摘要
利用有限元平面应力分析法，对珠江口盆地的4个地震反射层（T8、T7、T5、T2）构造平面图进行区域构造应力场计算，编制成平面应力分布图。以此来分析该盆地各个时期构造应力场和盆地的构造演化，探讨油气储运的某些规律。通过分析认为，珠江口盆地内存在垂向旋扭应力场、拉张应力场和挠折应力场三种性质不同的应力场及其相应形成的构造形变，部分油气圈闭背斜是扩容作用形成的扩容背斜。油气聚集以近生油凹陷的有利构造为主。珠江口盆地的形成演化和印度板块与欧亚板块碰撞有密切关系。
With application of the finite element plane stress analysis method to 4 seismic horizons (T_g、T_7、T_5 and T_2),the regional tectonic stress fields are calculated,and maps of plane stress distribution are compiled.On the basis of these maps,the tectonic stress field in each period and tectonic evolution of the basin are analysed.Meanwhile,some regularities of accumulation and migration of oil and gas are discussed.This study shows 3 distinct stress fields and structural deformations related to them exist in the Pearl River Mouth basin,i.e.,vertical revolving-twisting stress field,schetching and bending fialds.In addition,some anticlines containing oil and gas are believed to be formed by the force of dilatancy.Oil and gas are mainly entrapped in structures near thermal kitchens.The formation and evolution of the Pearl River Mouth basin are related closely to collision of the Indian plate with the Eurasian.
出处
《中国海上油气（地质）》
CAS
1991年第1期25-37,共13页
China Offshore Oil and Gas(Geology)
