石油实验地质2017，Vol.39Issue(4)：437-443,7.DOI:10.11781/sysydz201704437
复杂构造背景区页岩气富集条件研究——以大巴山前缘地区为例
Shale gas enrichment conditions in complex geological structure areas:A case study in the front margin of Daba Mountain
摘要
Abstract
A series of investigations on both outcrops and drilling cores from the front edge of Daba Mountain were carried out.Organic-rich mudstones collected from the Wufeng-Longmaxi formations in Fengjie-Kaixian-Baiquan-Manyue areas were sampled and analyzed.Information was obtained from thin sections and Scanning Electron Microscopy (SEM), and some relevant laboratory tests including organic geochemistry, X-ray diffraction, He-porosity and permeability and Specific Surface Area were made to summarize the basic geological conditions of Wufeng-Longmaxi formations in the study area.The results show that the organic-rich mudstones in the front edge of Daba Mountain were probably formed in a shallow to deep shelf during the Late Ordovician-Early Silurian.The thicknesses of these mudstones range 40-70 m, and the average total organic carbon (TOC) content is more than 2%.The kerogen mainly shows characteristics of type Ⅰ.The thermal maturity of mudstones ranges 0.82%-3.04%, indicating a high to over mature stage.Additionally, the features of low permeability and low porosity as well as several types of pore microstructures were observed in these mudstones.The analyses of typical wells indicate that the preservation of shale gas is a key element for hydrocarbon accumulation.The well-preserved box-shaped anticlines are most favorable for shale gas preservation.关键词
富有机质泥岩/页岩气富集条件/构造复杂区/五峰-龙马溪组/大巴山前缘Key words
organic-rich mudstone/shale gas preservation condition/complex geological structure area/Wufeng-Longmaxi formations/front margin of Daba Mountain分类
能源科技引用本文复制引用
康建威,林小兵,余谦,田景春,门玉澎,闫剑飞,林家善,孙媛媛..复杂构造背景区页岩气富集条件研究——以大巴山前缘地区为例[J].石油实验地质,2017,39(4):437-443,7.基金项目
中国地质调查局"四川盆地下古生界海相页岩气基础地质调查"(DD20160176)和重庆市国土资源和房屋管理局"重庆富有机质页岩沉积特征与储层评价研究"(渝地调设审字[2013]032号)资助. （DD20160176）
