Abstract:Bohai Sea basin included rzany fault blocks in Paleobene. Torsion movement created a particular palaeogeographic environment where mountains surrounded a lake in which rzany islands scattered. In the Iake basin exist rzany sand bodies, which can be classified into three major types: underwater fan, fan delta and delta. The seismic responses of these sand bodies differ from each other because of their different depositional environments, source materials and hydraulic mlgration conditions. Underwater fan is a near-mountain-coast sand body whose source material came from the surrounding mountain area. The underwater fan brings the reflection configuration: strong top and bottom reflections outlining its wedge shade, top reflections showing overlaps, rare reflections inside and at proximal part, continuous reflections at middle part and weak reflections at distal part. Fan delta is progradational alluvial fan created by swift braided channel emptying into sea or lake, and lies at the front side of active continental margin. It has the shape of convex lens and shows a distinct progradational reflection configuration. Delta is river sediment lying at the meeting area of a river and the sea basin. The sedimentary sequence is usually thick. The progradational reflection configuration is dominantly oblique, and seldom in "S" pattern. The three kinds of sand bodies are proved favourable to hydrocarbon accumulation.
收稿日期: 1986-04-19
引用本文:
姜锡江. 渤海湾盆地下第三系砂岩体的反射特征及含油气条件[J]. 石油地球物理勘探, 1987, 22(1): 64-72.
Jiang Xijiang. The seismic response of Paleogene sand bodies in Bohai Sea basin and their hydrocarbon hearing conditions. OGP, 1987, 22(1): 64-72.