郯庐断裂活动对渤海东南部油气成藏的控制作用

DOMINATING ACTION OF TANLU FAULTING MOVEMENT ON HYDROCARBON RESERVOIR FORMATION IN SOUTHEAST BOHAI BAY

郯庐断裂是渤海东部最重要的走滑大断裂，新生代郯庐断裂在渤海东南部经历了伸展断陷、右旋走滑和晚期构造再活动3个过程。郯庐断裂在古近纪早期的伸展断陷和晚期的右旋走滑压扭作用为渤海东南部创造了优越的生油条件和良好的圈闭条件，控制了始新世、渐新世湖相烃源岩，形成了大量的油气圈闭。断裂多期活动直接控制了油气的分配和富集的层位。研究认为，与生油凹陷相邻的长期继承性活动的同沉积断裂带和走滑断裂带是油气聚集的有利场所，预测凹陷内的次级凸起带、青东凹陷东部盆缘走滑断裂带、莱州湾凹陷东部走滑断裂带为区域内有利的油气勘探区带。

Tanlu Fault is the most important strike-slip fault in East Bohai; Cenozoic Tanlu Fault here has experienced three stages ： extended faulted rift, right-rotated strike slip and re-moving of late structure. Early Palaeogene extended rift and Late Palaeogene right-rotated compresso-shear strike slip in Tanlu Fault provide super oil-generating and much better entrapping conditions in Eastsouth Bohai. And furthermore the above structural movements control the formation of Eocene and Oligocene lacustrine source rocks, thus in the end enormous hydrocarbon traps have generated. Multi-stage movements of these faults directly dominate the distribution of hydrocarbon and its enriched layers. The studies show that the ment nearby the oil generating sags are heave belt and the strike-slip fault belts syndepositional fault and strike-slip fault belts of long-term inherited move- the favorable plays for hydrocarbon accumulation, and moreover the subin the eastern margins of Qingdong and Laizhou Bay Sags are predicted to be favorable petroleum exploration plays in this region.