Favorable Areas Optimization And Reservoir Geological Evaluation Of Shahezi Formation,SW8-SW10 Well Block,Qikeshu Oilfield

Taking Shahezi formation reservoir of SW8-SW10 well block in Qikeshu oilfield for example,based on theories of sedimentology,structural geology and seismic stratigraphy,drilling,logging,oil testing and all kinds of static and dynamic data,fine stratigraphic correlation,fine structural interpretation,technology seismic multi-attribute analysis,logging constrained inversion and phase control modeling technology,the oil-bearing sandbody distribution,reservoir type,reserve scale and the geological characteristics of the research area are figured out,and 3D fine geological model of Shahezi formation reservoir is established after stratigraphic division and correlation,fine structural interpretation of target layer,research of reservoir characteristics,what's more,potential areas which can increase reserve and production are brought up.Main research results are as follows,(1)Shahezi formation can be finely divided into 4members,10 small layers and 14 sand bodies,thereinto SH1~2?SH1~3?SH2~3 are main layers;(2)the distribution of sand body,reservoir,and interlayer is figured out according to division standard which is established by four-property relation,and the reservoir is of medium-thick thickness,low porosity and permeability with analysis of reservoir characteristics;(3)after core observation,analysis of logging,seismic and the actual fracture monitoring data,the fractures show uneven distribution,and direction of the main formation stress is north by east,±NE55°;(4)the oil-water relationship and reserve scale of Shahezi formation is figured out,and the reservoir is structural-lithologic reservoir;(5)according to production test and productivity evaluation,this area is of medium-low reserve abundance and productivity,and there is great difference among well sites.(6)3D fine geological model is established,and three blocks are chosen to be potential areas,including Block C(rolling development evaluation block)and Block SW10(reservoir evaluation block).The research lays a foundation for the development of Qikeshu oilfield,establishes fine geologic model of similar reservoir,and offers methods of optimization of favorable potential areas.