利用地震反射前积结构确定古水流体系

本文依据沉积学和地震地层学理论研究了惠民凹陷西部近万公里的地震剖面,利用地震前积反射和地质资料分别研究和确定了该区沙三段下部沉积时期的古水流体系,包括研究区西部临盘长轴三角洲水流体系、南部夏口短轴三角洲水流体系和北部滋镇扇三角洲水流体系。其中西部临盘长轴三角洲水流体系是研究区沙三下沉积时期最重要的水流体系。研究结果表明,利用地震前积反射结构和地质资料分别确定的古水流体系具有良好的一致性。文中指出,在少井或无井地区进行古水流体系分析时,利用地震前积反射结构确定古水流体系是行之有效的方法。

APPLICATION OF SEISMIC CLINOFORM REFLECTION TO THE DETERMINATION OF ANCIENT FLOW SYSTEM

On the basis of sedimentology and seismic stratigraphy, this paper presents the application of seismic clinoform reflection to the determination of ancient flow system in the west of Huimin depression. By analysing seismic sections of about 10 000km, three ancient flow systems were determined, including Linpan longaxis delta in the west of the area, Zizhen fandelta in the north and southern Xiakou short-axis delta in the south. Linpan long-axis delta flow system was the most important one durii.g the deposition of the lower part in the third member of Shahejie formation. This paper uses geological information to determine the ancient flow system in the same formation, which is in good agreement with that determined by seismic clinoform reflection. The application of seismic clinoform reflection to the determination of ancient flow system is an effective method for the exploration areas with a few or no wells.