石油与天然气地质 ›› 1996, Vol. 17 ›› Issue (1): 71-76.doi: 10.11743/ogg19960114

• 论文 • 上一篇    下一篇

湖南煤层气地质特征及远景评价

李启桂, 谢征康, 彭再兰   

  1. 中南石油地质局地质大队, 湖南长沙 410117
  • 收稿日期:1995-06-09 修回日期:1995-09-01 出版日期:1996-03-25 发布日期:2014-01-14

GEOLOGICAL FEATURE OF COAL GAS IN HUNAN AND ITS PROSPECTS

Li Qigui, Xie Zengkang, Peng Zhailan   

  1. Geological Brigade, Central-South Bureau of Petroleum Geology, MGMR, Changsha
  • Received:1995-06-09 Revised:1995-09-01 Online:1996-03-25 Published:2014-01-14

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摘要：

湖南主要含煤地层为下石炭统测水组和上二叠统龙潭组,含煤面积约5.5×104km2.区内煤系发育,煤的演化程度处于成熟-过成熟阶段,生气能力和吸附能力均较强。煤层含气量主要受控于含煤岩系的沉积环境、煤演化程度、埋藏深度、水文条件与构造条件;煤层的孔渗性主要受控于煤岩类型、煤化程度及地应力。水力压裂和洞穴完井是改善煤层低孔渗性的较有效方法。湘中洪山殿贫煤试验区和斗笠山焦煤试验区为煤层气开发最有利地区,目的层是上二叠统龙潭组煤层。

关键词: 煤层气, 地质特征, 生气能力, 远景评价, 试验区, 湖南

Abstract:

Coal measures in Hunan Province are mainly in the Lower Carboniferous Cheshui Formation and Upper Persian Longtan Formation. The coal-bearing areas totalled 5. 5?104km2. The coal series wiThin the study area are well developed. The degree of coal evolutionhas reached mature-over mature stage with relatively strong gas-producing capacity and absorbality. The gas content of the coal beds is controlled by the depositional envoironment, thedegree of coal evolution, buried depth, hydrologic condition and geological structure of thecoal-bearing measures, while its porosity and permeability are mainly controlled by coal-rocktype, coalification degree and ground stress. Hydraulic fracturing and cave completion are effective ways to improve poor porosity and permeability. Hongshandian lean coal experimentalzone in Central Hunan and Duolishan coke coal experimental zone are the most favourable regions to develop coal-bed methane.The target bed is the Upper Permian Longtan Formation.