绕射丘状结构的成因及与油气藏的关系探讨

Geneses of the Diffraction Hilly Structures and a Discussion on the Relation between them and the Oil and Gas Pools

在四川盆地中部的地震水平叠加时间剖面上,中三叠统及下三叠统顶部广泛发育绕射丘状结构。针对这一现象,本文总结了它们的特征,分析了它们的成因,认为小幅度、低速度的盐丘是形成这些绕射丘状结构的地质实体,进而结合井下地质资料探讨了它们与油气藏的关系。

The diffraction hilly structures widely develop on the top of Middle Triassic and Lower Triassic in the seismic horizontal stacking time sections in the central part of Sichuan Basin. Aiming at this phe-nomenon, this paper summarizes their characteristics, analyzes their geneses and thinks that the salt domes possessing small amplitude and low velocity are the geological bodies forming such diffraction hilly structures, and then discusses the relation between them and the oil and gas pools, combining with the downhole geological data.