Forecast Of The Structure And Lithologic Trap Or Shang2Block In Yudong Area

With the constant improvement in the exploration and development in Songliao Basin,constant progress in petroleum exploration technology and constant expansion of theexploration field, the objective of exploration has shifted from mainly looking for large scalestructural reservoirs to mainly looking for micro-range structural reservoirs and non-structuralreservoirs, placing emphasis on accurate structural description and lithologic reservoirs,because almost all large scale structural traps have been drilled, which means that theremaining oil and gas resources related to structural traps are decreasing, but the number ofnon-structural reservoirs that have been found has been on the rise with years and suchreservoirs have become an important oil and gas exploration field, especially in highly matureexploration areas, where looking for micro-range structural reservoirs, conducting accuratestructural description and forecasting lithologic reservoirs have become key points anddifficult points and provided important support for finding backing reserves to maintain thesustainable steady petroleum production.Using earthquake information reprocessed through amplitude-preserved high-fidelityimages, the structural drawings of the top surface (T2) of FI oil bearing layer, the top surface(T2Y1) of FII oil bearing layer, the top surface of YI oil bearing layer and the top surface(T2-2) of Quan2formation have been completed, the structure and fracture features ofShangjia Oil Field have been analyzed and the structure and fracture' control over themigration and accumulation of oil and gas, preservation of reservoir and the distribution of oiland gas has been studied, with the result showing that structure and fracture play a veryimportant role in the formation and preservation of reservoirs and the distribution of oil andwater.The accurate description of fractures is realized using software SVI, coherent datavolume and seismic attributive volume, and the relationship between fractures and reservoirsis analyzed through fracture nature, faulted horizon and fault throw; the seismic attributives ofpre-stack data volume, pure wave data volume and post-stack data volume is extracted,optimized and analyzed and meticulous depiction of the channel sand body in Fuyu oilbearing layer is given; the AVO pre-stack attributive inversion and pre-stack elastic inversionof Fuyang oil bearing layer are conducted to select the pre-stack inversion attributivessensitive to lithologic and petrophysical properties in the area and the sand stone, oil and gasin Fuyang oil bearing layer are forecast, which can help point out favorable direction for oil& gas exploration and development. Fuyu oil bearing layer is dominated by the subfaciessediment of the delta front, with3identifiable sedimentary microfacies types, the underwaterdistributary channel, the sheet sand and the interdistributary bay.