合肥盆地电性特征

ELECTRICAL CHARACTERISTICS OF THE HEFEI BASIN

张升平 汪启年 张交东 战双庆 李学田 汪传奇 赵建华

ZHANG Sheng-ping WANG Qi-nian ZHANG Jiao-dong ZHAN Shuang-qing LI Xue-tian WANG Chuan-qi ZHAO Jian-hua

中国石化, 胜利油田有限公司, 勘探项目管理部, 山东, 东营, 257015 2. 地质矿产部, 第一综合物探大队, 安徽, 蚌埠, 233005

Department of Exploration Administration, Shengli Oilfield, SINOPEC, Dongying, Shandong 257015, China 2. No.1 Integrated Geophysical prospecting Party, MGMR, Bangbu, Anhui 233005, China

合肥盆地的电性资料反映:a)盆地盖层电阻率总体较低,E、K为低阻层,侏罗系为相对高阻层;b)基底电性差异较大,上古生界为低阻电性层,且在盆地南部广泛发育,下古生界为相对高阻层,元古界等古老地层为高阻层;c)盆地经过印支期、燕山期等多次南北向挤压、拉张运动形成近东西向展布的隆凹相间的构造体系,在喜山期随着郯庐断裂带的活动形成北东向构造带;d)舒城断裂附近为大别地块和华北地台的结合地带,华北地台向大别地块之下俯冲;e)在盆地南侧推覆体之下可能掩盖着上古生界沉积盆地,这可能在油气勘探中有重要的地质意义。

The electrical data of the Hefei Basin revealed that a) the caprock resistivity of the basin is lower on the whole, E and K are low-resistance strata, and the Jurassic is relative high-resistance strata; b) the electrical properties of basements are greatly different: the Upper Paleozoic which is widely developed in the southern part of the basin is low-resistance strata,the Lower Paleozoic is relative high-resistance strata, and the Proterozoic and other old strata are high-resistance strata; c) a near-WE distributed and uplift-depression alternated structural system was formed in the basin through many times of NS compression and extension during the Indosinian and Yanshanian periods, and a EN structural zone was developed in the Himalayan period along with the activation of the Tanlu Faulted Belt; d) near the Shucheng Fault is the conjoint belt of the Dabie Block and the North China Platform with the North China Platform subducting under the Dabie Block; e) the Upper Paleozoic sedimentary basin which might be covered under the nappe on the southern side of the basin may be of important geological significance in the oil and gas exploration.

https://doi.org/10.11781/sysydz200203250