Reservoir Fluid Identification Method And Old Well Review Study In H Area

At this stage,with the development of conventional oil and gas,low-porosity and low-permeability reservoirs gradually enter people’s field of vision.The research block in this paper is the black 46-dry 134 block.This block is a key block for increasing reserves and production in Jilin Oilfield in recent years.The reservoir is a low-porosity and ultra-low permeability reservoir with strong heterogeneity.The pore structure of the reservoir is complex,and the oil-water relationship is complex.Affected by the control of multiple provenances,the large variation of formation water salinity on the plane,the large drilling time span of new and old wells,the inconsistency of logging instrument models and logging series,and inconsistent interpretation standards,the recognition coincidence rate is low in the reservoir formation.The main development horizon in the study area is the Qing 1 member of the Gaotaizi oil layer,and there are Quan 4 Member,Qing 2 Member,Qing 3 Member,and Yao 1 Member.Among them,Qing 1 Member and Qing 2 Member have similar accumulation background conditions,and Quan 4 Member is a tight oil reservoir.Exploration in recent years shows that the oil layers in the Qing 2 Member have a tendency of continuous distribution on the plane,and the Quan 4 Member is scattered.Up to now,there is no overall understanding of between Qing 2 Member and Quan 4 Member,especially in terms of oil layer identification of Qing 2 Member,the overall understanding is relatively low.In view of the geological and reservoir problems existing in the study area,the technical research on fine logging interpretation methods based on petrophysical research in the study area,the main controlling factors of the logging response of oil and water layers have been clarified.Establish logging interpretation methods and models for oil and water layers based on the main controlling factors and improve the logging interpretation capabilities of oil and water layers and tight oil reservoirs in key areas of the study area.To develop a set of logging evaluation methods for tight oil reservoirs in the Qing 2 and Quan 4 members in the Daqingzijing area.The secondary interpretation of the logging data in this area is carried out,and the old well testing suggestions are put forward.Improve the coincidence rate of logging interpretation of oil and water layers,and then identify the distribution characteristics of potential areas.There is a discrepancy between the logging interpretation of the old well and the oil test results,which needs to be re-understood.Based on oil testing and accumulative production data,carry out research on the identification method of oil and water layers in tight oil layers.It is necessary to deepen the fluid identification method,establish a reasonable and practical standard,and apply it to the review of old wells and the study of reserve parameters.