Rock characterization while drilling and application of roof bolter drilling data for evaluation of ground conditions

Despite recent advances in mine health and safety, roof collapse and instabilities are still the leading causes of injury and fatality in underground mining operations. Improving safety and optimum design of ground support requires good and reliable ground characterization. While many geophysical methods have been developed for ground characterizations, their accuracy is insufficient for customized ground support design of underground workings. The actual measurements on the samples of the roof and wall strata from the exploration boring are reliable but the related holes are far apart, thus unsuitable for design purposes. The best source of information could be the geological back mapping of the roof and walls, but this is disruptive to mining operations, and provided information is only from rock surface.Interpretation of the data obtained from roof bolt drilling can offer a good and reliable source of information that can be used for ground characterization and ground support design and evaluations. This paper offers a brief review of the mine roof characterization methods, followed by introduction and discussion of the roof characterization methods by instrumented roof bolters. A brief overview of the results of the preliminary study and initial testing on an instrumented drill and summary of the suggested improvements are also discussed.

Correlations between various rock mass classification/characterization systems for the Zagros tunnel-W Iran

This study deals with the comparative investigation on various classification/characterization systems for sedimentary rocks in two parts,40 kmlong of the Zagros tunnel,west of Iran.The results of extensive geotechnical explorations and field measurements were applied to obtain the rock mass classification/characterization systems such as Rock Mass Rating(RMR),Rock Condition Rating(RCR),Q-system(Q),Rock Mass Number(QN),Rock Mass index(RMi),Rock Structure Rating(RSR),and Geological Strength Index(GSI)for a wide range of sedimentary rocks.A set of systems inter-relationship is proposed.Some of these correlation relations such as RMR-Q,RMR-RMi,RMi-Q,RCR,GSI-GSI(Cai)are similar to the one or more relations proposed in the previous studies,however,some of them such as RSR-RMR,RSR-Q,RCR-QN and GSI-RMR are not similar to the previous works.Joint set orientation and joint set number are more important parameters that cause weak correlation coefficients where both side classifications are not similar in considering them in calculating values.So it is proposed to find relations between any pairs of systems that both of them consider or not consider these parameters.The relations are proposed for a wide range of sedimentary rocks and can be applied for similar geological environments.

Application of laser scanning for rock mass characterization and discrete fracture network generation in an underground limestone mine

Terrestrial laser scanning(TLS) is a useful technology for rock mass characterization. A laser scanner produces a massive point cloud of a scanned area, such as an exposed rock surface in an underground tunnel,with millimeter precision. The density of the point cloud depends on several parameters from both the TLS operational conditions and the specifications of the project, such as the resolution and the quality of the laser scan, the section of the tunnel, the distance between scanning stations, and the purpose of the scans. One purpose of the scan can be to characterize the rock mass and statistically analyze the discontinuities that compose it for further discontinuous modeling. In these instances, additional data processing and a detailed analysis should be performed on the point cloud to extract the parameters to define a discrete fracture network(DFN) for each discontinuity set. I-site studio is a point cloud processing software that allows users to edit and process laser scans. This software contains a set of geotechnical analysis tools that assist engineers during the structural mapping process, allowing for greater and more representative data regarding the structural information of the rock mass, which may be used for generating DFNs. This paper presents the procedures used during a laser scan for characterizing discontinuities in an underground limestone mine and the results of the scan as applied to the generation of DFNs for further discontinuous modeling.

Rock mass structural recognition from drill monitoring technology in underground mining using discontinuity index and machine learning techniques

A procedure to recognize individual discontinuities in rock mass from measurement while drilling(MWD)technology is developed,using the binary pattern of structural rock characteristics obtained from in-hole images for calibration.Data from two underground operations with different drilling technology and different rock mass characteristics are considered,which generalizes the application of the methodology to different sites and ensures the full operational integration of MWD data analysis.Two approaches are followed for site-specific structural model building:a discontinuity index(DI)built from variations in MWD parameters,and a machine learning(ML)classifier as function of the drilling parameters and their variability.The prediction ability of the models is quantitatively assessed as the rate of recognition of discontinuities observed in borehole logs.Differences between the parameters involved in the models for each site,and differences in their weights,highlight the site-dependence of the resulting models.The ML approach offers better performance than the classical DI,with recognition rates in the range 89%to 96%.However,the simpler DI still yields fairly accurate results,with recognition rates 70%to 90%.These results validate the adaptive MWD-based methodology as an engineering solution to predict rock structural condition in underground mining operations.

Geomechanical characterization of volcanic rocks using empirical systems and data mining techniques

This paper tries to characterize volcanic rocks through the development and application of an empirical geomechanical system. Geotechnical information was collected from the samples from several Atlantic Ocean islands including Madeira, Azores and Canarias archipelagos. An empirical rock classification system termed as the volcanic rock system(VRS) is developed and presented in detail. Results using the VRS are compared with those obtained using the traditional rock mass rating(RMR) system. Data mining(DM) techniques are applied to a database of volcanic rock geomechanical information from the islands.Different algorithms were developed and consequently approaches were followed for predicting rock mass classes using the VRS and RMR classification systems. Finally, some conclusions are drawn with emphasis on the fact that a better performance was achieved using attributes from VRS.

Geochemical Characterization of Intermediate to Silicic Rocks in the Global Ophiolite Record

Ophiolites consist predominantly of mafic-ultramafic rocks but also contain in subordinate amounts intermediate to silicic intrusive–extrusive rocks in them.These rocks,although not in large volumes in comparison to mafic–ultramafic units,reveal significant clues about melt evolution,magmatic accretion processes,and partial melting of pre-existing oceanic crust during ophiolite evolution.They also yield ample accessory minerals,such as zircon and monazite,which are widely used to date the timing of oceanic crust generation.We present a global synthesis of the occurrence of such leucocratic,intrusive and volcanic rocks from 150 Phanerozoic to Archean ophiolites,and evaluate models for their genesis during the development of oceanic crust in different tectonic environments.In the ophiolite complexes we have investigated,intrusive and extrusive rocks show a wide range in composition.Intermediate rocks（with Si O2 between 52and 63 wt.%）include andesite and diorite,whereas the silicic rocks（with Si O2 more than 63 wt.%）include dacite,trondhjemite,tonalite and granite.For subduction-relatedandsubduction-unrelated MORB-type ophiolites in the Phanerozoic orogenic belts,the most commonly reported intermediate to silicic intrusive rocks,independent of their original tectonic setting,are trondhjemite,plagiogranite and tonalite,and less commonly quartz-diorite and diorite.These rock types have been documented from 80 percent of the 104ophiolites included in this study.Intermediate to silicic lavas and/or pyroclastic rocks（basaltic andesite,andesite,dacite and rhyolite）are less abundant,and have been reported from only 35 percent of the 104 ophiolites.Trachyte occurs in some of the Rift/Continental Margintype,subduction-unrelated ophiolitesEvolvedrocksinsubduction-unrelated,Rift/Continental Margin ophiolites are predominantly basaltic andesite and andesite,whereas MOR type（mid-ocean ridge）ophiolites exhibit nearly equal proportions of basaltic andesite/andesite and rhyodacite and Plume/MOR type ophiolites are characterized by rhyolites.Intermediate to silicic volcanic uints in the Backarc sub-group of subduction-related ophiolites are characterized by similar amounts of basaltic andesite/andesite and rhyodacite,whereas in the Backarc to Forearc,Forearc,and Volcanic Arc sub-groups they are mainly basaltic andesite/andesite.Intermediate to silicic rocks in Rift/Continental Margin and Plume/MOR type ophiolites are generally LREE-enriched,whereas those in the MOR type vary from LREE-depleted to LREE-enriched.The Backarc and Backarc to Forearc types are similar to the MOR type;silicic rocks of the Forearc and Volcanic Arc types are generally LREE-enriched.The main process in the formation of the majority of the intermediate to silicic rocks in both subduction-unrelated and subduction-related ophiolites is partial melting of basaltic and/or gabbroic rocks beneath the spreading centers,whereas a minor volume in subduction-related ophiolites are adakites that were produced from partial melting of a subducting slab.Silcic to intermediate rocks in Plume/MOR type ophiolites are generated by fractional crystallization of basaltic melt.The incompatible,non-conservative elements,such as Ba and Th,are weakly to strongly enriched in subduction-related ophiolites as a result of shallow to deep enrichment associated with subduction zone processes.The field occurrence and the geochemical character of leucocratic rocks in ophiolites show considerable variations,providing additional constraints on the petrogenesis of ophiolites in different tectonic settings.Fractional crystallization appears to have been an important process in the formation of the intermediate to silicic rocks in Rift/CM and P/MOR ophiolites in the subduction-unrelated class,as well as VA ophiolites in the subduction-related class.In these types of ophiolites magma chambers might have operated as closed-systems for a sufficient amount of time for fractionation and compositional zoning of the magma to take place（Fig.1C1）.Fractional crystallization was of subordinate importance during the igneous construction of the MOR,BA,FA,and BA-FA ophiolites.Instead,partial melting of hydrothermally altered crust was the most common process resulting in the majority of the intermediate to felsic rocks of the Rift/CM（estimated to 60%）,MOR（estimated to 95%）,and the BA,FA and BA-FA（estimated to 75%）ophiolites,as well as a high proportion of the VA ophiolites（;0%）(Fig.1C2).Slab-generated melts that result in the production of intermediate to silicic rocks of adakitic character represent a relatively small fraction（;5%in Phanerozoic ophiolites）of subduction-related ophiolites（Fig.1C3）.Some adakites are very low in incompatible elements（e.g.,La）,suggesting that these melts were generated from highly depleted MORB.Precambrian ophiolites contain a higher percentage of adakites（ca.35%）,indicating that physical conditions were more favorable for slab melting during the Precambrian than in the Phanerozoic.This phenomenon may have resulted from higher geothermal gradient along relatively shallow-dippingsubductionzonesduringthe Precambrian.

Physico-Chemical and Petrographic Characterization of Carbonated Rocks of Mintom (South-Cameroon) and Their Potential Uses

The characterization of carbonated rocks of Mintom allowed identifying three features (massive limestone, banded limestone and dolomite). Samples taken in these features were subjected to the physico-chemical analyses and to the mechanical tests. The results obtained show a convergence in the mineralogical composition in particular in the calcareous features (smectite, micas and calcite);the dolomite feature being mainly constituted by dolomite associated with the smectite. The chemical composition allows finding contents raised in CaO, in all the samples. However, in the dolomite and the banded limestone, the concentrations in MgO and in SiO2 are also important. The mechanical properties showed a good compression resistance for the massive limestone and the dolomite, the mechanical behavior of the banded limestone being low. The exploitation of these results allows recommending carbonated rocks of Mintom in the production of the clinker, agricultural amendments and in the constructions of the civil engineering.

Reservoir quality of the Late Cretaceous Volador Formation of the Latrobe group,Gippsland Basin,Australia:Implications from integrated analytical techniques

Increasing demand for energy due to the populous Eastern Australia has driven oil and gas industries to find new sources of hydrocarbons as they are the primary energy suppliers.Intensive study has been done on the Volador Formation in the Gippsland Basin by means of core-based petrophysical,sedimentological,and petrographic analyses as well as well log-based interpretation and capillary pressure test.Five wells from Kipper,Basker and Tuna fields with available dataset were investigated in this study:Kipper-1,Basker-1,Basker-2,Basker-5 and Tuna-4.Overall,the formation has good reservoir quality based on the high porosity and permeability values obtained through core and well log petrophysical analyses.The formation made up of mostly moderate to coarse quartz grains that has experienced strong anti-compaction and is poorly cemented.Montmorillonite and illite clays are seen dispersed in the rock formation,with the minority being mixed clays.These clays and diagenetic features including kaolinite cement and quartz overgrowth that can lead to porosity reduction only have insignificant impact on the overall reservoir quality.In addition,capillary pressure data shows that most samples are found in the transition to good reservoir zones(<50%saturation).The results obtained from this study have shown that the Volador Formation in the Gippsland Basin is worth for hydrocarbon exploration.

基于计算机视觉的岩石裂隙识别表征与软件研制

岩石裂隙特征是评判岩体结构及其完整性的核心指标,也是评估岩石工程安全稳定性的重要因素。针对岩石裂隙识别,采用深度学习方法,通过引入混合注意力机制对Unet模型进行了改进,有效提高了岩石裂隙识别的精度。针对交叉岩石裂隙的分离与特征提取,提出了一种基于迹线方向判定的裂隙分离与表征算法,依据裂隙分离的结果形式,采用重合追踪法或断裂追踪法分离交叉裂隙骨架,继而使用微分累加法、方框法、线性回归法求得裂隙的长度、宽度及倾角等几何特征指标。基于提出的算法,研制了一套具有图形用户界面的岩石裂隙图像智能识别与表征软件系统,实现了从深度学习模型参数选择、模型训练、裂隙识别、量化分析到结果可视化的完整功能。最后对岩石裂隙识别与分离表征算法的性能进行了评判,结果表明,改进Unet模型对复杂分布的裂隙识别效果最好,其总体识别性能要优于其他网络;骨架分离算法对常见类型交叉裂隙能够取得预期结果,表征算法对分离裂隙与交叉裂隙的表征精度高,对实际岩石裂隙图像的应用效果较好。研究成果可为基于计算机视觉的岩石工程试验与岩体结构检测技术研发提供参考依据。

基于定向声波扫描的钻孔围岩隐伏溶洞表征与分析方法

复杂地质环境下采用简化的几何体代替真实形态的隐伏溶洞进行数值分析,往往难以反映真实的工程特性,自然形成的溶洞形态在几何方面无明显规律性,导致溶洞形态特征的定量化表征问题一直未被很好的解决,为此,针对复杂地质环境下钻孔围岩隐伏溶洞轮廓的几何形态特征定量化研究中缺少系统性研究问题,提出了基于定向声波扫描的钻孔围岩隐伏溶洞表征与分析方法。首先,在利用钻孔定向声波扫描技术获取基础数据的基础上,构建同一钻孔中不同隐伏溶洞的轮廓坐标化准则。随后,在钻孔围岩隐伏溶洞定量表征方面,分别提出了隐伏溶洞水平方向结构表征方法与垂直方向结构表征方法,实现了隐伏溶洞的全方位定量化表征;在钻孔围岩隐伏溶洞统计分析方面,提出了水平全方位占比指数、远离占比指数和深度占比指数,能够从钻孔角度来统计分析钻孔不同深度、周围不同位置的隐伏溶洞情况。最后,结合实际工程案例进行了综合分析,并与其他方法进行了对比验证,证明了提出的方法能够为岩溶地区地质工程中工程勘察和数值模拟提供更多的定量化数据,是溶洞地区的开发与资源利用技术中的一种全新定量化分析方法,具有广阔的应用前景。

基于线性贝叶斯和改进的典型相关分析法的地震岩石物理反演

岩石物理反演作为一种直观的定量解释手段,是储层表征的一个重要研究课题,其中岩石物理模型是联系储层物性参数与弹性参数的桥梁.传统岩石物理反演往往需要在井位处校准岩石物理模型,而在地下介质复杂时,常规的岩石物理模型难以准确描述二者之间的关系,极大地影响了岩石物理反演的准确性.为降低岩石物理模型校准带来的误差,本文引入改进的典型相关分析(BP-CCA)法来构建储层物性参数与弹性参数之间的统计岩石物理关系,从而获得地下储层物性参数的空间展布信息.此外,该方法采用线性贝叶斯理论从叠前地震数据反演得到纵、横波速度及密度等弹性参数,具有较高的反演精度和计算效率.本文对提出的方法进行了合成数据实验和实际数据应用测试.结果表明,该方法可实现对储层参数的准确刻画,验证了其可靠性.

基于五维地震数据的火山机构刻画及岩相识别——以准噶尔盆地石炭系火山岩为例

五维地震数据可以更好地分析地震波在各向异性介质中传播的旅行时间、速度、振幅、频率和相位等属性随方位角的变化,而且炮检距信息与目标地质体的尺度、地层岩性和流体成分等存在相关性,方位角信息则与地层中的断裂、裂缝等的发育特征相关。为此,提出了基于五维地震资料的火山机构刻画和岩相识别技术。考虑到地下构造在垂直于走向方向的响应更明显的特点,通过构建方位分析窗提取优势方位信息,利用倾角成像增强处理的地震资料预测火山机构,利用倾角及方位角的变化计算相邻道的相似性,提高了地震资料的横向信噪比,明确了火山机构宏观分布范围;通过定义方位时窗,结合地震道反距离加权算法,提取每个方位对断裂最敏感的信息,提高了火山机构刻画精度,得到的火山形态更清晰;再结合核主成分分析(KPCA)融合优势属性预测火山岩有利岩相,精细预测了准噶尔盆地KM1井区的三期火山岩有利区带,为高效勘探、开发该区的火山岩储层奠定了基础。

基于三维数字岩心的油页岩裂解孔隙重构及表征研究

油页岩孔隙结构作为油气渗流的主要通道,高温热解过程中将产生复杂变化,然而其变化规律不明严重制约储集层分类评价和高效开发。因此,开展不同温度及不同有机质含量条件下油页岩热解对孔隙结构影响的研究对于油页岩的有效开发具有重要意义。针对热解前后油页岩孔缝结构变化精细表征难的问题,本文通过编程方法提出了一种基于三维数字岩心重构的裂缝及孔隙结构表征新方法,定量分析了热解过程中样品裂缝宽度、裂缝方向、分形维数及孔隙度等参数的变化规律。研究结果表明:(1)本文所提出的裂缝性数字岩心精细化处理方法结合等位精细化中面提取算法,在准确计算岩石物性参数的基础上可实现对缝宽及裂缝方向分布的精确计算,可达到对裂缝孔隙精细表征的目的;(2)随着热解温度的升高,油页岩样品孔隙度由18.3%升至20.9%,且裂缝宽度不断增大,油页岩样品物性得到持续改善,但当热解进行到一定程度后油页岩孔隙结构变化趋势放缓;(3)相同温度条件下随着有机质含量的升高,热解后油页岩样品孔隙度由12.1%升至29.3%,但4种样品分形维数未随着有机质含量升高呈现出单调递增趋势,表明热解裂缝复杂性除受有机质含量影响外,也受到样品中有机质初始分布的影响。本文可为油页岩热解后孔隙结构精细表征提供新思路。

锚固裂隙岩体冻融损伤测试与表征参量研究综述

寒区冻融循环作用可能导致边坡锚固岩体发生崩塌、滑坡灾害,为深入认识裂隙季节性体积变化对锚固岩体产生的损伤效应,开展锚固岩体的冻融损伤测试与评价研究。通过文献调研综述了裂隙岩体及锚固岩体宏细观损伤测试与表征量研究进展,从破坏性测试与非破坏性测试两个方面系统总结了岩体冻融损伤测试技术特点及适用范围。简要论述了适用于锚固裂隙岩体的损伤测试方法,包括拉拔试验、模型试验等破坏性测试,以及CT、声发射、超声波等非破坏性测试,并指出需注意非破坏性测试时金属材料的特殊响应问题。对岩体冻融损伤特征与表征参量进行了分析,并对锚固岩体冻融损伤测试问题的研究趋势进行了展望。综述成果对锚固裂隙岩体冻融损伤分析与研究具有一定参考意义。

Petro-Geochemistry, Genesis and Economic Aspect of Syenitic and Mafic Rocks in Mindif Complex, Far North Cameroon, Central Africa

Syenitic and mafic rocks in Mindif Complex (Far North of Cameroon) were surveyed and characterized to classify them, understand their formation history, and assess their economic interest. Syenitic bodies (hololeucocratic microsyenites;mesocratic aplitic quartz-syenite;leucocratic porphyritic quartz-biotite syenite, and leucocratic porphyritic biotite-syenite) are silica-oversaturated to silica-saturated, alkaline, and metaluminous. Hololeucocratic microsyenites are structural oriented rocks, cooled in shallow depth from low trace and REE dry residual alkaline melts. Mesocratic aplitic quartz-syenite also crystallized in shallow depth from a much Ba-rich less dry residual melt. Leucocratic porphyritic quartz-biotite and biotite syenitic stocks represent two different rock types cooled from hydrous-rich melts in deep seated environments. The Mindif syenites probably crystallized in crustal source magmas (with important alkali feldspar accumulation) from partial melting of pre-existing igneous protoliths. Medium to coarse-grained-peraluminous granite found at the edge of pink microsyenitic dykes (in contact with granite host), is probably a crystallized product from magmatic mixture between the intrusive syenitic melt and a melt from partial fusion of the granite host rock. Mafic igneous rocks in Mindif are peridotgabbro and gabbro with different characteristics. Peridotgabbro, alkaline, holomelanocratic, medium-grained and ultrabasic, is an REE and incompatible elements depleted rock crystallized in shallow depth from a more evolved mantle source magma with plagioclase accumulation. Tholeiitic gabbro, melanocratic, and also medium-grained, was cooled in shallow depth, from a low-K and slightly LILE-enrichment magma probably originated from partial melting ultradepleted mantle source in sub-duction environment. Syenites and peridotgabbro with their high aluminum content (up to 18.5 wt%) greater than that of many parent rocks of lateritic bauxite in Cameroon, can be good parent rocks for bauxite-rich soils if found in a plateau topography and hot-humid tropical climate. The geochemical features of Mindif syenites are close to that of some syenites mined and used as raw materials in ceramic and glass industries. This similarity shows that these syenites are good for glass and ceramic manufacture.

Geotechnical Investigation and Prediction of Rock Burst, Squeezing with Remediation Design by Numerical Analyses along Headrace Tunnel in Swat Valley, Khyber Pakhtunkhwa, Pakistan

This study illustrates the classification of the rock mass and evaluation of rock squeezing, rock burst potential, deformation modulus along the proposed tunnel alignment of small hydropower in Swat Valley, Khyber Pakhtunkhwa (KP), Pakistan. The field and laboratory studies were conducted to classify the rock mass by using geomechanical classification systems i.e. Rock Mass Rating (RMR), tunneling quality index (Q), Rock Mass Index (RMi). The empirical relations classified the ground as non-squeezing and minor to non-squeezing conditions, respectively. Whereas, other methods depict minor to medium bursting potential along chainage 1+000 to 4+000 m, while results along chainage 2+400 - 2+800 m present medium to high bursting potential. Furthermore, numerical analyses were carried out by RS3 for elastic and plastic conditions in order to assess the total displacement of each section in unsupported and supported conditions. The results gave maximum displacement along chainage 2+400 - 2+800 m (19.2 mm in unsupported and 16mm in supported condition) and minimum displacement along chainage 0+876 - 1+000 m (1.4 mm in unsupported and 1.3 mm in supported condition). Hence, the estimated support by empirical methods has been optimized by using numerical analyses for the stability of rock mass along the tunnel.

Physicochemical and Mineralogical Characterizations of Wastes Coming from Phosphate Ore Processing of Hahotoéand KpogaméMines

In the framework of various phosphates discharges valorization, we have realized physicochemical and mineralogical characterizations of these discharges. We have undertaken the physicochemical and mineralogical characterizations of this waste by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), thermal analysis and Atomic Emission Spectrometry Coupled to an Inductive Plasma Source. The results of these analyze show that phosphate sludge and screen rejects could be used in ceramics, in the manufacture of aggregates, in agriculture and other fields. On the other hand, rich magnetic waste could be used in heterogeneous photocatalysis in waste liquids treatment.

岩体工程力学参数取值方法研究Ⅱ:数值仿真试验

针对复杂节理岩体力学参数确定的瓶颈难题,对复杂节理岩体数值仿真试验开展了深入系统的研究,提出了基于岩体结构面网络计算机模拟的岩体结构定量化表征方法,以及基于拓扑矩阵表达和虚拟节理处理的数值试样快速生成技术,通过在数值流形法中引入断裂力学理论建立了复杂节理岩体受力、变形、破坏、扩展直至贯通的全过程模拟方法,在此基础上构建了节理岩体数值仿真试验平台,为通过仿真试验确定节理岩体的工程力学参数提供了一条新的途径。

缝洞型碳酸盐岩凝析气藏提高采收率关键技术

中国海相碳酸盐岩资源丰富,主要以缝洞型碳酸盐岩油气藏为主,占天然气探明储量的2/3以上。其中塔里木盆地缝洞型碳酸盐岩凝析气藏埋深达4 500~7 000 m,储层非均质性极强、储集渗流介质复杂多样、流体性质复杂、气藏静态描述工作难度非常大,为储量评价、开发方案设计及开发动态分析带来了诸多挑战。为此,为了进一步提高该类型油气藏的采收率,以动态补静态,采用静态与动态紧密结合的方式提高气藏描述精度,并在多年的动静态研究和开发实践基础上,创新形成了缝洞型碳酸盐岩凝析气藏提高采收率关键技术。研究结果表明:①基于地震反演信息、以三维数值试井为核心的沙漠强衰减区高精度缝洞体动静迭代动态描述技术;②缝洞型凝析气藏一井多靶点立体开发提高储量动用技术;③缝洞型凝析气藏气举降压提高采收率技术。结论认为,形成的技术体系较好解决了缝洞体精细描述、提高储量动用、降低废弃压力等开发方面的关键难题,实现了对断裂带及羽状破碎带储层的精细描述与开发关键指标的准确预测,有效井及高效井的部署成功率比规模建产初期提高了26%,为缝洞型碳酸盐岩凝析气藏的科学有效开发提供了有力的技术支撑和经验借鉴。

安第斯构造岩性油藏储层预测技术及应用

安第斯T区块位于奥连特盆地东部斜坡带,主要发育为低幅度构造—岩性复合油藏,具有储层薄、横向变化快和成藏规律复杂的特点,这些特点导致储层油水关系复杂以及井位优选难度大。常规的储层预测技术无法满足开发阶段同时预测储层分布范围和明确储层物性和含油性的生产需求,这对地球物理技术提出了极高的要求,因此亟需开展储层精细预测工作,预测储层展布、物性及含油性情况,为优选有利区带及勘探部署提供技术支撑。