湘中地区涟源凹陷下石炭统页岩气藏形成条件

来源期刊:中南大学学报(自然科学版)2014年第7期

论文作者:张琳婷 郭建华 焦鹏 张振

文章页码:2268 - 2278

关键词:湘中;涟源凹陷;下石炭统;页岩气;气藏形成

Key words:central Hunan; Lianyuan depression; lower carboniferous; shale gas; gas reservoir formation

摘    要:在观察野外地质露头和综合分析样品测试数据的基础上,对湘中地区涟源凹陷下石炭统暗色泥页岩的厚度与区域分布、有机质丰度、有机质类型、成熟度以及储层矿物学特征、烃源岩热演化史等页岩气藏形成条件进行研究。研究结果表明:与美国主要盆地的页岩气产区相比,该区暗色泥页岩的厚度较大且区域分布广泛,有机质类型以Ⅱ型为主,具有成熟高、脆性矿物丰富、物性较好、储渗空间相对较好等特点;采用地质类比法预测出涟源凹陷3个层位的页岩气总资源量为(0.223~0.460)×1012 m3;涟源凹陷的新化—冷水江一带是页岩气发育的最有利区。

Abstract: Based on comprehensive analysis of outcrops observation and sample testing data, the formation conditions of shale gas of lower Carboniferous in Lianyuan Depression at Middle Hunan were analyzed, such as regional distribution, contents of organic matter and its maturity, reservoir characteristics, burial history of the dark shale. The results show that, compared with the gas-producing shale in the main basin of the United States, the shale in the study area is characterized by wide distribution and great thickness. The organic matter is dominated by Ⅱ, high degree of mature, brittle mineral wealth, better physical properties, development of reservoir and flow space. Estimation with the geological analogy method shows that the shale gas volume in the three strata at Lianyuan Depression is (0.223-0.460)×1012 m3. The most favorable area for shale gas accumulation in the lower Carboniferous is along Xinhua—Lengshuijiang.

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