渝东南地区下志留统龙马溪组页岩气成藏地质特征

发布时间：2018-01-06 19:18

本文关键词：渝东南地区下志留统龙马溪组页岩气成藏地质特征　出处：《油气地质与采收率》2017年05期 　论文类型：期刊论文

【摘要】：近年来,渝东南地区页岩气勘探开发成为油气勘探领域的焦点。基于野外实测地层剖面和钻井资料,从页岩地层特征、地球化学特征、储层特征及成藏模式等方面系统分析了渝东南地区龙马溪组页岩气成藏地质特征。结果表明:渝东南地区龙马溪组页岩沉积厚度大,为30~130 m,在石柱—彭水地区形成沉积中心;页岩有机碳含量高,为0.05%~17.4%,在彭水地区形成有机碳含量高值区,有机质类型主要以腐泥质无定性体为主,热演化程度处于高—过成熟阶段。储层矿物成分复杂,粘土矿物包括伊利石、伊/蒙混层和绿泥石,脆性矿物以石英、长石和碳酸盐矿物为主,脆性指数高。储集空间以有机质孔、粒间孔、粒内孔、粘土矿物层间孔及裂缝为主。页岩气成藏方式为原地聚集成藏,生气方式主要为原油裂解生气和有机质热解生气。
[Abstract]:In recent years, shale gas exploration and development in southeastern Chongqing has become the focus of oil and gas exploration field. Based on field measured stratigraphic profiles and drilling data, shale stratigraphic characteristics and geochemical characteristics are analyzed. The geological characteristics of shale gas accumulation in Longmaxi formation in southeastern Chongqing are systematically analyzed in terms of reservoir characteristics and reservoir forming model. The results show that the shale sedimentary thickness of Longmaxi formation in southeastern Chongqing is 30 ~ 130m. Forming sedimentary center in Shizhou-Pengshui area; The content of organic carbon in shale is high, which is 0.05% and 17.4%. In Pengshui area, the organic carbon content is high, and the main organic matter is saprotic mudstone. The thermal evolution is in the high-over-mature stage. The mineral composition of the reservoir is complex. The clay minerals include Illite, Iraq / Mongolia layer and chlorite, and the brittle minerals are mainly quartz, feldspar and carbonate minerals. The main reservoir space is organic matter pore, intergranular pore, intragranular pore, clay mineral interlayer pore and fracture. The main ways of gas generation are crude oil pyrolysis and organic matter pyrolysis.
【作者单位】：复杂油气田勘探开发重庆市重点实验室;重庆科技学院石油与天然气工程学院;重庆市地勘局208水文地质工程地质队;南京大学地球科学与工程学院;重庆地质矿产研究院;
【基金】：重庆科技学院重点培育基金项目“渝东南地区下志留统石牛栏组高频韵律旋回沉积研究”(CK2015Z25);重庆科技学院研究生科技创新项目“渝东南下志留统龙马溪组泥质岩脆性矿物特征研究”(YKJCX1620111) 重庆市基础科学与前沿技术研究项目“渝东南地区志留系石牛栏组韵律旋回成因机制及其对生物群落的制约”(cstc2016jcy A0606) 中国石油科技创新基金项目“基于裂缝变形机理的页岩气藏体积压裂水平井流体流动规律研究”(2015D-5006-0207)
【分类号】：P618.13
【正文快照】： 近年来页岩气已成为中国非常规油气勘探的热点领域[1-3]。渝东南地区具有丰富的页岩气资源,先后在秀山和彭水等地区开展油气钻探工作,多数钻井发现了具有商业价值的页岩气,如秀页1井和渝页1井等。从目前的勘探和开发情况看,渝东南地区下志留统龙马溪组页岩是上扬子地区下古生

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