湘中坳陷下石炭统孟公坳段页岩气成藏条件及勘探前景

作    者：曹清古1，韦庆亮1，肖秋苟2，孙庭金2，王津义1
单    位：（1中国石化石油勘探开发研究院无锡石油地质研究所；2中国石化勘探南方分公司）
基金项目：受中国石化股份公司油田部科研项目“南方外围探区选区评价与勘探部署研究”资助
摘    要：
通过野外地质调查，结合实验测试数据和地震资料，对湘中坳陷下石炭统岩关阶孟公坳段页岩气勘探前景进行了探索。由烃源条件、保存条件、页岩气赋存条件及页岩可压裂性等方面的研究表明，该套泥页岩沉积厚度较大，富含有机质，有机质类型以Ⅱ型为主，TOC在1.32%~3.10%，镜质组反射率普遍大于2.0%,且处于过成熟演化阶段，具备页岩气成藏的烃源条件。从岩石结构、矿物成分、吸附性能等方面揭示出该套页岩发育良好的天然气赋存空间，且具有良好的吸附性能。黏土矿物含量及较好的顶底板条件决定了该套页岩具有良好的可压裂性。湘中坳陷的构造活动相对较弱，盖层封盖性能良好，有利于页岩气藏的形成和保存。
关键词：湘中坳陷；早石炭世；孟公坳段；页岩气；油气成藏；成藏条件

Gas Accumulation and Exploration Prospect of Lower Carboniferous Menggongao Shale in Xiangzhong Depression

Author's Name: Cao Qinggu, Wei Qingliang, Xiao Qiugou, Sun Tingjin, Wang Jinyi
Institution: MSc., Petroleum Geology Engineer. Add: SINOPEC Wuxi Institute of Petroleum Geology
Abstract:
Based on investigation and analysis of outcrop, experimental and seismic data, thick organic-rich Lower Carboniferous Menggongao shale develops in Xiangzhong Depression, Hunan. Result of geochemical analysis indicates that the general kerogen is commonly Type-Ⅱ and the average value of Ro is commonly >2.0% in the shale with overmature evolution, which means abundant source of hydrocarbon. It is shown that this shale has good conditions of gas accumulation and preservation because of week tectonic activities and good gas-sealing capacity.
Keywords: Early Carboniferous; Menggongao Member; Shale gas; Hydrocarbon accumulation condition; Xiangzhong Depression
投稿时间： 2014-06-23  
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