Integrated Logging Interpretation And Potential Analysis On Block Of Qian 153

The Qian’an Block 153 of the Jilin Oilfield is located in Qian’an County,Songyuan City,Jilin Province.The regional structure is located in the central part of the Changling Depression in the southern part of the Songliao Basin,at the southern dip of the Qian’an Formation.The area has not yet carried out a unified fine stratigraphic comparisons,sedimentary micro-phase study-based static reservoir description study,which seriously restricts the internal comprehensive management of the block and external rolling expansion exploration,and fine reservoir description work is imperative.In this thesis,through the fine stratigraphic delineation and comparison of each minor layer of the XII sand group in the third section of the Qingshankou Formation of the Qian 153 block,sedimentary micro-phase studies and secondary interpretation of logs for each minor layer are carried out,and on the basis of the above studies,potential analysis of the block is carried out.On the theoretical basis of high-resolution stratigraphic stratigraphy,a stratigraphic grid was established by comparing five substrata and six boundaries of 116 wells in the study area in a holistic,uniform and refined manner.The 39 and 40 minor layers were also divided into four single sand bodies,39.1,39.2,40.1 and 40.2.On the basis of data standardisation,core homing and other pre-processing of logging data,porosity,permeability and other laboratory analysis data as well as test oil and test production data were integrated to analyse the physical characteristics of the XII sand group in the Qing-San section,and to establish an interpretation model for mud content,porosity,permeability and water saturation;to establish acoustic time difference and electrical criteria for the effective thickness of the oil formation;Based on the results of comprehensive interpretation of logs,combined with the data of oil test and production,sand body plan spreading and tectonic feature spreading,the effective thickness map of oil layer was drawn;BP neural network was used to predict the oil layer,and the prediction accuracy reached 77.42%;Analysis of the depositional environment and sedimentary evolution patterns in the study area,and single well phase analysis of coring wells to implement subphases and microphases(submerged divergent channels,inter-submerged divergent channels,estuarine dams,distal sand dams,submerged divergent channel flanks,matted sands)in the delta front of the study area;a comprehensive analysis of the lithological characteristics,single-well phases and continuous-well phases reflected in the logging curve patterns of 116 wells in the Qian153 block was carried out,and the sand thickness maps and sedimentary microphase plan spreads of layers 38-42 of the Ⅻ Sand Formation in the Qing-San section of the study area were drawn in conjunction with regional geological data.Based on the production situation of the production wells,high-quality reservoirs were identified;the superimposed structures and sedimentary micro-phases were mapped,and favourable areas were circled;in accordance with the concept of "rolling deployment and benefit evaluation",well encryption was carried out internally and margin expansion was carried out externally to increase recoverable reserves and expand production capacity,and advice on well deployment was given.Based on the reservoir description results,combined with the production dynamics of oil and water wells,a total of 5 wells of 13 layers and 21 meters were recommended for hole filling,5 wells were recommended for margin expansion and 5 wells were recommended for injection transfer.