Study On Low Resistance Reservoir Of The Bin648, Bin649in Binnan Oil Field

Study area belonges to the Binnan Oilfield, which is located in the northern edgeof Dongying Depression, north coast of Binxian preiection, east of Lijin sag oilgeneration, belonging to Jin Binnan－Lijin fault of the western part of the structure.The exploration area is about200km2. In study area, Bin648, Bin649oil-bearingstrata are Shahejie three section, Shahejie four section, and their main strata is Shahejiethree section.Study area is characterized by fine lithology, high irreducible water saturation,small porosity, relatively low resistivity reservoir, difficult logging fluid identification;and study area is mainly comprised by glutenite reservoir, with the problem of complexlithology, small differences in oil and hydropower, complicated oil-water relationshipand imperfect existing logging series.Based on the study of the "four relationship reservoir" of Bin648and Bin649, it isrecognized that high reservoir formation water salinity, fine lithology and high boundwater content are the main cause of low resistance phenomena in the research work area.For low resistivity reservoir characteristics there, a adaptive reservoir parameterscalculating model was proposed, including the calculation models of shale content,porosity, permeability, water saturation and irreducible water saturation. According toactual production data partition blocks and intervals, an electrical property criteria ofreservoir physical fluid property was established to help identify the low resistivityreservoirs in study area. A recognize practice re-recognize re-practice processis well needed in the low resistivity reservoir logging interpretation, therefore, there-examination of old wells and oil testing of low resistivity reservoir low limit shouldbe strengthen in the development and potential tapping of maturing tracts. During lastyear,16new wells have been drilled, in which13wells have been put into operation inresearch work area, and have meet the requirements according to the new establishedcriteria evaluation. After secondary fine evaluation on63wells of two blocks inresearch area, oil reservoir in Bin648has been lifted26floors by156.3m and oil-waterreservoir has been elevated5floors by19.9m, while in Bin649, oil reservoir has beenlifted58floors by235m and oil-water reservoir has been elevated26floors by102.6m. In the selection of the logging series in research work area, the attention should bepayed to the unification of the electrical logging series in the same block; when facingthe complex lithologic section like glutenite, it is recommended to take compensateddensity and compensated neutron as the necessary items. Besides, NMR and Multipoleacoustic (MAC) measurements are also tested in key wells to acquire a rich geologicaland engineering solution techniques.