长岭凹陷层序地层分析

ANALYSIS OF SEQUENCE STRATIGRAPHY IN CHANGLING DEPRESSION

魏志平 唐振兴 江涛 姜呈馥 王安辉

Wei Zhiping Tang Zhenxing Jiang Tao Jiang Chengfu Wang Anhui

根据较大的区域不整合,长岭凹陷可以划分为泉头组-青山口组和姚家组-嫩江组两个二级层序。以局部不整合、沉积转换面为标志,青山口组可划分出 4个三级层序。位于保康三角洲砂体前缘带的大情字井地区,在层序S1和S2低位体系域中砂岩分布广泛,为该区的主要含油层段。层序地层不仅控制油气藏的类型,而且还控制含油性。据统计,60%的工业油气井位于低位体系域。

On the basis of the larger regional unconformity,Changling depression can be divided into 2 second-order sequences of Quantou Formation-Qingshankou Formation and Yaojia Formation-Nenjiang Formation.Marked by the local unconformity and sedimentary transformation base,Qingshankou Formation can be subdivided into 4 third-order sequences.In Daqingzijin region situated in front of the deltaic sandstone body of Baokang,sandstone bodies are widely spread in sequence S1 and S2 of lowstand system tracts which are main oil-bearing strata in that region.Sequence stratigraphy does not only control the type of oil and gas accumulation but also control the nature of oil bearing.60% of industrial oil and gas wells are estimated to locate in the low level system tracts.

10.11743/ogg20020215