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如何通过地球物理资料圈划残留盆地的宏观分布是残留盆地油气研究中重要的方法技术之一.本文以大港地区为例介绍了残留盆地宏观分布的地球物理研究方法.通过岩石物性分析,利用正演与反演方法,求取本区的重力基底(对应本区新生界底界)和磁性基底(对应本区太古界顶界)埋深,进而计算前新生界残余厚度,讨论残留盆地的宏观分布特点,并预测了前新生代油气资源有利区.研究结果认为本区前新生界残余厚度分布具有“东西分带”的特点,残余厚度增厚带大多沿NE方向展布,表明后期来自NW-SE向的挤压应力对其分布有一定影响;埕宁隆起与歧口凹陷的结合部位是本区前新生界残余厚度最大的地区,存在由南向北的逆掩断裂构造,有利于前新生代油气的聚集.
How to draw the macroscopic distribution of the residual basins through the geophysical data is one of the most important methods and techniques in the study of oil and gas in the residual basins.Based on the example of Dagang area, this paper introduces the macroscopic geophysical research methods of the residual basins.According to the petrophysical properties, And inversion method, the buried depth of gravity base (corresponding to the bottom of Cenozoic in this area) and the magnetic base (corresponding to the top of arctic boundary in this area) are calculated, then the residual thickness of pre-Cenozoic boundary is calculated, and the macroscopic observation of residual basins Distribution characteristics and prediction of pre-Cenozoic oil and gas resources favorable area.The results show that the residual thickness distribution of Pre-Cenozoic in this area has the characteristics of “east-west zonation”, and the thickening of residual thickness is mostly distributed in NE direction, The compressive stress from the NW-SE direction has some influence on its distribution. The junction between the Suining and Qikou sag is the area with the largest residual thickness of the Pre-Cenozoic in this area, Contribute to the accumulation of pre-Cenozoic oil and gas.