川渝鄂地区龙马溪组页岩沉积环境及储集特征  

Sedimentary environment and reservoir characteristics of Longmaxi formation shale in Sichuan Chongqing and Hubei area

作　　者：邓鑫 康志宏[1,2] 陈阳阳 彭媛媛 肖海峰[1] 韩慧宇[1] 余旭东[1] 赵晨 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]国土资源部页岩气资源战略评价重点实验室,北京100083 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083 [4]中国石油辽河油田公司辽河工程技术处,辽宁盘锦124010

出　　处：《东北石油大学学报》2018年第2期80-87,116,共9页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2017ZX05009-001);中国地质调查局南方地区构造演化控制页岩气形成与分布调查项目(DD20160183)

摘　　要：根据8条野外油气地质基干剖面调查、测井资料、岩心观察,以及薄片分析、X线衍射和扫描电镜等,分析川渝鄂地区龙马溪组黑色页岩沉积环境、分布规律及储集空间特征。结果表明:早志留世龙马溪组为受古隆起围限的浅海深水沉积的古地理格局,主要为深水陆棚相、浅海陆棚相、潮坪潟湖相沉积环境。优质黑色页岩主要发育于陆棚相,厚度为20~120m,呈北东向展布。龙马溪组页岩段黏土矿物质量分数分布在18.80%~30.19%之间,平均为26.50%,以伊/蒙混层为主,对CH4吸附性强。泥页岩孔隙度分布在0.47%~16.50%之间,平均为4.57%,渗透率为(0.004~0.917)×10^(-3)μm^2,页岩储集空间主要包括微孔隙和微裂缝2种类型,有机质孔最为发育,与含气量呈正相关关系。该结果为川渝鄂地区页岩气勘探和开发提供依据。Based on the study of shale by outcrop investigation,logging data,core observation,slice analysis,X-ray diffraction and SEM experiment in Sichuan Chongqing and Hubei areas.A comprehensive analysis of sedimentary environment,distribution regularity,reservoir space characteristics are conducted.The results show that the early Silurian Longmaxi period is confined by the paleo uplift which formed the Palaeo geographical pattern with a shallower deep-water depositional environment.The sedimentary environment consists of deep water continental shelf,shallow shelf facies,tidal flat lagoon.High quality black shale mainly developed in continental shelf facies,with the thickness in the range of20～120 m,NE trending.Shale clay mineral content ranged from 18.80%to 30.19%,with an average of 26.50%,mainly for illite mixed layer with strong adsorption of methane.The porosity distribution of shale is between 0.47% and 16.50%,with an average of 4.57%.Permeability is between(0.004～0.917)×10-32μm.Shale reservoir space research shows that there are 2 types,micro pores and micro cracks,and the most development of organic matter has a positive correlation with gas content.These results provide a basis ofr shale gas exploration and development.

关 键 词：龙马溪组 沉积环境 页岩厚度 岩矿特征 储集特征 

分 类 号：TE122.1[石油与天然气工程—油气勘探]