基于古地貌和断裂控制的辽西低凸起锦州S油田沙河街组沉积体系

Cognition of sedimentary system of Shahejie Formation in Jinzhou S Oilfield located in Liaoxi Low Uplift based on paleogeomorphology and fault control

为明确辽西低凸起锦州S油田沙河街组沉积相带展布及其控制因素,综合应用岩心、测井和地震等资料,分析古地貌特征、断裂系统展布及其对沉积体系演化的控制作用,确定沙河街组SQ1—SQ4层序沉积相类型,探讨沙河街组沉积体系的演化规律。结果表明:研究区沙河街组发育辫状河三角洲、扇三角洲、湖泊等沉积体系类型;古地貌整体控制沉积体系类型;构造转换带是锦州S油田沉积物的主要运移通道。古地貌较低的C区,以及受转换带二次运移沉积的F、G区发育辫状河三角洲前缘亚相,砂体厚度大,储层质量好,有利于油气富集。该结果为研究区有利相带及优质砂体预测提供参考。

In order to clarify the distribution of sedimentary facies and its controlling factors,based on core,well logging and seismic data,the palaeogeomorphological features,distribution of fault systems and their controlling effects on the evolution of sedimentary systems are systematically analyzed.The sedimentary facies types of the SQ1 SQ4 sequence of the Shahejie Formation were clarified,and the evolution of the sedimentary system was discussed.The results show that Shahejie Formation in the study area developed a variety of sedimentary system types,such as braided river delta,fan delta and lake deposit,and the paleogenomorphic features controlled the type of the sedimentary system as a whole,and the tectonic transfer zone is the main transport channel in Jinzhou S Oilfield.The C zone with lower paleogeomorphology and the F,G region with secondary transport sedimentation have developed the braided river delta front subfacies,which is a favorable oil and gas enrichment zone.The research results provide reference for the prediction of favorable facies belts and high quality sand bodies in this area,and have important guiding significance for oilfield development.