渝东北寒武系鲁家坪组泥页岩裂缝特征及其页岩气意义  

Fracture characteristics of the mud shale in Cambrian Lujiaping Formation in Northeast Chongqing and their shale gas significance

作　　者：胡明[1,2,3] 张渝苹 陆廷清 胡峰[4] 汪星 冯桂莲 王秉合[6] HU Ming;ZHANG Yuping;LU Tingqing;HU Feng;WANG Xing;FENG Guilian;WANG Binghe(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;MOE Key Laboratory of Tectonics and Petroleum Resources,China University of Geosciences,Wuhan 430074,China;Sichuan Province Key Laboratory of Natural Gas Geology,Chengdu 610500,China;BGP Southwest Geophysical Company,Chengdu 610213,China;No.141 Geological Team of Sichuan Coalfield Geological Bureau,Deyang 61800,China;Exploration and Development Research Institute of Yumen Oilfield Branch,Jiuquan 735019,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [3]天然气地质四川省重点实验室,四川成都610500 [4]东方地球物理公司西南物探分公司,四川成都610213 [5]四川省煤田地质局141地质队,四川德阳61800 [6]玉门油田分公司勘探开发研究院,甘肃酒泉735019

出　　处：《大庆石油地质与开发》2020年第1期136-143,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：教育部重点实验室开放研究基金课题“四川盆地东缘构造特征与页岩气富集之间关系研究”(TPR-2018-07)。

摘　　要：在泥页岩气勘探开发过程中,泥页岩裂缝发育情况是一个很重要的评价指标。在前人研究基础上,结合渝东北地区区域地质概况,收集并统计野外露头裂缝和岩心裂缝数据,探求该地区泥页岩裂缝发育特征,总结裂缝发育规律,分析泥页岩裂缝对页岩气藏含气量的影响。研究表明:研究区寒武系鲁家坪组页岩脆性矿物体积分数均值高达75.9%,其脆性程度较高,有利于储层压裂改造;该区域中、小型裂缝较为发育,约占全部裂缝90%;泥页岩中小型裂缝越发育,压裂过程中形成的天然裂缝网格面积越大,页岩含气量越大,而大型裂缝结论相反。运用该结论最终优选出城页1井页岩含气量高井段1 362~1 456 m。In the process of the exploration and development of the mud shale gas, the development of the shale fracture is one of the important evaluating indexes. On the basis of the previous studies, combined with the regional geological survey in Northeast Chongqing, the data of the outcrop fractures and core fractures were collected and summarized, and moreover counted to explore the characteristics of the shale fracture development in this area and summarize the law of the fracture development and analyze the influences of the mud shale fractures on the gas content of the shale gas reservoir. The study shows that the average content of the brittle minerals in Cambrian Lujiaping Formation shale in the study area is as high as 75.9%, the brittleness of the shale is relatively higher, which is conducive to reservoir fracturing;the medium and small cracks are well-developed too in this area, accounting for about 90% of all cracks;the more well developed the small and medium-sized fractures in the mud shale, the larger the mesh area of the natural fracture formed in the process of fracturing and the larger the gas production of the shale, but for the large fractures, the conclusion is just on the contrary. With the help of this conclusion, 1 362-1 456 m shale interval with high gas production in Well Chengye-1 was optimized.

关 键 词：泥页岩 裂缝 寒武系 渝东北 鲁家坪组 

分 类 号：TE122[石油与天然气工程—油气勘探]