海陆过渡相煤系含气层测井响应特征分析  

Logging Response Features of Gas-bear ing Reservoirs in Marine-continenta Transitional Facies Coal Measure

作　　者：尹帅[1] 丁文龙[1] 刘建军 曹翔宇[1] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石油华北油田公司勘探开发研究院,河北任丘062552

出　　处：《天然气技术与经济》2016年第6期12-15,共4页Natural Gas Technology and Economy

基　　金：国家自然科学基金项目(41372139;41072098);国家科技重大专项专题(2011ZX05018-001-002;2011ZX05009-002-205;2011ZX05033-004)

摘　　要：煤系天然气聚集规律复杂,是当前天然气勘探的热点领域。沁水盆地南部上古生界广泛发育海陆过渡相煤系地层,具有致密气勘探潜力,但目前研究程度较低。基于野外露头、地震、气测、常规及特殊测井资料,对该地区煤系含气储层地质结构单元进行了划分。同时,分析了不同类型储层的测井识别方法及含气层的各向异性特征。研究结果表明,该地区煤系地层发育煤岩型、致密砂岩型、砂泥岩互层型、泥页岩型及灰岩型5类储层单元。基于常规及特殊测井,制定了煤系致密气层识别的标准。岩性、地应力及裂缝发育程度对储层各向异性均有显著影响,裂缝发育程度对岩石各向异性的影响要强于地应力。该地区煤岩具有最强的各向异性,其次为砂岩及泥岩,砂泥岩频繁互层型地层的各向异性较小。Featured by complex accumulation laws, unconventional gas in coal measure is the hotspot of gas resource's exploration. In southern Qinshui Basin, the Upper Paleozoic marine-continental transitional facies coal measure is widely developed. Although there is an exploration potential, its research is weak. In this study, based on field survey and data from seismic, and conventional and special well logging, the geological units of gas-bearing reservoirs in the coal measure were divided; meanwhile, the well-logging methods to identity various kinds of reservoirs were analyzed;finally different anisotropic characteristics were gained. Results show that five types of reservoirs are developed in this area, including coal-rock reservoir, tight sandstone reservoir, sandstone interbedded with mudstone reservoir, mudstone reservoir, and limestone reservoir. Furthermore, the standards to identify tight- gas reservoirs in coal measure were also developed on the basis of conventional and special well logging. Lithology, stress, and fracture development have obvious effects on anisotropy, and the effect of fracture development is stronger than that of stress. Comparatively in southern Qinshui Basin, the coal rock has strongest anisotropy, the second for the sandstone and mudstone, and the weak for the sandstone interbedded with mudstone.

关 键 词：沁水盆地 海陆过渡相 煤系 含气层 测井 

分 类 号：P618.13[天文地球—矿床学]