Favorable Block Prediction Of Putaohua Oil Layer In Songliao Basin Zhao404Well Block

Wellblock of zhao404belongs to zhaozhou oilfield of songliao basin,because ofputaohua reservoir buried depth, thin reservoir,wellblock has some problems such aslow overall evaluation grades,insufficient reserve building blocks at present.Therefore,make full use of geological,geophysical and log data,based on theestablished sequence stratigraphic framework,focus on the research of structuralanalysis, sedimentary evaluation and reservoir prediction,combined with the results ofpetroleum entrapment research,optimizing the advantageous developmentblocks.Results are as follows:(1) Using three-dimensional data for fine structure interpretation.Work areamainly developed two sets of faults, a set of north and south direction, a set ofeast-west direction, displaying a characteristic that east-west faults cut the south-northfaults.(2) Putaohua oil layer belongs to the delta front sedimentary environment.Thereare four types of sedimentary microfacies, respectively are submerged distributarychannel,estuary bar,sand sheet and front mud. In wellblock,the microfacies dominatedby submerged distributary channel deposits and sheet sand deposits. There are threeunderwater distributary channels develop under PI group, and two underwaterdistributary channels develop on the top of the PI group.(3) Using combined with geostatistics inversion of seismic trace inversionmethod, predict the distribution of sand body accurately.Overall Putaohua reservoirsand body distribution has the characteristics that the sand body in the north and westis thick and the sand body in the south and east is thin.The sand body under PI groupshows a strip shape distribution and the sand body on the top of PI group showspotato shape distribution.(4)In combination with characteristics of reservoir and the mainly controlfactors,ultimately selected three favorable blocks:respectively is Zhao41-52block,southwest of Zhao deep6block and the south of zhao51-59block.Among all of thethree blocks,the Zhao41-52block is the most favorable blocks in reality.