构造运动对秭归盆地北缘下古生界页岩气保存的影响  

Impacts from Tectogenesis on Lower Paleozoic Shale Gas Preservation in Northern Zigui Basin

作　　者：陈葛成 吴翔 吴先文 周硕 Chen Gecheng;Wu Xiang;Wu Xianwen;Zhou Shuo(Hubei Coal Geological Exploration Institute, Wuhan, Hubei430061)

机构地区：[1]湖北煤炭地质勘查院

出　　处：《中国煤炭地质》2019年第A01期33-37,共5页Coal Geology of China

基　　金：湖北省自然资源厅项目(EZC-2015-ZX0303/5)

摘　　要：构造运动对页岩气藏的保存起着重要的作用。在学科进展和行业需求的推动下,鄂宜页1井下寒武统牛蹄塘组成功的钻获了页岩气流,但在相距不远且具有较好(相似)页岩气发育条件的BD1钻孔(秭归盆地北缘)中却未见气显。通过对区域构造演化的分析及实地调研,以区内构造样式的几何学、运动学、动力学研究为基础,得出以下结论:页岩气的运移以顺层方向的扩散和渗流为主,如果页岩气层段出露或缺失,页岩气就易于顺层运移而散失;泥页岩横向渗透率一般大于垂向渗透率,侧向扩散是页岩气的基本散失通道;走滑断裂的剪切作用会加速页岩气的散失。The tectogenesis has played an important role in the shale gas reservoir preservation. Promoted by subject progress and professional demand, the well EYY1 has successfully intersected commercial shale gas flow in the lower Cambrian Niutitang Formation. But in the well BD1 not far from above mentioned well in northern Zigui Basin with better (similar) shale gas development condition did not see any shale gas indication. Through regional tectonic evolution analysis and site investigation, on the basis of tectonic pattern geometric, kinematic, dynamic studies have concluded that: the migration of shale gas is mainly bedding pervasion and seepage, if the shale gas sector outcropped or hiatus, shale gas will be bedding migrated and escaped. The transverse permeability of argillutite is generally larger than vertical permeability;lateral pervasion is shale gas basic escaping channel. The shearing action of strike-slip fault will speed up shale gas escaping.

关 键 词：构造运动 页岩气保存 牛蹄塘组 秭归盆地北缘 

分 类 号：P641.4[天文地球—地质矿产勘探] F426.21[天文地球—地质学]