运移规律,对提高煤层气抽采效率具有重要意义。为揭示老空区抽采中后期破碎无烟煤的瓦斯渗透规律,利用自主设计研发的破碎煤岩体压实-渗透试验装置,对0.32~0.63 mm粒径破碎无烟煤开展试验。研究结果表明:以动态渗透过程中气体压力及流量的变化趋势为依据,气体在破碎无烟煤中的渗透可划分为两种模式;老空区煤层气抽采中后期低雷诺数下破碎无烟煤中气体运移存在拟启动压力梯度,且空隙率越小所需要的拟启动压力梯度越大;破碎无烟煤渗透率与气体压力呈对数正相关,且随空隙率降低呈指数函数减小;随着轴向应力的增加,破碎无烟煤由弹性变形转化为非弹性变形,此时空隙率对轴向应力的敏感程度降低。 展开更多
关键词 破碎无烟煤 老空区 空隙率 渗透率 滑脱效应 轴向加载
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