临南洼陷沙三段层序发育对岩性油藏的控制

The Control of Sequence Development on Es_3 Lithological Reservoirs of Linnan Depression

利用高分辨率层序地层学原理,在临南洼陷沙三段的一个长期基准面旋回内部识别出8个有时间地层对比意义的界面,包括4个层序界面,4个最大湖泛面,划分出C1～C4共4个中期基准面旋回,建立了全区的层序地层格架,并在等时地层格架内对沙三段各中期基准面旋回内的沉积相和沉积体系进行了详细分析,总结了临南洼陷岩性油气藏分布规律,认为临南洼陷岩性油气藏分布受控于4大(扇)三角洲沉积体系形成的各类滑塌浊积扇或深水浊积扇,指出了商64断裂带、夏101-商74反向屋脊带、临北断阶带、夏49反向屋脊带等是寻找岩性油气藏的有利目标区。

Based on high-resolution sequence stratigraphy,in a long-term base-level cycle,eight horizons including four sequence interfaces and four maximum flooding surfaces were identified,and four intermediate-term base-level cycles named from C1 to C4 were divided,and then the sequence stratigraphic framework was established in the depression.In the chrono-stratigraphic framework,the long-term base-level cycle sedimentary facies and depositional systems in Es3 were analyzed in detail.Occurrence regularity of lithological reservoir distribution was pointed out.It was considered that lithological reservoir distribution is controlled by the turbidite fans and the underwater fans formed by four(fan)delta depositional systems.Eventually it is pointed out that the Fault Belt Shang 6,the reverse roof belt of Block XIA 101-Shang 74,Linbei Fault-step Belt and Reverse Roof Belt Xia 49 are the beneficial exploration areas