页岩气成藏模式研究  

Study on shale gas accumulation mode

作　　者：刘成林[1] 葛岩[1] 范柏江[1] 公王斌[1] 朱玉新[2] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2010年第5期1-5,共5页Petroleum Geology and Recovery Efficiency

基　　金：国土资源公益性行业科研专项"东北地区油页岩科学研究基地研究"(201111012)

摘　　要：通过将页岩气与煤层气、深盆气的成藏条件进行对比,总结了页岩气藏的物质来源、储集条件、运聚条件、成藏要求与保存条件,建立了页岩气成藏模式。将页岩气成藏分为早期运聚成藏、中期原地聚集成藏和晚期裂缝调整成藏3个阶段,并结合实例分析了页岩气各阶段的成藏特征。在与美国页岩气藏储集参数分析、对比的基础上,对页岩气的3种成藏模式进行了总结。早期运聚成藏阶段主要生成生物气,气体主要以游离相和溶解相的形式运移至构造高部位,保存于泥页岩原生孔隙中;中期原地聚集成藏阶段页岩开始大量生成热解气和裂解气,并在不同的构造部位形成异常压力体系,页岩气主要表现为原地聚集,气体主要保存于次生孔隙和少量原生孔隙和微裂缝中;晚期裂缝调整成藏阶段主要生成干气,页岩内部构造及成岩裂缝大量发育,相对封闭的压力体系遭到破坏,裂缝沟通不同的封闭体系,页岩气可调整成藏,由构造低部位向高部位短距离运移。Based on the comparison of reservoir accumulation between shale gas,coal-bed gas and deep basin gas,the source,reservoir con-dition, migration and reservoir formation of shale gas reservoir is herein generalized so as to construct the reservoir mode of shale gas. The shale reservoir may be divided into three stages, the early migration and trapping,medium period in-situ trapping and late fracture deformed trapping,moreover,the reservoir features are further analyzed with respect to reservoir formation by means of analysis of field example. Based on the analysis and comparison with the shale gas reservoir in North America, the 3 reservoir models are generalized. For the reservoir formed by early migration and trapping, the biogenic gas predominates, and the gas is migrated into the pore spaces of shale developed in the high structure zone in form of free and solution phase. For the medium period reser-voir, the thermolyzed and pyrolyzed gas predominate and accumulated in different structure position to form the abnormal pressure system, and mainly in the form of in-situ accumulation and preserved mostly in the secondary pores and somewhat in some primary pores and micro-fractures. For the late fracture deformed reservoir,the dry gas predominates,and fractures are well developed and connected in the structure and trapping so as to break the relatively sealing system,and form the new gas reservoir during the short migration from low structural point to the high accumulation zone.

关 键 词：页岩气 气源岩 成藏模式 原地聚集 调整成藏 

分 类 号：TE112.1[石油与天然气工程—油气勘探]