地球物理方法在中国油气资源战略选区中应用的可能性——以藏北羌塘盆地为例

Possibility of applying geophysical methods in strategic petroleum target area selection in China: A case study of the Qiangtang basin

简要回顾了地球物理方法技术在国内几个油田发现过程中的作用。针对中国油气资源战略选区中普遍存在的方法技术问题,以羌塘盆地为例,进行了较为全面深入的剖析。通过对已有资料和成果的分析,认为羌塘盆地实现战略发现的时机已经成熟。而要实现战略发现,目前亟待解决的问题是打参数井、圈定局部构造和寻找合适的方法技术。鉴于羌塘盆地特殊的自然环境和地质条件,提出了高精度大地电磁法、自然电场法、特殊条件下的地震勘探、井地联合地震勘探等关键技术。具体的工作部署是:查明有利区带中最有利的局部构造和构造部位,在最有利的构造部位实施参数井钻探,围绕参数井开展地质、地球物理勘探与综合研究。这些技术和方法的应用有望使羌塘盆地的油气勘探工作迈上新台阶。

The role of geophysical methods and techniques in the process of finding some oil-gas fields in China is reviewed briefly. Take the Qiangtang basin for example, the problems of methods and techniques that commonly arise in China＇s strategic petroleum target area selection are analyzed relatively completely and intensively. Through an analysis of available data and results, it is believed that the conditions for the strategic discovery of oil-gas accumulations in the Qiangtang basin have been ripe, and to realize the strategic discovery, what must be done is to drill parameter holes, delineate local structures and try to find suitable methods and techniques. Highly precise MT, self-potential methods, seismic exploration in special conditions and integrated well and surface seismic exploration are put forward according to the particular natural environment and geological conditions of the basin. The flow chart for finding oil-gas accumulations in the Qiangtang basin is as follows： first, delineate the most favorable local structures and particular sites in favorable districts or zones; then, drill parameter wells at the most favorable structural sites, and finally, perform geological-geophysical exploration and comprehensive study around the wells. The application of these methods and techniques would make oil and gas exploration in the Qiangtang basin step into a new stage.