渭北区块煤体结构测井评价及其在射孔段优化中的应用

发布时间：2018-08-09 09:34

【摘要】：鄂尔多斯盆地渭北区块地质历史时期受多期构造运动影响,煤体结构复杂。基于研究区钻井煤心和测井资料,分析不同煤体结构的测井响应特征,并按断裂带与非断裂带建立了研究区5号煤层煤体结构的测井识别图版。结果表明,5号煤层纵向上自下而上煤体结构趋于完整;平面上,北区煤体结构主要为碎裂煤和碎粒煤,南区煤体结构相对较完整,局部发育原生结构煤。结合研究区煤层气压裂、排采数据和5号煤层煤体结构及顶板发育情况,分析不同顶板岩性与不同射开比例下的产气效果。结果显示:顶板岩性为砂岩或泥质砂岩时的碎裂煤和碎粒煤储层产气量高于顶板岩性为泥岩或砂质泥岩的产气量。煤体结构越破碎,则顶板射开比例R越高,若煤层顶板岩性为砂岩或泥质砂岩,需增大顶板射开比例。
[Abstract]:The geological history of Weibei block in Ordos Basin is affected by multiple tectonic movements and the coal structure is complex. Based on the drilling core and logging data in the study area, the logging response characteristics of different coal body structures are analyzed, and the log identification chart of coal body structure of coal seam No. 5 in the study area is established according to the fault zone and non-fault zone. The results show that the structure of coal body from bottom to top tends to be complete in the vertical direction of No. 5 coal seam, and the coal body structure of north district is mainly broken coal and broken coal on the plane, while the coal body structure of southern region is relatively complete, and the primary structure coal is developed locally. Combined with the coalbed methane fracturing, drainage data, coal body structure and roof development of No. 5 coal seam in the study area, the gas production effect under different roof lithology and different ejection ratio is analyzed. The results show that the gas production of clastic coal and granular coal reservoir is higher than that of top slate shale or sandy mudstone when the roof lithology is sandstone or argillaceous sandstone. The more broken the coal body structure, the higher the roof ejection ratio R is. If the coal seam roof lithology is sandstone or argillaceous sandstone, it is necessary to increase the roof ejection ratio.
【作者单位】：中国矿业大学(北京);中石油煤层气有限责任公司;
【分类号】：P618.11;P631.81

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