霸县凹陷文安斜坡内带层序地层学研究

Study of Stratigraphic of Down-slope of Wenan of Baxian Sag

以文安斜坡内带深层为研究对象,应用高分辨层序地层学等方法研究识别隐蔽油藏。通过兴隆1井地层重新划分及高分辨率三维地震应用,将该区沙三、沙四段地层之间重新确定为不整合接触。在三级层序地层框架建立的基础上,刻画各体系域砂体展布特征,构建了坡折带控制沙四下自生自储岩性油气藏成藏模式。通过钻井实践,首次在霸县凹陷发现沙四下段含油层系及新的烃源岩层,实现了深层自生自储式油藏类型的勘探突破。

This study presents an integrated approach that has been successfully used in delineation of subtle traps reservoirs in the down - slope of Wenan of Baxian sag. First, sequence stratigraphic analysis is carried out from well Xinglong 1, the boundary between the 3rd and 4th Members of Shahejie Formation is recognized as unconform- ity and the straitgraphic - sequences framework is reconstructed on the high - quality 3 - D seismic reflection data. Then, the necessary analysis of slope - break control effect on layers, facies, sandstones and reservoirs is per- formed, and the corresponding sequence developing modle and vertical evolution modles adjacent to slope_break is suggested. Finally, the exploration result convinces the research analysis. The new exploration target and new source rock of low 4th Members of Shahejie Formation of down - slope of Wenan are revealed. This study also has implications for potential reservoir geometries and hydrocarbon on similar deoositional environment.