渝东北地区下古生界页岩含气性主控因素分析  

Main controlling factor analysis on gas-bearing property of Lower Paleozoic shale in northeastern Chongqing Region

作　　者：余川[1,2] 程礼军[1,2] 曾春林[1,2] 汪生秀[1,2] 

机构地区：[1]国土资源部页岩气资源勘查重点实验室(重庆地质矿产研究院),重庆400042 [2]油气资源与探测国家重点实验室重庆页岩气研究中心,重庆400042

出　　处：《断块油气田》2014年第3期296-300,共5页Fault-Block Oil & Gas Field

基　　金：国家重点基础研究发展计划(973计划)项目"渝东南地区页岩气资源潜力评价"(2012CB214705-05);全国油气资源战略选区调查与评价国家专项课题"中国重点地区页岩气资源潜力及有利区优选"(2009GYXQ-15-5)

摘　　要：页岩含气性是目前页岩气勘探研究的一个关键问题.以渝东北地区3口页岩气地质参数井实钻资料为依据,对下古生界水井沱组和五峰—龙马溪组2套目的层页岩气生成、聚集及保存的影响因素进行了探讨.研究表明：有机质是影响页岩含气性的根本因素,在很大程度上控制着页岩的生烃及吸附能力;较大的页岩层厚度有利于页岩气的大量生成与充分聚集;埋深决定了页岩层的温压条件,要使页岩气得到有效聚集与保存,就需要达到一个合适的温压匹配状态;大型断裂的发育对于页岩气的保存具有破坏性,构造保存条件可能是控制该区下古生界页岩含气性的关键因素.研究区下古生界富有机质页岩（TOC大于2.00％）连续厚度达到30m以上、埋深在1 000～5 000m、断裂欠发育、保存较好的区域是页岩气的有利富集区,并圈定了下寒武统和下志留统页岩气发育的有利区.The gas-bearing property of shale is a key problem in exploration and study of shale gas at present. On the basis of drilling data from three shale gas geological parameter wells in the northeastern Chongqing Region, this paper discusses the influencing factor of generating, gathering and preserving of shale gas for Lower Paleozoic Shuijingtuo and Wufeng-longmaxi Formation. Study shows that organic matter is the basic factor of influencing gas-bearing property of shale, to a large extent, it dominates hydrocarbon generation and adsorption capacity of shale; sufficient thick shale is in favor of generating and gathering of abundant shale gas; burial depth of shale bed decides its warm-pressing condition, and effective aggregation and preserving of shale gas forms from a appropriate warm-pressing matching condition; large-scale fracture is to the disadvantage of preserving of shale gas, and structure preservation condition may be the key factor of influencing thegas-bearing property of Lower Paleozoic shale. In study area, the continuous thickness of Lower Paleozoic organic-rich shale exceeds 30 m, its burial depth is 1,000-5,000 m and large-scale fracture is less. The areas with good preservation condition are the favorable regions for gathering shale gas. The favorable areas for shale gas development in Lower Cambrian Series and Lower Silurian Series are divided.

关 键 词：页岩 含气性 吸附能力 断裂 保存条件 下古生界 渝东北 

分 类 号：TE122[石油与天然气工程—油气勘探]