东濮凹陷胡-庆断阶带油气成藏条件及潜力分析

Reservoir-forming Conditions and Potential Analysis of Hu-Qing Fault Step Zone in Dongpu Depression

东濮凹陷胡-庆断阶带为三个斜列展布的台阶式结构。位于洼陷区的一台阶以断鼻、墙角断块圈闭为主,形成构造+岩性复合油气藏;位于两条阶梯断层之间的二台阶,形成垒堑相间的构造格局,顺向断鼻、反向屋脊断块圈闭发育,是油气聚集成藏的主要场所;三台阶构造比较简单,局部断层运移通道发育区形成油藏。一台阶离油源近,资源潜力大,近洼找具构造轮廓、砂体控制的岩性油气藏是主要方向;二台阶勘探程度较高,在主力油层深部和浅层寻找新的含油层系和新的含油领域为主要方向;三台阶离油源较远,应慎重勘探。

Hu - Qing fault step zone in Dongpu Depression has an echelon three - step structure. Fault nose and wall -corner fault block traps and structural and lithologic combination reservoirs exist in the first step zone in the depressed area; well- developed consequent fault nose and reverse roof fault block traps exist in the second step zone that is located between the two step faults and is the main area for hydrocarbon accumulation; while the third step zone is relatively simple where some reservoirs can form along well - developed local fault migration paths. The first step zone is close to oil sources, thus has large resource potentials and lithologic reservoirs are the main prospecting targets; the second step zone has been highly degree of prospecting, thus the focus of exploration should be put on looking for new oil - bearing layer series in the deep of main layers and shallow layers; and the third step zone is far away from oil sources, so exploration in this area should be carried out carefully.