渤中坳陷披覆背斜大油田形成特征

Genetic features of drape anticline oilfields in the Bozhong Depression

渤中坳陷披覆背斜大油田含油层系集中在新近系明化镇、馆陶组,主要在凸起或低凸起构造上分布。渤中坳陷PL19-3油田、QHD32-6油田和CFD11-1油田油源主要来自渤中凹陷,披覆背斜油气田具有紧邻富生烃凹陷、良好的储层及储盖组合、有利的构造位置、优良的疏导体系组合等形成特征。同时,结合渤海海域在凸起和低凸起构造上探井的失利原因,认为在新近系寻找披覆背斜大油田应注重运移条件的分析,而在古近系寻找披覆背斜大油田应注重储层和储盖组合的分析。

Oil-bearing horizons of the drape anticline oilfields in the Bozhong depression are mainly the Neogene Minghuazhen and Guangtao formations, and they are mainly distributed in structures such as salient and low salient. The Bozhong kitchen is the major hydrocarbon source for PL19-3,QHD32-6 and CFD11-1 oilfields in the Bozhong depression. The drape anticline oil/gas felds generally have the genetic features such as being adjacent to hydrocarbon kitchen, quality reservoirs, good reservoir-seal combinations, favorable structural locations and excellent carrier systems. In combination with the analysis of the factors resulting in the failure of exploratory wells on the salient and low salient structures, we believe that the analysis of hydrocarbon migration conditions is the key to searching for large drape anticline oilfields in the Neogene,while the analyses of reservoirs and reservoirseal combinations are the focus in the Paleogene.