Geological structure and its significance for petroleum exploration of fault structural layer in the Muguangying area,Xihu Sag
The Xihu Sag is the largest hydrocarbon-rich sag in the East China Sea Shelf Basin,and the Baochu Slope located in the western part of the sag is the main area for petroleum exploration.Recent practices have shown that the deep structural-lithological field of slope has good exploration prospects.Conducting an analysis of the geological structure and petroleum exploration potential of the deep fault structural layer in Muguangying area is of great significance for clarifying the favorable breakthrough direction in the structural-lithological field of the Xihu Sag.This study comprehensively utilizes high-resolution 3D seismic and drilling data to carry out detailed structural and stratigraphic interpretation in the Muguangying area.Based on the interpretation results,burial-thermal history of the study area is simulated,and the petroleum geology conditions are analyzed systematically.This study shows that the Muguangying structural belt is featured by an eastward dipping slope,with a Paleocene thickness center locates in its northern part.Three sets of faults with NE,NNE and NW striking directions develop in the study area,most of which were active from the Paleocene to Eocene,and their activity intensity gradually weakened.The residual thickness of the Paleocene in the Muguangying area is 200～1 500 m,of which the thickness of dark mudstone is 100～700 m,with a maximum thickness exceeding 700 m.The main body of the dark mudstone entered mature stage during the sedimentary period of the Baoshi Formation.Multiple layers of thick sandstone are developed within the Baoshi Formation,which have good physical properties and can serve as favorable reservoirs.The results demonstrate that the Muguangying area has suitable source-reservoir-cap assemblage and effective source-reservoir configurations,making it a favorable direction for further exploration in the structural-lithological fields of the Baochu Slope.
万方数据
维普
