利用地球物理资料对沧东断裂带演化特征的研究

A STUDY ON EVOLUTION FEATURES OF CANG DONG FAULT ZONE BY USING GEOPHYSICAL DATA

本文对横切沧东断裂带（中南部）的２３条地震剖面进行分析解释，计算出各剖面的地层厚度和断距，并结合重、磁资料，对沧东断裂带和黄骅坳陷西部的构造演化进行了定量研究，发育特征为：沧东断裂带（中南部）在时间演化上可分为四期，空间演化上可分为六段，且控制了黄骅坳陷西部的反转构造；沧东断裂带作为黄骅坳陷的西界断裂，在中生代早中期为逆冲断层，中生代晚期至新生代转为正断层，它控制了坳陷的构造演化，对油气运移和富集起重要作用；

Cangdong fault zone is the west boundary fault of Huanghua depression.It was a reverse fault in Mesozoic era and became a normal one in Cenozoic era.It controls the structural evolution of the depression,and hence plays an important role in the transportation and enrichment of oil and gas.We analyse 23 seismic cross sections in southern and center parts of Cangdong fault zone,obtain fault throw and strata thicknesses,by using synthesized gravity and magnetic data,quantitative researches on the structural evolution of Cangdong fault zone and the western Huanghua depression show that: Cangdong fault zone can be divided into four temporal stages and six spatial sectors.It strongly affected the conversion of western Huanghua depression.The NWW faults in the depression adjusted the conversion of structure patterns.