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引用本文:汪凯明. 桂中坳陷泥盆系页岩气成藏条件浅析[J]. 中国地质, 2013, 40(2): 430-438.
WANG Kai-ming. Shale gas accumulation conditions of Devonian strata in Guizhong depression[J]. Geology in China, 2013, 40(2): 430-438(in Chinese with English abstract).
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桂中坳陷泥盆系页岩气成藏条件浅析
汪凯明
作者单位
汪凯明 中石化华东分公司石油勘探开发研究院江苏 南京210011 
摘要:
提要:对桂中坳陷泥盆系泥页岩的成藏条件进行了分析,认为区内泥页岩主要发育在中-下泥盆统,该层系泥页岩分布面积广,沉积厚度大,有机碳含量高,泥页岩层段埋藏深度适中,具备页岩气成藏的基本条件。但桂中坳陷历经多期强烈的构造改造,断裂发育,部分地区还伴随岩浆活动,导致桂中坳陷页岩气藏的保存条件较差,而断裂和岩浆活动影响相对较小的中西部地区是桂中坳陷页岩气勘探的有利方向。认为在有机质演化程度高,构造运动复杂的地质背景下,页岩气的勘探必须强调保存条件,保存条件将会是制约中国页岩气藏勘探的关键因素之一。
关键词:  页岩气  成藏条件  保存条件  泥盆系  桂中坳陷
DOI:
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Shale gas accumulation conditions of Devonian strata in Guizhong depression
WANG Kai-ming
Abstract:
Abstract:Using samples from typical sections, drilling data and geochemical information from the Devonian black shale in Guizhong depression of central Guangxi, the authors analyzed the accumulation condition of shale gas reservoirs. The results demonstrate that there exist two suites of excellent marine source rocks in the middle and lower Devonian strata of Guizhong depression, which are characterized by large thickness and extensive distribution, high abundance of organic matter and moderate buried depth, thus possessing basic conditions for the formation of shale gas reservoirs. However, the preservative condition of shale gas is very poor because of the subsequent multistage severe tectonic movements as well as the development of faults and magmatic activities in some areas. Therefore, the central and western areas of Guizhong depression with integrated strata, underdeveloped faults and magmatic activities seem to be the favorable places for shale gas exploration. It is suggested that the preservation condition is very important in exploring shale gas resources under the conditions of high organic thermal evolution extent and subsequent multistage severe tectonic movements. The preservation condition is one of the key factors for shale gas exploration in China.
Key words:  shale gas  accumulation condition  preservation condition  Devonian  Guizhong depression