Logging Evaluation Of Low Porosity And Permeability Reservoir Of Block Nai 1 In Liaohe Oilfield

With the gradually increasing demands of oil and gas and the deepening of exploration and development of oil and gas fields,conventional oil and gas reservoirs can no longer meet the needs of society and the development requirements of oil enterprises,so the exploration and development enterprises of oil and gas fields are facing more and more severe challenges.In order to find alternative sources of conventional oil and gas,low porosity and permeability oil and gas reservoirs have great development potential and have become an important target to replace conventional oil and gas.Based on reservoir classification criteria and data collected,block Nai 1 is a low porosity and low or ultra-low permeability reservoir.There are a lot of faults in this block,which make the structure of the reservoir very complex and make the evaluation of the reservoir more difficult.In the early development stage of block Nai 1,the logging technology level was relatively backward and the logging projects were relatively few,and the logging data interpretation method was also limited,so the logging data interpretation accuracy was limited.In order to evaluate the reservoir of this block better and provide more real data support for exploration and development,according to the specific conditions of this area,this paper is based on the well logging data in block Nai 1.According to the data of geological logging,coring analysis,testing and oil testing and through analyzing the characteristics of structure,stratum,reservoir and fluid in the study area,this paper corrects the environmental influence of logging data,standardizes logging data,analyses core and relocates depth.The detailed evaluation of the reservoir in block Nai 1 was carried out and the reservoir parameters interpretation model such as shale content,porosity,permeability,saturation were optimized.Then on the basis,the lithology,physical property,oil-bearing property,electrical property and lower limit standard were established.The interpretation module was compiled and implemented on the Forward platform for the fine interpretation of logging data and the original interpretation results of 69 wells were modified.According to the actual production situation of the working area and multi-well profiles,the oil-water distribution in the working area was clarified.The dominant pay zones in the block are mainly located in the high part of the structure and there are two sets of oil-water systems in the upper part of Jiufotang formation and three sets of oil-water systems in the lower part of Jiufotang formation.The application effect of each logging series is evaluated and suggestions for logging are put forward,which can provide reliable basis for the geological evaluation of the block in the future.