Prediction Of Single Sand Body And Horizontal Well Deployment Of Putaohua Oil Layer At Xu30Block In Yushulin Oil Field

Yushulin oil field belongs to the central depression area in Sanzhao depression of Songliao Basin on the geological structure, and it’s a large-scale and low permeability oil field in east area of Daqing placanticline in North Songliao Basin. Xu30block is located in the southwest of Yushulin oil field, and Putaohua reservoir is the main reservoir.The thesis, based on sequence stratigraphy, reservoir sedimentology, seismic stratigraphy and other related theories as well as the use of logging datas, core analysis datas and seismic datas, through analysis on the sedimentary background and sedimentary envoironment of Putaohua reservoir at Xu30block, makes fine structural interpretation of the study area, builds isochronous stratigraphic framework of Xu30block, and determines the types of sedimentary microficies for thorough analysis of plane sedimentary microfacies of depositional time units, and the distribution characteristics of single sands, oil-water distribution law and the developed areas of favorable reservoirs. All these work will be a reliable basis for the design of horizontal well trajectory at Xu30block in Yushulin oilfield, and this thesis uses the modeling technique of3D structure for the final proposal horizon of horizontal wells.Based on the detailed analysis of sedimentary microfacies, the thesis determines that the Putaohua reservoir of Xu30block is large river-dominated shallow-water delta, mainly for the delta front subfacies, and it can be divided into underwater distributary channel, seat body, sheet sand, the inner front sheet sand and the external delta front sedimentary microfacies. According to the logging facies elements, logging facies model of5microfacies is developed. The research district mainly has the north and the northeast sediment sources on analysis of datas such as heavy mineral combination, ZTR index, mudstone color, sand ratios and so on. The study area has good physical properties on the whole, and underwater distributary channel, seat body and sheet sand are the most favorable reservoirs. The distribution of oil and water is complex under the control of faults, and it generally presents the top oil-bottom water phenomenon.