摘要
美国5大页岩气盆地的勘探开发实践已证明,页岩气是一个很有潜力的非常规油气勘探新领域,资源丰富。页岩气与深盆气、煤层气一样属于"持续式"聚集的非常规天然气。在页岩气系统中,富含有机质的页岩既是系统的烃源层又是储层,也可能是盖层,各产层地质、地球化学条件迥异。页岩气存在形式主要以吸附气与游离气为主,形成机制可划分为生物成因、热成因及二者混合成因。页岩气的地质储量丰富,影响其成藏的因素主要有总有机碳、有机质类型和成熟度、产层孔隙度、地层压力及裂缝发育程度等,同时还要兼顾各参数之间的联系。四川盆地发育2套优质页岩(下寒武统筇竹寺组和下志留统龙马溪组),与美国5大页岩气盆地相比,具备形成裂缝性油气藏所需的优越的地质、地球化学条件,是一个天然气勘探开发值得高度重视的新领域。
The history of exploration and production in North America has proved that shale gas is an unconventional resource with great exploration potential. Shale gas is a continuous accumulation of natural gas as well as deep-basin gas and coal-type gas. Shale with high organic matter not only acts as source rock, but also gas-producing layer and cap rock. The geological and geochemical conditions of shale gas formation are different in different gas layers. The shale gas mainly consists in absorbed and free gas generated from biological function, thermal decomposition or mixing of both. So, the geological reserve of shale gas is rich. The main factors of gas accmulation are total organic carbon （TOC）, type of organic matter, thermal maturity, porosity of gas producing layer, formation pressure and fracture, etc. In addition, the correlation of these factors should be paid attention. In Comparison with to shale-gas North America basins, two sets of high quality shale （i. e. Lower Cambrian Jiulaodong Formation and lower Silurian Longmaxi Formation） in Sichuan basin have good conditions of geology and geochemistry for shale gas accumulation. Therefore, it should be paid more attention to shale gas exploration and production in Sichuan basin.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2010年第2期350-356,共7页
Natural Gas Geoscience
基金
中国石油天然气集团公司科技攻关项目(编号:2008B-0502)资助
关键词
页岩气
成因机制
赋存形式
含气量
四川盆地
Shale gas
Genetic mechanism
Occurrence type
Gas content
Sichuan basin.
