Abstract：North Dongpu depression is a highly explored area, where seismic line density comes up to 0.5 ×0.5 (km). Drilling proves this area to be prolific of oil, Dongpu depression is a fault basin in which Mesozoic-Cenozoic sediments are dominant，the maximum thickness of Paleogene formation being 7,000m, This sediment series consists of two major sedimentary cycles, whose middle includes four kinds of salt lake facies: salt-gypsum facies, mudstone facies (sand<20%)，sand stone facies and sand-conglomerate facies, The four salt lake facies horizons form major source rock and reservoir systems therefore, it is significant to ascertain their distributions. The distributions of these lake facies horizons can be ascertained by integrative analysis of specially processed seismic data and drilling data, Rock salt was formed in very high sedimentary speed; therefore，its sedimentary context only occurs in active structural enviroment, There was such structural condition in Dongpu depression. In main subdepression where source rock was prolific, the sedimentary speed could come up to 0.26mm/a. Salt-an-hydrite beds were controlled by second order faulting, and they distribute in downthrow blocks of second order faults, All the four kinds of salt lake facies distribute in ringlike zones,From basin margin to the center, the facies sequence is sand-conglomerate facies, sandstone facies, mud stone facies and salt-gypsum fades, that is to say, sediment changes from elastic deposit to chemical deposit.
收稿日期: 1985-09-02
引用本文:
沈秀英, 段书府. 东濮凹陷北部盐湖相地震地层研究[J]. 石油地球物理勘探, 1986, 21(4): 380-390,404.
Shen Xiuying, Duan Shufu. The seismic stratigraphic analysis of salt lake facies in north Dongpu depression. OGP, 1986, 21(4): 380-390,404.
