渤中环形构造带特征和成因分析及其石油地质意义探讨

渤中凹陷为我国东部少有的富生烃凹陷,具有极大地油气勘探潜力。本文通过对渤中凹陷和其周缘各构造单元的展布关系、断裂系统的发育情况进行了系统梳理分析,认识到以渤中凹陷和渤东凹陷为中心的构造带具有环形构造的特征,以此为基础提出了"渤中环形构造带"的概念; 进一步对环形构造带的成因加以分析,认为可能是中生代末至始新世的深部热力构造作用(地幔热柱上涌)造成的; 最后依照环形构造带这一新思路,将渤中—渤东凹陷看作环形构造带内统一的烃源灶,对环形构造带的石油地质特征进行了分析,以期能进一步对油气勘探工作有所启发。

Characters and genesis of Bozhong ring structure belt and its oil geology significance

Bozhong sag,as one of the rare rich hydrocarbon generative sag in east China,has a huge exploration potential of oil and gas.In this paper,the characteristic of each tectonic unit's distribution and their fault development in Bozhong sag and its vicinity are systematically analyzed; and it is showed that the tectonic belt which center is Bozhong and Bodong sags has a ring structure characteristic.Therefore,we propose a new concept,i.e., Bozhong ring structure belt.Further analysis on the ring structure's genesis shows that it was caused by deep thermal structure activity(the up willing of mantle plume)during the Late Mesozoic and Eocene.In the new idea of ring structure,Bozhong and Bodong sags are regarded as a whole hydrocarbon kitchen,and the petroleum geology of Bozhong ring structure is also discussed,so as to the revelatory function of the new idea to the hydrocarbon exploration can be obtained.