Fine Structure Interpretation And Potential Reservoir Distributionof The Member3of Shahejie Formation In The South Of Huan Xiling Oilfield, Liaohe Depression

Jin31-Jin146area is located in the south of huanxilin oilfield of liaohe depression.Andthe fractures of the target bed-the member3of Shahejie formation include complex faults.And the small faults are often seen.Because sublacustrine fan deposit which possesses gravityflow property is the sandstone sedimentary, the drastic lateral variation and poor continuity ofreservoir sandbodies exists. By jointly controlling of fracture and lithology,the distributionregularity of reservoir is difficult to grasp.In order to point the direction of the nextexploration and production of oil and gas,it is necessary to carry out fine structureinterpretation and reservoir prediction.Through drilling,logging,logging and dynamic data analysis and guiding of the sequencestratigraphy, tectonic geology,the member3of Shahejie formation is divided into five oilreservior groups-ReⅠ,ReⅡ,DaⅠ,DaⅡ,DaⅢ in this paper.On the basis of establishingsequence stratigraphy framework and from the calibration of horizon,we have completedcomposite traces of104wells,described25faults and mapped the structure of the upper andthe lower surface of the5five oil reservior groups by using the seismic interpretationtechnology such as level slice technology,coherent cube technique,varying velocity mappingtechnology and so on.Structural features analysis shows that this area has NE-NEE-and nearlyEW-trending faults,and the backbone faults are NE-trending faults,and NEE-and nearlyEW-trending faults are from the backbone faults.These faults form a series of break structuralnosef and block tectonics.Because the reservoir which has features of deposition from gravity flow is hard topredict, appling JASON inversion software, reservoir inversion is firstly applied by usingCSSI techology in this study area. The result of the study shows that in vertical direction, theoil reservior groups-Re Ⅱ,Da Ⅱa nd Da Ⅲare the importance areas for reservoir sandbodiesdevelopment.And in literally, the sandbodies of DaLingHe reservoirs are mainly distributed inthe Jin2-6-9block and Jin24block, the sandbodies of ReHeTai reservoirs are mainlydistributed in the Jin2-6-9block and Jin29block and the south of Jin136.Overall,sandbodiesare mainly in the declining plate of fault.And it has geological laws of "fault controllingsand".Based on research above and in combination with oil testing data,oil-gas distributionlaws are comprehensively evaluated including source rocks, reservoir rocks, seal rocks, traps,migration, perservation and so on.Finally, two favorable blocks for drilling well distribution have been determined in thestudy area and three wells have been deployed.