Reservoir Logging Evaluation Of Badaowan Formation In Five Areas Of Karamay Oilfield

Through the previous research of Badaowan formation reservoir in fifth block of karamay oil field, combined with the drilling data, core data, logging data, mud logging data and test analysis, using a combination of research methods of geological methods and geophysical methods, I use multi-disciplinary, multi-means research methods and do the research of the reservoir logging evaluation in J1b5reservoir of Karamay oil field.The monoclinal structure dipping from the northwest to the southeast becomes the top structure of the reservoir, which is occluded by karamay fault and the southern baijiantan fault. The study section J1b5is divided into three sand groups, which is J1b51-3、J1b51-2and J1b51from bottom to top in short. The reservoir is mainly composed of fine sandstone, medium sandstone and conglomerate, and mixed with non-equal grain size sandstones and gritstones. Among them, fine sandstone, non-equal grain size sandstone and conglomerate act as the main reservoir lithologies. The reservoir property is poor, which belongs to low porosity and low permeability reservoir.Based on the logging data, mud logging data, test data and core data, the four-property relationship of the reservoir is studied. Through the comparison and analysis, the resistivity and porosity intersection method, Rt/Rxo and Rt intersection method, and normal probability distribution method have better effect on the fluid identification, and are used to establish the fluid properties interpretation standards. Meanwhile, using the experience in statistics and oil test point constraint method, the porosity lower limit value is determined as9.8%, the permeability lower limit value is determined as0.095mD, and the saturation lower limit value is determined as47%. Using the established interpretation model for quantitative processing of the collected logging data, combined with the reservoir validity evaluation results which identified by fluid property, the reservoir interpretation standards of the study area are established, and the effects of coring well logging interpretation are evaluated.Through the reservoir profile comparison and analysis of J1b51-1、J1b51-2、J1b41-3strata, it gets that in the profile, the oil content of the lower J1b51-1stratum is the best, which is mainly oil-water layer; Followed by J1b51-2stratum, which is mainly oily water layer. According to the physical property characters of the reservoir, reservoir thickness, pore structure parameters and oil-bearing occurrence, the reservoir classification evaluation standard is set up, and the reservoir is divided into four types, namely, Ⅰ, Ⅱ, Ⅲ, Ⅳ reservoir.Finally, on the basis of the single well explain characteristic control, combined with oil and water distribution, oil test data and the oil change rule showed by the reservoir well profile, referring to the adjoining well logging interpretation, geological analysis and the comprehensive analysis of production dynamic data, the favorable reservoir oil-bearing districts are set up, which are468well-J103well area,5905well-5911well area, J102well area and578well area, and the favorable section is J1b51-1.