Potential Reexamination Of The Medium-shallow Strata Of Exploration And Evaluation Wells In The Southern Slope Of Mahu

In order to achieve stable production and increase production in the southern slope of Mahu,it is necessary to the potential reexamination of the old oil wells,and the comprehensive evaluation of oil and gas potential of old oil wells is an important content of reexamination.In this paper,the Baijiantan Formation in the middle-shallow strata of exploration and evaluation wells in the southern slope of Mahu as the main research object,The comprehensive evaluation method of oil and gas potential is studied by comprehensively utilizing geological,gas logging,logging and oil test data,and the missing potential layers of old wells is reexaminated.In this paper,drilling data of the research area were collected,and data of 132 wells in the research area were obtained.The research work included the following aspects.Firstly,study on optimization of potential oil and gas layers.The logging data of key wells were standardized,and the comprehensive histogram of each well and the large sections of connected wells were established.Combined with the statistical big data analysis of tested oil wells,the typical characteristics of reservoir gas logging and logging sensitive curves are revealed,and the stratum and potential sand bodies of test wells and evaluation wells of different reservoirs are further carefully compared,and the target layer is proposed.Secondly,according to the conditions of the study area to carry out gas logging and logging model research,establish their own value layer criteria.Based on the analysis and mining of the original gas logging data in the perforation section of the target layer,the obvious discrimination effect of hydrocarbon phase coefficient Uh and gas logging oiliness index Qs on reservoir value is revealed,so the gas logging chart and interpretation standard are established,that is,Uh>0.758 and Qs>0.174 are the value layer,otherwise,they are non-value layers,and the chart is verified by used the back judgment interpretation.In addition,according to the logging core data,the reservoir characteristics of the study area are analyzed,the "four properties" relationship of reservoir is studied,the logging interpretation model of shale content,porosity content and saturation content parameters are reestablished,and the reliability of the model is verified.On this basis,the lower limit standard of effective thickness of valuable strata in the study area is determined by means of oilbearing occurrence method and oil-layer drawing method:RT?24 ?·m,Por?8.5%,So? 40%.Thirdly,according to the above research methods to the potential reexamination of the old wells in the target layer,and a total of 5 filling holes and testing wells are found,with 7 potential layers,and the range of sand body distribution in the potential layer was verified.The results obtained in this study have certain reference and practical value for improving the petroleum geological understanding of Baijiantan Formation in the southern slope of Mahu,as well as the stable production and increase production of oil and gas in the block.Figure[44]Table[18]Reference[90]...