摘要
位于万安滩西陆架区的万安盆地处于印支地块南缘、曾母次地块的西北侧,是新生代发育的大型板内具扭性的断坳复合型盆地。由于可能受向南延伸的红河区域走滑大断裂(RRF)的影响,多有右旋剪切应力场作用。故万安盆地的边界断层和盆内断层均不同程度地反映出扭动构造特征和扭动构造样式。早第三纪以张扭作用为主,后期(晚中新世)局部地区受到轻微压扭作用的改造。与扭动构造伴生的圈闭类型多样,烃源丰富,成熟度高,具有良好的油气聚集保存条件。
The Wan'an Basin,located in the western shelf zone of Wan'an Bank,and on the north- west of Zengmu submass,is a comprehensive Cenozoic taphrogenic macroscopic intraplate. As shown by regional tectonic setting,possiblly influenced by the southward streching Honghe regional strike-slip fault and its dextral shear stress field, the basin's edge faults and in- traplate faults reflect mostly the shear tectonic property and the shear tectonic pattern. But the tension-shear movement predominated in the early Tertiary period, and in the late Miocene epoch,some local regions were modified by the slight compresso-shear effort. The traps accompanied by shear tectonics are diversifying and abundant with hydrocar- bon source rock. So they are prospective with favorable oil and gas accumulation and good re- serving conditions.
出处
《南海地质研究》
1995年第7期22-29,共8页
Gresearch of Eological South China Sea
