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Evaluation of coal structure and permeability with the aid of geophysical logging technology 总被引:1,自引:0,他引:1
Coal structures and the associated permeability were studied by a combined investigation of geophysical logging data and well tests from coal reservoirs of Huainan and Huaibei coalfields in China. A large amount of the site observations on coal sections of mining faces and the macroscopic investigations on textures of drilling coal cores were carried out, providing experimental information for classification of coal structures. Geophysical log was implemented in 600 boreholes for exploration of coal and coalbed methane (CBM) resources, including 10 CBM wells which were used for permeability tests. The permeability tests were conducted by using injection/fall-off method. The results, together with the log data obtained from geophysical log technologies, have been analysed by using geological statistics, permitting correlation of the permeability of coal seams to the log responses. The correlation developed in this study provides better evaluation of coal reservoir permeability, resulting in an improved CBM exploration in the given coalfields. 相似文献
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煤层气储层的测井评价方法研究,一直以来都是研究人员关注的一个重点。总结了煤层气测井技术发展现状、煤储层的特点以及相关的测井响应、储层参数的测井评价方法,指出存在的问题及下一步工作要点。 相似文献
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针对煤层气生产中提高单井产能的需要,提出采用U型水平井进行开发的技术思路,并依据构造简单、煤层厚度大、含气量高、煤体结构完整、水文地质条件简单等标准对U型水平井的部署区域进行了区块优选。对影响该区域U型水平井部署的水平段距离、水平段长度和水平段位置进行了优化研究。结果表明:U型井水平段间距过小,会造成控制地质储量偏小,影响稳产期长短和后期的产气潜力;井距过大,虽然控制储量会相对变大,但是很难形成井间干扰,难以达到面积降压的目的,累产气量也并未增加;从15 a的累产气量来看,最优井距为300 m;最优间距的大小受煤储层割理渗透率的影响明显,随着渗透率增大,最优间距增大;水平段位于煤层中部时日产气量和累产气量较高,推荐水平段位于煤层中部。 相似文献
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Gas adsorption-induced coal swelling is a well-know phenomenon. Coal swelling or shrinkage by adsorption or desorption of water vapor has not been well understood but has significant implications on gas drainage process for underground coal mining and for primary and enhanced coalbed methane production. Decreased matrix moisture content leads to coal shrinkage and thus the change of cleat porosity and permeability under reservoir conditions. Unlike gas adsorption in coal which usually forms a single layer of adsorbed molecules, water vapor adsorption in the coal micropores forms multilayer of adsorbed molecules. In this work, a model has been developed to describe the coal swelling strain with respect to the amount of moisture intake by the coal matrix. The model extended an energy balance approach for gas adsorption-induced coal swelling to water vapor adsorption-induced coal swelling, assuming that only the first layer of adsorbed molecules of the multilayer adsorption changes the surface energy, which thus causes coal to swell. The model is applied to describe the experimental swelling strain data measured on an Australian coal. The results show good agreement between the model and the experimental data. 相似文献
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大庆外围探区油气资源丰富,包括致密油以及致密砂岩气、煤层气等非常规油气资源。煤层具有杨氏模量低、泊松比高、节理发育等特点,对于砂煤互层类低渗透砂岩储层,水力压裂时裂缝容易穿入煤层或沿砂煤界面延伸,造成高停泵、裂缝扭曲、裂缝形态复杂等现象。同时由于煤层动态滤失大,易造成局部过液不过砂,加大施工难度,导致目前施工成功率低。综合分析国内外致密砂岩气及煤层气技术发展现状,开展了砂煤互层压裂工艺技术研究,通过岩石力学测试及应力精确解释,结合现场试验,形成压裂优化设计及现场施工工况诊断、分析控制方法,现场试验效果良好,为非常规储层压裂深入开展研究奠定了基础。 相似文献
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煤储层吸附特征参数是评价煤层气资源和开发潜力的重要参数,煤储层的吸附能力是影响煤层气含量的关键因素之一,也直接影响煤层气井的产能,因此研究煤储层的吸附特征、分析煤储层吸附能力的影响因素对于煤层气的开发具有重要意义。根据等温吸附试验结果,对沁水盆地某区块煤储层的吸附特征进行研究,并探讨煤储层吸附能力的影响因素。结果表明:该区块含气量高,具有较强的吸附能力。煤阶、孔隙率、灰分和煤体结构对煤储层吸附能力有较大影响;孔隙率越大、煤体结构越完整,煤储层吸附能力越强;灰分的增加会降低煤的吸附能力;随煤阶的增加,煤储层吸附能力先增加后减小。 相似文献
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利用水平井技术和大规模水里压裂所引起的页岩气革命已经改变了世界能源供应的格局,我国作为一个能源消耗大国发展页岩气具有重要的作用。由于页岩气开发的特殊性,需要采用一些与常规天然气不同的评价方法。特别是ECS测井的发展,为页岩气开发提供了新的思路。通过测井方法测量地球化学参数,从进行页岩气储层的判别和评估。总结了页岩气开发中国内外常用的测井识别页岩气储层和利用测井资料进行总有机含碳量的估算的方法以及页岩气储层岩性的判定方法。预期了测井资料实现地球化学分析在页岩气开发中的作用。 相似文献
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Effects of matrix moisture on gas diffusion and flow in coal 总被引:1,自引:0,他引:1
Gas production from coal is a complex process whereby gas, initially adsorbed in the coal matrix, desorbs and diffuses through the matrix into the cleat and eventually flows through the cleat system into a production well or a drainage borehole. Hence, the gas production rate is mainly controlled by the gas diffusivity in the matrix and gas permeability in the cleat system. Moisture in the coal matrix has significant impact on gas adsorption capacity and would also play a key role in desorption and migration of gas. However, how moisture affects gas desorption and diffusion in the coal matrix is still poorly understood. In this work, experimental study is performed to investigate effects of moisture on gas sorption rate for an Australian coal. Coal seam gases, CH4 and CO2, are used in the study. The experimental results show that moisture content in the matrix has significant impact on the gas sorption rate and the impact of moisture content on the diffusion rate is stronger for CH4 than CO2. Moreover, the impact of moisture on gas diffusivity in pores with different size is different, suggested from the modelling results using the bidisperse approach. Furthermore, moisture in coal matrix would cause coal swelling/shrinkage and mechanical properties change that could impact on coal permeability under reservoir conditions. Experimental measurements of coal matrix swelling and Young’s modulus on the same coal sample show that matrix moisture content has significant impact on those properties and may have significant implications on coalbed methane recovery and CO2 storage in coal. 相似文献
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煤中会自然形成裂隙,从人类认识到其存在,其历史到至今已经有一百多年了。开发煤层气的实践已经表明了:煤岩的裂缝与渗透率是制约我国煤层气资源开发的关健因素。裂缝性质对煤层气的产出有着很大的影响。煤层是属于裂缝性的储层,它的煤层的渗透率以及其的排液能力,被其裂缝的孔隙度、开度、及间距等所控制着。 相似文献
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临兴地区位于鄂尔多斯盆地东缘河东煤田中部,前期勘探和试井生产显示该区块具有良好的煤层气、页岩气和致密砂岩气资源前景。通过对3种非常规天然气资源勘探和开发地质条件的系统分析,结果表明,临兴地区具有煤层气、页岩气和致密砂岩气优越的成藏条件和良好的配置关系,煤层—页岩—致密砂岩3种储层中天然气连续聚集成藏,受物质基础和保存条件的影响,不同的层位和构造位置上存在差异。提出了该地区非常规天然气的勘探开发可遵循以下原则:东部浅层进行太原组煤层气、页岩气以及山西组煤层气的合探共采,西部深层集中进行山西组页岩气、致密砂岩气以及太原组致密砂岩气的合探共采。从而为该地区非常规天然气的利用提供科学依据。 相似文献
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采用高低温甲烷吸附解吸测试系统,在243.15, 263.15, 283.15, 303.15和323.15 K下用不同变质程度的煤(气肥煤、焦煤、贫煤和无烟煤等)对甲烷进行等温吸附,基于微孔填充Dubinbin?Astakhov(DA)模型对其它环境温度下煤的CH4吸附等温线进行预测. 结果表明,不同变质程度的煤对甲烷的吸附量均随温度降低而增大,且饱和吸附量和特征吸附能与温度具有良好的线性关系. 模型预测的等温吸附曲线与实验结果吻合较好,相对误差不超过5%. 相似文献
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砾岩油藏由于储集层岩石结构复杂、非均质性强、层间差异明显,同时由于油田开发年代跨度大,测井资料在参数和品质上都有较大差异,这些因素导致测井解释难度加大。以取心井岩心测试分析为基础,对年代较新的综合测井系列采用常规解释方法,对年代较早的标准测井系列引入砂层厚度、泥质含量、平均粒径等参数,并参考沉积微相等地质因素,在细分层系的基础上建立孔隙度、渗透率测井解释模型。应用结果表明,该方法建立的解释模型可靠,为水淹层解释及剩余油分布研究提供基础,同时该方法对开发中后期油田老资料的再利用有推广应用意义。 相似文献
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更好发挥现代测井技术在油气勘探中的作用 总被引:1,自引:0,他引:1
现代测井技术的发展经历了模拟测井、数字测井、数控测井和成像测井四个阶段,已在对油气勘探中的数据精确采集、及时高效地发现油气层、识别评价有效储集层、确定油气藏类型等方面发挥了很大作用,指出了加强现代测井技术在油气勘探领域的应用要着重做好的几方面工作。 相似文献
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川西地区侏罗系岩性气藏是目前最主要的勘探开发领域,高精度三维地震勘探是支撑岩性气藏井位部署的关键技术,实时的将地震资料与地面地质条件结合建立探井实施部署系统是勘探工作者长期追求的目标。通过对川西地区侏罗系岩性气藏井位部署方法的长期研究,认为建立地震与地形地物基础数据库、地震资料精细解释与实时应用、GPS的有效应用是高效井位部署的关键技术。研究成果支撑了川西地区探井的部署,对于其他地区的高效井位部署具有重要的参考价值。 相似文献
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安塞油田化子坪地区三叠统延长组长6储层“四性”关系研究 总被引:2,自引:2,他引:0
通过对安塞化子坪地区延长组长6储层测井、录井、岩心和试油等资料的收集、整理、校正、分析,明确了该区储层的岩性、物性、含油性和电性特征及其相互关系。揭示了安塞坪桥地区延长组长6储层四性之间的关系,从而为正确评价储层,开发气田打下基础。 相似文献
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煤层气的勘探对于优化能源结构、保障煤矿安全、减少温室气体排放等具有重要意义。基于煤储层的方位各向异性和双相介质特征,方位AVO、转换横波法和AVO等地震勘探技术能够对煤层气富集区做出有效预测。测井技术具有方法种类多、分辨率高等特点,在煤层气储层识别和储层参数定量解释方面取得了较好的应用效果。开展地震技术和测井技术的综合利用是今后煤层气勘探技术的发展方向。 相似文献