Study On Quantitative Prediction Of Structural Fracture Distribution Law Of Fuyu Reservoir In Xingshugang Area Of Songliao Basin

Xingshugang area is a part of Daqing placanticline anticline of the northern Songliao Basin,located in the central of Daqing placanticline struc ture,including the Xingshugang anticline,Taipingtun anticline,Gaotaizi anticline,Xinxi nose structure,Gaoxi nose structure,wherein the Xingshugang anticline is more complete,the axis is near NNW,trap line structure depth is-1380 m,trap area is147km2,shut height is 100 m,high spot altitude is-1280 m.Structural amplitude is developed greatly.The Fuyu reservoir in the study area is mainly shallow water lake delta deposition.According to the analysis of core samples,the effective porosity of Fuyu reservoir is more than 12% in the area,which proportion is 43.5%,the average is less than 15%,the air permeability is 0.1-20.4mD,and the average is less than 2mD,which is low porosity and extra low permeability reservoir.During many years' exploring,Fuyang reservoir of the study on the current development situation,a large number of oil and gas resources have not been developed,can be used as the Daqing Oilfield valuable reserves resources.In order to effectively utilize the reserves of Fuyu reservoir,it is urgent to study the fracture and ground stress,and to provide reasonable injection production well pattern.Based on finite element theory,study distribution laws of tectonic stess field in Xingshugang area by the numerical simulation,combining with comprehensive analysis of well logging,seismic,laboratory test and production data of core get distribution laws of tectonic fracture layer of,and calculate the porosity and permeability.Through mechanical analyses of structural fractures,seismic attributes,identification technology based on artificial neural network identificate and forecast fracture.A case of fracture prediction is studied and inspected.The results show that:(1)The trend of Fuyu reservoir's fracture is mainly NW,secondarily NE in Xingshugang area.(2)The main period of fracture formation is the end of qingshankou.(3)The maximum principal stress concentration in Fuyu reservoir is NE70 °.(4)The numerical simulation of the stress field is carried o ut in X71 block.Compared with the measured results,the error is less than 15%,and the simulation results are reliable.