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Study On Log Evaluation Methods Of Fractured Dolomite Reservoirs In ES4in Leijia Area

Posted on:2015-08-05Degree:MasterType:Thesis
Country:ChinaCandidate:Y N ZhangFull Text:PDF
GTID:2180330431495205Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
With the increasingly in-depth exploration and development of oil fields, fractureddolomite reservoirs has been paid more and more attention. The key object of this study is thedolomite reservoirs of ES4in Leijia Area. Pore spaces of these reservoirs are very complex,and identification of fluid properties is difficult.Lithology, physical properties and pore spaces of dolomite reservoirs in ES4in LeijiaArea are studied with statistical methods of histogram or others based on coring, oil testingand log data, and it draws conclusion that lithology of the reservoirs mainly consists of shalydolomite, and their porosity and permeability is lower, and pore spaces are composed offracture and pore. With experimental data and log data of fractured dolomite reservoirs of ES4in Leijia Area, parameter interpretation models is established to calculate shale content,matrix porosity, matrix permeability, fracture porosity, fracture permeability and so on. Afterconsidering water conduction in matrix pore, mud filtrate conduction in fracture, and excessconductivity of shale in fractured dolomite reservoirs, a new conductivity model is establishedwith the connectivity equation and mixing law for fractured and porous dolomite reservoirs inES4in Leijia Area. After analyzing the effects of conductivity exponents of matrix phase,fracture phase and clay phase, fracture porosity, matrix porosity and water saturation infracture on conductance rule predicted by the proposed model, it found that formationresistivity increases as conductivity exponents of matrix phase, fracture phase and clay phaseand water saturation in fracture increase, it decreases as fracture porosity and matrix porosityincrease. The log data in ES4in Leijia Area have been processed with the proposed model,and the results are nearly consistent with oil testing. Distribution of porosity and permeabilityof the dolomite reservoirs in ES4in Leijia Area is plotted, and the graphs illustrate that thelocation of optimized wells are consistent with the practical production. The results show thatreservoir parameter interpretation model and connectivity conductivity model can be appliedwell in log interpretation of the fractured and porous dolomite reservoirs in ES4in LeijiaArea.
Keywords/Search Tags:Leijia area, fractured and porous reservoirs, reservoir characters, reservoirparameter interpretation, connectivity theory, conductivity model
PDF Full Text Request
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