Reservoir Study In The Second South Western Block And Optimization Of Well Spacing Scheme In The Undeveloped Block Of Transition Zone

Exploited for many years, Daqing oil field has gradually came into the stage of containing more water. Because reservoir anisotropism makes remaining oil distribute highly decentralized, reservoir prediction become more and more difficultly. The study is to exploit available remaining oil, and make a deeper understanding of the character of structures and reservoirs in study area. Through qualitative and quantitative description of structure, reservoir fluids, to provide reliable geological basises to numerical reservoir simulation as well as the development and deployment, also aware reservoir dynamic law intuitively which providing technical support to resolve remaining oil development work in the late high water period.The research is carried out in the background of high density seimic data of South Middle East Block of Lamadian filed. Basing on the idea of well and seismic combination, the following studies have been developed:①Precise seismic interpretation of well-seismic combination:in the whole region, with the idea of combination of drilling-logging-seismic, with five practice and recognition of point-line-surface-room, the reliability of the seismic interpretation layers are ensured. The fault interpretation mainly bases on breakpoint in wells, combining with the coherent cube, inclination attributes, azimuth attributes and other technical means, the reliability of fault identification is settled.②Inversion prediction of reservoir reconstruction:basing on the depositional characteristic of study area and sand distribution, the inversion based on the frequency compensation is used. The distribution, contact relationships and connectivity of the sand body between wells are predicted.③Well-seismic combination sedimentary microfacies study:Mainly based on seismic sedimentology principle, by analyzing drilling lithology and electrical response characteristics, contrasting curve rhythm and cyclicity, describing well point microfacies characters quantitatively, combining with seismic inversion and seismic facies achievements at the same time, and finish the sedimentary facies research finally.④Three-dimensional geological modeling:Mainly based on the basic principles of geological modeling, integrated geological, seismic, logging and dynamic data, to establish a digital model of the dimensional changes reflect the geological characteristics and distribution.⑤Drive numerical simulation study: According to the basic principle of numerical simulation, by history matching geological reserves, the moisture content, the amount of fluid production, the remaining oil distribution, design well spacing program, and according to their forecast development indicators and economic principles to select the optimal well spacing program.Studies have shown that:In study of reservoir, horizon calibration are fine to single river deposition unit, which realize the study of sedimentary microfacies in well-seismic combination. For the less transition region logging data, the application of three-dimensional seismic data constraints on the structure, thickness, and logging data, sedimentary facies diagram combined to establish the South West of District transition zone geological model; And various development parameters obtained by history matching, appeal study to determine the optimal well spacing program to provide technical means to solve the late high water cut reservoir remaining oil development and theoretical basis.