Analysis of sand architecture and connectivity in lower member of Minghuazhen Formation in Bohai Sea
In the lower member of the Minghuazhen Formation in the shallow Bohai Sea,the sedimentary system is complex and diverse in types.The discovered lithological reservoirs are mainly developed in meandering rivers and shallow water deltas.The sand undergoes rapid lateral changes and complex contact relationships,forming a sand with complex spatial distribution and internal structure of reservoirs.Sand architecture and connectivity determine their development scale and distribution range and control the size of lithological traps and the hydrocarbon distribution degree.Based on core,logging,and seismic data,a detailed dissection of the sand architecture in the lower member of the Minghuazhen Formation in the shallow Bohai Sea was conducted,and a sand architecture model with a complex sedimentary system was established.The distribution and evolution characteristics of sand controlled by reservoir architecture were studied,and the internal connectivity of sand was analyzed.The results indicate that the vertical stacking relationship of meandering river sand includes independent type,superimposed type,and cut-overlap type.The planar stacking relationship is mainly dominated by lateral connection type,with strip-shaped distribution and development as the typical characteristics.The architecture elements of shallow water delta sand is mainly composed of distributary channels,mouth bars,and sheet-like sand.Vertically,they are mainly of butt and cut-overlap types.Horizontally,they exhibit branch,lobe,and sheet-like distribution and development.On the basis of analyzing the architecture style of sand,seismic,geochemical,and other data and methods were used.Combined with structural and sedimentary characteristics,the connectivity of sand was analyzed through methods such as superimposed sand pattern comparison,crude oil migration and filling analysis,and 3D seismic reservoir prediction technology,providing a reference for the implementation of shallow lithological traps and large-scale lithological exploration.
sand architecturesand connectivitymeandering rivershallow water deltashallow lithological reservoir explorationlower member of Minghuazhen Formation in Bohai Sea
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NSTL
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