摘要
珠江口盆地自新生代以来，曾先后受到不同方向张应力的作用，造成了不同时期构造体系的交叉叠合。中中新世以来构造运动强烈，并具有东强西弱的特点，对油气的运移与聚集产生了重要影响。开平凹陷的剧烈断裂和断裂活动始于新世，并在同期沉积了巨厚的文昌组。晚渐新世以后，由于断裂活动非常微弱，在成熟的烃源岩与其上地层之间缺乏有效的油源断层，因而自生自储、近距离运移可能是开平凹陷油气聚集的基本特征。在凹陷内部，因重力滑动和欠压实泥岩共同作用所形成的KP11－1构造带可能是该区最具有油气远景的地区。
Pearl River Mouth Basin has been being under extensional stress with different direction at different time during Cenozoic, which made tectonic systems formed in dissimilar period crossly overlap. The tectonic movement has been being strong and has been characterized as 'strong in the east and weak in the west' since Middle Miocene, which control significantly hydrocarbon migration and accumulation. Kaiping Sag, located at the weatern part of Zhu Ⅱ Depression, was intensively faulted and rifted in Eocene. At same time massive Wenchang Formation was deposited in Kaiping Sag. The faulting activity has been being very weak since Late Oligocene, so that there are no faults to act as conduit between mature source rock and overlain strata. In this case, the accumulation probably was formed by short-distance lateral migration. KP 11-1 lead zone, formed by gravitational sliding together with undercompacting shale, should be the most prospective targets.
出处
《中国海上油气（地质）》
1998年第1期12-18,共7页
China Offshore Oil and Gas(Geology)
关键词
珠江口盆地
开平凹陷
油气聚集条件
断裂活动
断裂构造带
运移
重力滑动
Kaiping Sag
%#
faulting activity faulted structure zone
gravitational sliding
accumulation condition
migration
