A Comprehensive Appraisal on the Characteristics of Coal-Bed Methane Reservoir in Turpan-Hami Basin

The rich coal-bed methane resources in the Turpan-Hami Basin are mainly located in the Shisanjianfang,Hami,Shanshan,Sha'erhu,Kekeya,Kerjian,Aidinghu inclines and the Dananhu coal-bed methane reservoirs. The big-ger coal-bed reservoirs are sitting at a depth of less than 1500 m. The coalbed methane generation,storage and confin-ing conditions of the Turpan-Hami basin can be indicated by eight key parameters. They are coal-bed thickness,coal rank,missing period,permeability,Langmuir volume,rock covering ability,structural confinement and hydrodynamic sealing environment. These parameters constitute a comprehensive appraisal index system of the coal-bed methane res-ervoir characteristics of the Turpan-Hami basin. In these parameters,the missing period of coal-bed methane is indi-cated by a stratum missing intensity factor. It reflects the relative exposure period of coal series. The results of a fuzzy comprehensive judgment showed that the Shisanjianfang coal-bed methane reservoir has the best prospects for exploita-tion and the Sha'erhu,Shanshan,Hami coal-bed methane reservoirs are next in line.

Application of Seismic Anisotropy Caused by Fissures in Coal Seams to the Detection of Coal-bed Methane Reservoirs

Coal-bed methane is accumulated in micro-fissures and cracks in coal seams. The coal seam is the source terrace and reservoir bed of the coal-bed methane (Qian et al., 1996). Anisotropy of coal seams is caused by the existence of fissures. Based on the theory of S wave splitting: an S wave will be divided into two S waves with nearly orthogonal polarization directions when passing through anisotropic media, i.e. the fast S wave with its direction of propagation parallel to that of the fissure and slow S wave with the direction of propagation perpendicular to that of the fissure.

Accumulation of coal-bed gas in the Wangying-Liujia area of the Fuxin basin

The gas enrichment conditions in the Fuxin basin are compared to those of the Powder River basin.The coal bed depth,the gas content,the individual coal bed layer thickness,and the overall structure thickness of the Powder River basin in the U.S.were examined.The main factors affecting gas enrichment were examined.These factors include the coal-forming environment,the gas sources,the geological structure,the presence of magmatic activity,and the local hydrology.The coal-bed gas enrichment area in the Wangying-Liujia block of the Fuxin basin is then discussed by analogy.A hydrodynamic-force/dike-plugging model based on a magma fractured bed is proposed to explain the gas enrichment in this part of the Fuxin basin.High gas production is predicted in areas having similar conditions.This work will aid future coal-bed gas exploration and development.

A Pilot-scale Demonstration of Reverse Osmosis Unit for Treatment of Coal-bed Methane Co-produced Water and Its Modeling

This study presents the first demonstration project in China for treatment of coal-bed methane(CBM) co-produced water and recycling.The work aims to provide a research and innovation base for solving the pollution problem of CBM extraction water.The reverse osmosis(RO) unit is applied to the treatment of CBM co-produced water.The results indicate that system operation is stable,the removal efficiency of the total dissolved solids(TDS) is as high as 97.98%,and Fe,Mn,and F-are almost completely removed.There is no suspended solids(SS) detected in the treated water.Furthermore,a model for the RO membrane separation process is developed to describe the quantitative relationship between key physical quantities-membrane length,flow velocity,salt concentration,driving pressure and water recovery rate,and the water recovery restriction equation based on mass balance is developed.This model provides a theoretical support for the RO system design and optimization.The TDS in the CBM co-produced water are removed to meet the "drinking water standards" and "groundwater quality standards" of China and can be used as drinking water,irrigation water,and livestock watering.In addition,the cost for treatment of CBM co-produced water is assessed,and the RO technology is an efficient and cost-effective treatment method to remove pollutants.

Research regarding coal-bed wellbore stability based on a discrete element model

Wellbore instability is a key problem restricting efficient production of coal-bed methane. In order to perform thorough and systematic research regarding coal-bed wellbore stability problems, a new discrete element model which fully considers the features of cleat coal-beds is established based on the Kirsch equation. With this model, the safe pipe tripping speed, drilling fluid density window and coal- bed collapse/fracture pressure are determined; in addition, the relationships between pipe tripping speed and pipe size, cleat size, etc. and wellbore stability are analyzed in the coal-bed drilling and pipe tripping processes. The case studies show the following results： the wellbore collapses （collapse pressure： 4.33 MPa） or fractures （fracture pressure： 12.7 MPa） in certain directions as a result of swab or surge pressure when the pipe tripping speed is higher than a certain value; the cleat face size has a great influence on wellbore stability, and if the drilling fluid pressure is too low, the wellbore is prone to collapse when the ratio of the face cleat size to butt cleat size is reduced; however, if the drilling fluid pressure is high enough, the butt cleat size has no influence on the wellbore fracture; the factors influencing coal-bed stability include the movement length, pipe size, borehole size.

Coal-Bed Methane Resource of Mesozoic Basins in Jiamusi Landmass

As a new-replacement of energy resource, coal bed methane is the important gas resource with great strategic significance. There are several number of Mesozoic coal-bearing basins in Jiamusi landmass, eastern Heilongjiang Province. Theresult of the resource assessment revealed that the total resource less than 1 500 m,s depth in the area is about 2 100×108m3. It shows that Jiamusi landmass has great potential of coal-bed gas and is one of the most prospecting districts for developing coal-bed gas in CBM-province Northeast China.

The experiment study on slippage effect of the coal-bed methane transfusion

When the gas flow in the compact porous medium at low speed,it has slippage effect which is caused by the gas molecular collision whit the solidskeleton.Using the gas transfusion slippage effect at researching the coal bed transfusion rule,established the transfusion mathematical model of the coal bed which had considered the slippage effect. Observing the influence of the different toencircle presses,the different hole press and the different actual stress to the coal bed by using the three-axles permeameter.Thus sum- marized the transfusion rule of the coal bed.The experiment indicates that the bigger of the surrounding pressure,the more obvious of the slippage effect.At the same condition of axial pressure and the surrounding pressure,with the increase of the hole pressure,the coal permeability became bigger and then smaller.The coal body effective tress and the permeability curve nearly also has the same change tendency.Thus we can draws the conclusion that the transfusion of the gas in the coal bed generally has the slippage effect.

Dual polarization strategy to enhance CH_(4) uptake in covalent organic frameworks for coal-bed methane purification

The purification of low-grade coal-bed methane is extremely important,but challenging,due to the very similar physical properties of CH_(4)and N2.Herein,we proposed a dual polarization strategy by employing triazine and polyfluoride sites to construct polar pores in COF materials,achieving the efficient separa-tion of CH_(4)from N2.As expected,the dual polarized F-CTF-1 and F-CTF-2 exhibit higher CH_(4)adsorption capacity and CH_(4)/N_(2)selectivity than CTF-1 and CTF-2,respectively.Especially,the CH4 uptake capacity and CH_(4)/N_(2)selectivity of F-CTF-2 is 1.76 and 1.42 times than that of CTF-2.This work not only developed promising COF materials for CH4/N_(2)separation,but also provided important guidance for the separation of other adsorbates with similar properties.

宁夏任家庄煤矿主要可采煤层煤质特征及清洁利用方向

任家庄煤矿位于宁东横城矿区,主要含煤地层为太原组和山西组。在对以往勘探煤质资料进行统计的基础上,系统分析了主要可采三、五、六、九号煤层的水分、硫分、灰分等煤质特征及分布规律,并进行了煤炭洁净程度和气化特征划分。研究表明:三号煤层属较好-中等洁净煤,气化用煤类型主要为水煤浆、干煤粉气化用煤;五号煤层属较好-中等洁净煤,洗选加工后,可作为焦化用煤利用;六号煤层属好-较好洁净煤,洗选加工后,可作为焦化用煤利用;九号煤层属较好-中等洁净煤,气化用煤类型主要为水煤浆、干煤粉气化用煤。

河南省新安煤田郁山井田深部煤层及工程地质特征研究

为新安煤田后期远景规划和下一阶段的勘查工作提供必要的资料,分析了河南省新安煤田郁山井田深部煤层及工程地质特征,研究得出,研究区的可采煤层为二1煤层,属大部分可采煤层,位于二叠系下统山西组下部,煤厚0.00~3.61 m,平均1.47 m,煤层结构简单,煤层的稳定程度为较稳定;研究区内构造中等,煤层顶底板较弱,对矿床开采有一定的影响,工程地质条件属中等,研究区地温梯度一般在1.33~1.99℃/(100 m),全区平均地温梯度值为1.61℃/(100 m),为地温正常区。

铜龙煤矿煤层、煤质特征及工业用途分析

根据铜龙煤矿勘探成果资料显示区范围内含有可采煤层3层(5号、7号及12号),总资源储量为3489万t,3层可采煤层均为较稳定煤层,且构造简单,开采技术条件中等,具有较强的经济开采价值。本文通过收集区域和铜龙煤矿勘探工作中所取得的煤层、煤的物理性质、煤岩特征、煤的化学特征、煤工艺性能等相关地质资料进行综合分析,得出矿区范围的5号、7号及12号均属无烟煤3号(WY3),煤层均属于中高硫煤、中灰煤、特低挥发分煤,适用于动力用煤及民用煤,为今后铜龙煤矿的煤炭资源开发利用和研究提供了基础依据。

上海庙矿区长城六号井田地质特征及可采煤层对比

上海庙矿区长城六号井田位于鄂尔多斯盆地西北缘,蕴藏着丰富的煤炭资源。以上海庙矿区长城六号井田为研究对象,在充分研究井田地质特征的基础上,从可采煤层地质特征、岩性标志层和测井曲线3个方面进行了可采煤层的对比分析。长城六号井田含煤地层主要为石炭-二叠系山西组和太原组,井田可采煤层自上而下划分为1、3^(-1)、3^(-2)、5^(-1)、5^(-2)、9^(-1)、9^(-2)和10号煤层,煤层厚度变化小,结构简单,煤层间距稳定,可进行全区对比。长城六号井田内比较稳定的标志层主要有3层,自上而下分别为K_(0)黏土岩、K_(1)泥质灰岩和K_(2)泥质灰岩。K_(0)黏土岩是1号煤顶部的标志层,全区可靠的标志层;K_(1)泥质灰岩为7号煤直接或间接顶板,同时也是区分山西组和太原组的标志性层,在整个研究区广泛分布;K_(2)泥质灰岩全区均有分布,是9号煤层直接或间接顶板。此外,3号煤顶部砂岩和8号煤顶部砂岩也可作为长城六号井田的辅助对比标志层。井田内1、5和9号煤层的三侧向电阻率曲线、长源距伽马-伽马曲线和自然伽马曲线形态特征变化规律明显,可作为煤层对比的重要依据。可采煤层地质特征、岩性标志层和测井曲线3个角度相互验证,进一步提高了煤层对比的可靠性。

四股泉一号井煤地质特征与采矿环境影响分析

借助四股泉一号井的钻探、地震、煤质化验等地质资料,对该地区煤地质特征进行了系统的研究,对该区煤炭开采可能引起的环境问题进行了分析。研究表明:四股泉一号井主要含煤地层为太原组,该组地层含可采煤层8层,平均总厚度12.89 m,可采厚度2.15 m,含煤系数9%。该区煤层开采大概率会引起地面塌陷等地质灾害,对地下水、土壤、大气、植被存在一定影响。该区煤及矸石中有害元素S、P、F、Pb、Hg含量较高,其淋溶水对土壤及地下水存在影响。在生产过程中,应采取必要的防范措施以减少对环境的影响。

应用Excel VBA编制煤田钻孔综合成果整理程序

煤田钻孔综合成果的整理、统计计算,是柱状图绘制、煤层对比和储量计算的重要基础工作。传统的整理工作虽然已经借助于Excel,但是手动处理耗时耗力。为了提高工作效率和准确率,应用VBA语言开发了一个钻孔综合成果整理程序,并把它应用于贵州省赫章县结构勘查区煤炭勘探项目中。应用证明,该程序比传统的手动处理省时省力,准确度高。

现代水文地质勘察方法在找水中的综合运用

采用遥感、计算机数值模拟、模型预测、群孔抽水试验等现代水文地质勘察方法,对许昌市麦岭水源地进行了勘察,查明了研究区含水层空间分布特征及补、径、排条件,地下水的水化学特征及变化规律,并对当地地下水进行了综合评价。经实例研究,认为水文地质勘探应在继承和发展传统技术的基础上,结合现代科学技术和新的理论方法构建人与自然协调的、良性循环的地下水系统,最终形成完整、系统的现代水文地质勘探体系。

同忻井田采空区积水贮存分布特征及突水预测

本文依据井田范围内采空积水调查资料,探讨了采空积水的贮存分布规律,并采用冒落带及导水裂隙带最大高度的计算方法,预测了未来开采下伏可采煤层造成的漏水灾害区。

贵州省织纳煤田煤质特性分析

通过对织纳煤田勘探工作取得的大量基础性煤质资料进行整理,系统分析了该煤田可采煤层的煤质特征及其变化规律,进一步分析了沉积环境与煤层灰分、硫分的关系,并初步提出该煤田煤的利用方向。

新疆伊南煤田察布查尔勘查区煤质特征分析

通过分析伊南煤田察布查尔勘查区煤田勘探的钻井资料,对勘查区2#和4#主采煤层的物理性质和煤岩特征进行分析研究,发现煤中有机显微组分以镜质组和惰质组为主,显微煤岩类型主要为微镜惰煤;对煤中水分、灰分、挥发分和硫分的含量范围进行了概述。

潘集煤矿外围上石盒子组上部可采煤层发育特征

长期以来,在淮南煤田煤炭勘查中,对上石盒子上部煤层勘查重视程度不够,分析、对比与评价不足,本文以潘集煤矿外围煤炭勘查实践为例,详述了区内上石盒子组上部可采煤层发育特征,评价了上部煤层的可采性、稳定性,估算了各可采煤层的煤炭资源量,旨在为淮南煤田今后的煤炭勘查提供有益的启示。