柴达木盆地三湖北斜坡岩性气藏勘探与发现

Lithologic Gas Reservoir Exploration and Discovery in Northern Sanhu Slope,Qaidam Basin

柴达木盆地三湖地区第四系是在新近纪末期新构造运动作用下,盆地沉积中心由西向东整体迁移的产物,在第四系中发现了世界上最大的生物气田(背斜气田)。近年来,在三湖地区第四系发现了岩性气藏,开辟了三湖天然气勘探的新领域。通过构造背景、气源条件和生储盖组合等条件评价岩性气藏形成的基本地质背景;在简单回顾勘探历程的基础上,分析了已发现岩性气藏的地质、地震特征;针对岩性气藏的特征,提出了精细地震资料处理、精细等时格架地层对比和精细含气检测的研究方法,为下一步在该区开展岩性气藏的勘探研究工作提供了技术支持。

Under the effect of neotectonic movement at last stage of Neogene,the whole sedimentary center of Qaidam Basin migrated from west to east,and so the Quaternary system was generated in Sanhu Area.The world's largest biogas field was discovered in the system.In the past few years,lithologic gas reservoirs have been discovered in the system,which pioneered a new field for natural gas exploration in Sanhu Area.By evaluating the basic geological background for the generation of lithologic gas reservoirs in terms of tectonic settings,gas source conditions,and source-reservoir-caprock assemblage,on the basis of simply reviewing the exploration course,this paper analyses the geological and seismic features of the lithologic reservoirs.In view of the features of lithologic reservoirs,this paper puts forward the research method for precise seismic data processing,precise isochronic stratigrahic framework correlation,and precise gas bearing test,providing technical support for further exploration study in lithologic reservoirs of the Area.