Reservoir Description And Distribution Of The Remaining Oil Of Wen 13xi Block In Wendong Oilfield

Wen 13 West Block is the main unit of S3 M reservoir,lying between two sets Salt stone(W9 and W23)of WenDong oilfield,Zhongyuan.It is a typical deep high temperature,high pressure,low permeability and complex fault block reservoir in China.Since it was formally put into waterflood development in 1987,after years of high-speed development and multiple injection and adjustment,it has entered the stage of post-high water-cut development.There are some problems in the development such as unclear understanding of local structure,large difference in use between floors,and scattered residual oil and so on,water flooding development results showed a deteriorating trend.Therefore,we carry out the detailed description of the oil-bearing reservoirs in the ultra-high water-cut period and clarify the distribution characteristics of the remaining oil.Based on this,the study of development and adjustment techniques is of great significance in further improving the water-flooding recovery of the block.Based on the previous studies,using the newly acquired 3D seismic data and drilling,logging data,development structure and sedimentary microfacies research with different blocks;combined with the characteristics of reservoir,geological reserves were given;Based on analysis of reservoir engineering,using phase control model,description of remaining oil distribution quantitatly.By hte research,we straightened out the series of East drop small faults of Wen 13 West simple block and recombined and corrected multiple small faults in the complex belt for making it more regular.After the salt stone of Wen 23 was been modificated,the West complex area increased.The study shows: the S3 M sedimentary environment is delta front subfacies,mainly the distributary channel,river flank,far sand dam;inlayer heterogeneity is weak,the plane and interlayer heterogeneity is stronger;remaining oil distribution lies on complex plane area,high position and fault block position,the first and second third layer distributed vertically.The next step is improving the producing degree of reserves and control degree of water flooding in the area of complex structure,by the efficient adjustment and the consummate of injection and production.In the area of simple structure,strengthen the optimization of well pattern the adjustment of wells with injection and production,for the first layer,we sparse well network appropriately,at the same time,reduce well spacing of injection and production,to improving the classification of reservoir water drive degree.