Research On Residual Oil Distribution Regulation After ASP Of The East Blocks In Sa Er Tu

Wells in the study area is located in the north zone of Sa Er Tu east blocks Bei Er Xi,in 1964 put into development, has gone through the waterflood and chemical flooding,well history is more complex. Has entered the high water cut stage, development stage and adjust the main task is to find the remaining oil, residual oil extraction. ASP flooding exploitation II reservoir, succeed and achieve sustainable development of production,understanding the secondary oil and residual oil distribution and use of the situation,guiding the secondary oil take appropriate technical measures to tap the potential of remaining oil fine, adjustment of oilfield development plan formulate corresponding measures for stimulation of important guiding significance.The study is based on understanding of the Bei Er Xi geological features and deposition on the purpose of the test area layer(SⅡ10 + 11 a, SⅡ10 + 11 b, SⅡ12) the original boundaries were finely layered strata checked. Through the study of sedimentary characteristics of the test area to determine the sub-type of each phase and the micro-phase deposition unit, established three kinds of micro-phase mode with logging, use the logging sedimentary facies model for each unit of the logging facies identification draw a diagram of each sedimentary facies sedimentary units. The study area to identify micro-amplitude structures quadratic trend surface residual value method. At the macro from within the layer, interlayer and flat three aspects of reservoir heterogeneity, divided into three mobile units. Overall control of the remaining oil factors were studied in detail.Static and dynamic history matching reserves and its comprehensive analysis, the distribution of the remaining oil: three small layer of chemical flooding SⅡ12 maximum remaining oil, followed for SⅡ10+11b, SⅡ10 + 11 a is the minimum.After Chemical flooding SⅡ12 layer remaining oil is still the largest, followed by layers of SⅡ10+11a,SⅡ10+11b layer is the minimum. Whether chemical flooding or waterflood residual oil at different stages were mainly distributed in the connectivity of good river, reservoir overflow poor little residual oil sand shore, forming a structural high residual oil-rich region.