Oil And Gas Migration Path Of Shahejie Formation In Boxing Area,Dongying Depression

According to the exploration practice and previous research results of Boxing Subsag,the oil and gas distribution and migration rules of Shahejie Formation in Boxing Depression are analyzed though the distribution of source rocks and oil,characteristics of transport system,based on oil-source correlation and HMIE index.The disserataion has achieved the following conclusions:(1)There are two types of source rocks in Boxing Subsag,the first was weak redox environment of fresh water,the second one was strong reductive environment of saline water.Reservoirs are mainly distributed in Es3 and Es4,mainly including structural reservoirs and composite reservoirs.Structural-lithologic reservoirs are the main reservoirs in sag zone,fault reservoirs are the main reservoirs in slope zone,and overlap reservoirs are the main reservoirs in uplift zone.(2)Oil and gas in uplift zone migrate vertically through deep and large faults which are connected with source rock,oil and gas in depression zone migrate through Y-type faults and fractures to form reservoirs in sandstone lens,and oil and gas in slope zone migrate through stepped faults and transverse effective sandstone.(3)Boxing fault in slope zone is the main channel of oil from Es4 source to Es2 and Es1.For mixed oil of Es1 and Es2,the oil from Es3 source in slope zone first migrates vertically to Es2 and Es1 through Fanjia fault,and then migrates horizontally in the transverse sandstone of Es1 and Es2,finally mixes with Es4 source oil to form reservoirs in the area of Boxing fault and Jinjia fault.