渤海湾盆地地震勘探地层岩性油气圈闭的地质基础

渤海湾盆地油气勘探工作,已由以寻找构造油气藏为主,转到大力寻找非构造地层岩性油气藏的勘探阶段。本文针对地震方法能否在岩性油气藏勘探中有效地发挥作用的问题,分析和论述了该盆地地震勘探地层岩性油气圈闭的地质基础。指出了盆地的多期构造运动和多种类型的砂体是形成地层岩性油气圈闭的基础;盆地内砂、泥岩声学特性的差异,决定了用地震方法寻找砂岩体圈闭和直接检测油气的可能性。

GEOLOGICAL FOUNDATIONS OF SEARCHING FOR THE STRATIGRAPHIC AND LITHOLOGIC OIL-GAS TRAPS IN BOHAI GULF BASIN BY SEISMIC METHOD

For oil and gas prospecting, the focal point of our work has already been transferred from the stage of mainly searching for structural traps to that of searching for stratigraphic and lithologic traps. To aim directlyat the ability of seismic survey in ntnoiogic oll-gas exproration ,the au thor made a special examination of the basic geologic conditions, or, in other words, the geologic prerequisite, of such kind of survey. Based on the examination, it has been pointed out that the polycyclic tectonic movement and the existence of various kinds of sandstone are the basic conditions of forming the stratigraphic and lithologic traps and just because the acoustic property difference between sandstone and mudstone is big enough, this made it possible for us to carry out the sandstone trap exploration and the oil-gas direct detection in Bohai Gulf Basin.