The Research Of Sedimentary Characteristics In Yi 123 Block?Yi944 Block Of Bonan Depression

South bohai oilfield is mainly controlled by the tectonic block-lithologic reservoir.It is divided into 11 area,And this topic main research object is righteous 123 block in the north of sha 3 section in the middle of nine sand group and 944 wellblock four sand group.9 sand group is the turbidity current deposits formed under the deep lake,composed under the composite muddy water way,There are 4 subfacies sediment.Upward along the north and the west,the turbidite fan edge distribut the edge of the channel,So they formed a typical textural maturity and compositional maturity under the condition of low sand deposits under deepwater.4 sand group is fan delta front deposits under the condition of shallow water-bathyal.The whole sand body into a strip stretch from south to north west.the composite underwater distributary channel in the form of a merger or in the shunt way extending from south to north,the north west with ribbon.At the edge of the distributary channel sand body distribute the distributary channel microfacies.The main sand body of fan delta front are distributed in the front of the distributary channel sand belt.So complete fan-delta does not appear before,and in the study area of sand body and thin belt,it maybe the activity of sedimentary fracture or fault activity make the sand body thin or missing in the late.All of them mainly come from gudao uplift.the original interstice of 9 sand layer is multiplicity filled.But due to the influence of carbonate minerals,Better physical property have appeared in deep layer properties.So the 9 sand group a product of the mid late diagenetic.The diagenetic of 4 sand group is stronger,Buried deep,strong compaction.The padding is mainly argillaceous of mixed base.So 4 sand group belongs to the product of early late diagenetic stage.According to the core physical property analysis,Physical propertyof 9 sand group and 4 sand group were variation from south to north,This is consistent with the lithology changes.9 sand group and 4 sand group reservoir type can be divided into the following types:Vertical seal of fault lithologic reservoir?Sand body updip pinchout reservoir?The lens reservoir.The formation of the reservoir is mainly controlled by lithology,that is The lithologic reservoir.So that reservoir development is mainly affected by the nature of the channel sand body and space distribution.Including sand body size?The sedimentary facies?Physical properties?Lithology and hydrocarbon source area of the contact.The boundary of the reservoir is sand pinchout line or physical changes.9 sand group still has great development potential,According to the supply conditions of sand body and the extension of water channel,Can continue to trace back to the waterway.Because 4 sand group development in all regional,Although affected by fault,But overall there have two thick sand bodywith south west-north east.So 4 sand group stored in the reservoir is very optimistic.