湘中和湘东南拗陷上古生界泥页岩含气性及其影响因素  

Gas-bearing characteristics and affected factors of Upper Paleozoic shale in depressions of Central Hunan and Southeast Hunan,China

作　　者：徐国盛[1] 张震[1] 罗小平[1] 张武 步少峰[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中海石油(中国)有限公司上海分公司,上海200030

出　　处：《成都理工大学学报（自然科学版）》2013年第5期577-587,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国土资源部油气专项(2009GYXQ15-06)

摘　　要：在湘中拗陷和湘东南拗陷区域地质背景及主要海相泥页岩系基本地质特征分析的基础上,应用野外露头观察、钻井资料解释和实验测试等分析手段,对泥盆系-二叠系7个目的层系24个泥页岩样品进行矿物X射线衍射定量分析、场发射电子显微镜扫描、等温吸附模拟实验,重点分析了有机地化参数、矿物组分及微观孔喉结构对含气性的影响程度。结果表明:湘中、湘东南拗陷上古生界泥页岩的页岩气赋存和吸附的主要空间为格架孔、溶蚀孔、有机质孔、生物体腔孔和微裂缝等,吸附含气量平均在1.51～1.60cm3/g。该区吸附含气量的主要影响因素包括有机碳含量、黏土矿物含量、有机质成熟度、孔径与比表面积等。Based on the analysis of the regional geological setting of the Central Hunan depression and the Southeast Hunan depression and the geological characteristics of the marine shale and using outcrop observations, drilling data, experimental testing and other methods, the authors study 24 shale samples from 7 targeted layers of Devonian-Permian, make the mineral X-ray diffraction quantitative analysis, field emission scanning electron microscopy, and isothermal adsorption simulation experiments, and emphatically analyze the degree of the influence of the organic geochemical parameters, mineral composition and microcosmic pore structure on the gas-bearing characteristics. The results show that the spaces of the occurrence and adsorption of the shale gas are mainly grid holes, corrosion holes, organic holes, organism cavities and micro-fractures. The adsorbed gas content averages over 1. 51--1. 60 cm3/g. The main influential factors that affect the adsorbed gas content are organic carbon content, clay mineral content, maturity of organic matters, pore size and specific surface area.

关 键 词：含气性 影响因素 泥页岩 泥盆系-二叠系 湘中 湘东南 

分 类 号：TE122[石油与天然气工程—油气勘探]