珠江口盆地北部坳陷带构造特征  

Structural features of the northern depression belt in the Pearl River Mouth Basin

作　　者：刘志峰 王升兰 丁亮 印斌浩 柯岭 

机构地区：[1]中海油研究总院,北京100028

出　　处：《地质学刊》2016年第1期135-141,共7页Journal of Geology

基　　金：国家科技重大专项"近海富烃凹陷资源潜力再评价和新区;新领域勘探方向"(2011ZX05023-001);"近海大中型油气田形成条件与分布"(2011ZX05023-006)部分研究成果

摘　　要：构造演化分析表明,珠江口盆地北部坳陷带在新生代经历了断陷期、断—坳转换期和坳陷期三大演化阶段,而断陷期又可进一步划分为文昌期和恩平期2个裂陷幕。由于纵向上2幕裂陷作用的迁移和地层不完全叠置,在坳陷带内形成了厚文昌薄恩平型和薄文昌厚恩平型2种类型的凹陷,其中前者是较为有利的富生烃凹陷。北部坳陷带内各凹陷断裂十分发育,且具有多期活动的特点。根据断裂活动时间可将其分为3类:早期活动型、晚期活动型和早晚持续活动型。早期活动型断裂对凹陷和构造带的形成、发育起到控制作用,晚期活动型断裂对圈闭形成与定型、油气运移起到控制作用,早晚持续活动型断裂兼有前两者的共同特征。The structural evolution analysis shows that the northern depression belt of the Pearl River Mouth Basin has experienced three evolutional stages in the Cenozoic, i.e., rift stage, transitional tiff-depression stage and depression stage, and that the tiff stage can be further divided into two rifting episodes of the Wenchang period and Enping period. Due to the migration of the two rifting and incomplete stratigraphic juxtaposition, two types of depressions, i.e. ,＂thick Wenchang to thin Enping formations＂ and ＂thin Wenchang to thick Enping formations＂ types, were formed in the depression zone, of which the former type is favorable for hydrocarbon generation. Faults are very developed in the northern depression beh, and are featured by multiple periods of fault activities. According to the activ- ity time, the faults can be divided into three categories： early active type, late active type and sustained active type. The early active faults control the formation of the depression and tectonic belts ; the late active faults control the formation and shaping of traps, and the oil and gas migration ; and the sustained active faults possess the common characteristics of the former two types.

关 键 词：凹陷类型 构造 断裂 北部坳陷 珠江口盆地 

分 类 号：P618.130.2[天文地球—矿床学] P722.7[天文地球—地质学]