黄骅坳陷沙河街组层序地层样式及隐蔽圈闭预测

Sequence Stratigraphic Pattern and Forecast of Subtle Reservoir of the Shahejie Formation in Huanghua Depression

为了揭示黄骅坳陷中部沙河街组隐蔽油气藏的分布规律,运用层序地层学理论,根据对沙河街组岩芯、测井和地震资料的分析,在该组划分出2个二级层序、7个三级层序及21个体系域,建立了黄骅坳陷中区沙河街组层序地层格架,并探讨了其与沉积、构造演化的对应关系.根据现代沉积学研究结果,在黄骅坳陷中部沙河街组划分出5种沉积体系:扇三角洲体系、湖泊三角洲体系、近岸水下扇体系、深水浊积体系和湖泊体系.结果表明:该区隐蔽油气藏的有利勘探目标主要是歧南凹陷的低位域和高位域砂体.

The Shahejie formation in the central part of Huanghua depression is one of the most important oil-bearing and exploration formations. Based on sequence stratigraphy and analyses of cores,logging and seismic information, two second-order sequences, seven third-order sequences and twenty one system tracts were identified in Shahejie formation of the central part of Huanghua depression. The sequence stratigraphy frame was established and the relationship between the frame and sediment, structural evolution was analyzed. Fan delta system, lacustrine delta system, inshore subaqueous fan system, tubidite system in deep water and lacustrine system were identified in this formation based on modern sedimentology. The results show that the sand bodies of highstand and lowstand are favorable explore targets .in Qinan depression.