南黄海盆地南部坳陷晚白垩世-第四纪构造演化对油气的控制

CONTROL ON PETROLEUM BY TECTONIC EVOLUTION OF THE LATE CRETACEOUS-QUATERNARY IN THE SOUTH DEPRESSION OF THE SOUTH YELLOW SEA BASIN

受盆地差异成因机制的影响,南黄海盆地南部坳陷类型及构造演化有多种认识,并存在很大争议。通过重新划分构造单元和构造层,深入研究构造特征;将建湖隆起延伸入海,首次提出将南二凹陷划分为南二凹陷北和南二凹陷南两个凹陷;建立盆地构造格架,明确中新生代构造演化阶段及性质,以张引作用为主与挤压隆升相间,构成多期构造旋回;揭示构造对油气的控制作用,确定阜宁组为烃源岩发育有利层位,南五凹陷为烃源岩分布最优区域,并认为南五凹陷可以存在二次生烃;进行油气成藏模式对比,从而优选南五凹陷为最优区块。

Affected by differences in genetic mechanism of the basin, on the issue of the south depression of South Yellow Sea Basin and tectonic evolution have a variety types of understanding, and there have a big controversy. Through a detailed study of the structural characteristics and the redivision of tectonic units and structural layers, extending the Jianhu Uplift into the sea, and first proposed dividing the South Second Depression into northern and southern of the South Second Depression; establishing basin tectonic framework, confirming the stage and nature of the Mesozoic-Cenozoic tectonic evolution, mainly on the extension force and interphase with compressional uplifting, forming the multi-structural cycles; and revealing the tectonic controls on oil and gas, and the South Fifth Depression for optimal distribution of hydrocarbon source rock area, thereby determining Funing Group is the favorable stratigraphic position of hydrocarbon source rocks, and that there can be secondary hydrocarbon generation of South Fifth depression, the other depression are first hydrocarbon generation;conducting the comparison of hydrocarbon accumulation pattern, and thus is preferable to be the first-priority block.