前新生代残留盆地宏观分布的综合地球物理研究--以大港地区为例  

Integrated geophysical research on macroscopic distribution of Pre-Cenozoic residual basins—A case in Dagang area

作　　者：郝天珧[1] 徐亚[1] 周立宏[2] 张丽莉[1] 江为为[1] 胥颐[1] 李军 赵百民[1] 王贝贝[1] 袁淑琴[2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油大港油田公司,天津300280 [3]中石化勘探研究院,北京100083

出　　处：《地球物理学报》2008年第2期491-502,共12页Chinese Journal of Geophysics

基　　金：863计划(2006AA09Z359);国家自然科学基金(40620140435,40674046);中国科学院重大项目(KZCX-SW-18-01)资助

摘　　要：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 indicate the macroscopic distribution of Pre-Cenozoic residual basins by geophysical data will be one of the most important study methods. Dagang area is chosen as an example in this paper to test the validity and applicability of integrated geophysical methods. On the base of analysis of rock physical properties, the distributions of gravity basement, magnetic basement, and residual thickness of Pre-Cenozoic group in the study area have been obtained by forward computation and inversion methods. The distribution of residual Pre- Cenozoic group in the study area is characterized by thickening zones in the east-west direction. It is obviously affected by later pressing stress in NW-SE direction. The boundary area between Chengning uplift and Qikou depression is an area with greatest residual thickness of Pre-Cenozoic group. Overthrust tectonics from south to north is in existence in this area. It is beneficial for Pre-Cenozoic hydrocarbon accumulation.

关 键 词：前新生代残留盆地 残余厚度 重磁方法 大港地区 油气资源 

分 类 号：P315[天文地球—地震学]