华北盆地区域地震剖面的地质解释及其构造演化特征

GEOLOGICAL INTERPRETATION AND THE CHARAC-TERISTICS OF TECTONIC EVOLUTION ON REGIONAL SEISMIC PROFILE IN NORTH CHINA BASIN

韦正金 张福水 黄风珍

Wei Zhengjin Zhang Fushui Huang Fengzhen

地质矿产部华北石油地质局第四物探大队

The 4th Geophysical Exploration Brigade, North China Bureau of Petroleum Geology, Ministry of Geology and Mineral Resources

华北盆地是一个中、新生代断拗转化型的含油气盆地,它是在晚元古代(震旦亚代)至三叠纪发育的华北地台东部的基础上经过印支—燕山—喜山等多期构造运动而成。这一事实已被愈来愈多的地震剖面所揭露,其基本地震地质剖面结构的特征见於表1,图1。

North China Basin attributed to a type of cratonic basin from Sinian to Triassic time is superimposed by Meso-Cenozoic converted faultdown basins. The characteristics of seismic waves can be grouped into three regional datum waves, six reflective waves of local or erosion surfaces with four tectonic systems and six tectonic sub-systems. The basin might be divided into three types: the large scale of depression basin during Q-N; the graben and/or half-graben basin during E-J and the cratonic basin in T-Z period. In accordance to integrated geological inter-pretations and the data from seismic profile and gravity/electrical surveys, the tectonic evolution of the basin can be divided into three stages: the 1st stage, the platform developed steadily from Sinian to Triassic; the 2nd stage, two diktyogeneses took place under the joint actions of Tethys and Kula Plate from Late Indosinian to Early (or Middle) Yanshanian and Late Yanshanian to Early Xishanian with twice stress conversions and two different times of extension and depression basins; the 3rd stage, the collision between Indian Plate and Eurasian Plate, bringing about the third diktyogenesis and thd basin transformed from faultdown to depression.

https://doi.org/10.11781/sysydz198603243