郯庐断裂带新构造运动对渤海东部油气聚集的控制作用

CONTROL OF THE NEOTECTONISM ALONG TANCHENG-LUJIANG FRACTURE ZONE ON HYDROCARBON ACCUMULATION IN THE EASTERN BOHAI SEA

郯庐断裂带控制了渤海东部凹陷、凸起的形成、演化,也控制了烃源岩、储盖层及圈闭的展布.郯庐断裂的力学性质早第三纪为张性,晚第三纪为张扭性.上新世后期,郯庐断裂强烈的活动形成了张扭性断裂背斜圈闭、压扭性断裂背斜圈闭、塑性拱张-底辟背斜圈闭,并改造加大了披覆背斜圈闭的面积和幅度.晚期形成的这些圈闭丰富了渤海湾盆地油气藏类型,扩展了勘探领域.与晚期构造相匹配,晚期强烈的断层活动促进了油气的运移和再分配,形成了一系列丰度高、储量大的油田,使本区成为我国近年来石油储量增长最大的地区.

The Tancheng Lujiang fracture zone not only controlled the formation and evolution of sags and swells in the Eastern Bohai Sea, but also controlled the distribution of source rocks, reservoir seal assemblages and traps in the basin. The fracture zone was composed of extensional faults during Paleogene, and of extensional wrenched faults during Neogene. The Late Pliocene strong movements along Tancheng Lujiang fracture zone have resulted in formation of extensionally wrenchedly faulted anticlines, compressionally wrenchedly faulted anticlines and diapir anticlines, and reformation and growth of drape anticline area and closure. These later formed structures have diversified types of hydrocarbon trap and extended exploration realm in Bohai Bay Basin. Matched with these structures, the late strong movements of faults have promoted migration are re distribution of hydrocarbon, forming a series of fields with high abundance and reserves and making the basin an area with the largest recent increase of reserves in China.