| Fractured reservoir is one of the most difficult reservoir types in the process of oil exploration and development, fractured reservoir distributes very wide in our country, proven reserves and accounts for about one-third of the volume, with increased exploration, the proportion will increase year by year, the production of oil and gas production in China occupies a very important position. However, as a result of fractured reservoir with low porosity, non-homogeneous and complex distribution , making the development of such reservoirs has become the recognized world oil problems, the key question of its development is the study of natural cracks, a comprehensive and accurate understanding of distribution included of the cracks geometry, geological parameters and flow characteristics is the basis of development effectively fractured reservoir. This study pointed to Putaohua layer of XinZhan oilfield of Daqing for an example, from the development of geology, reservoir geological model, the characterization of cracks and modeling, reservoir engineering, the current pattern of adaptation and residual oil distribution and adjusted the program design systematically expounded fractured reservoir description and remaining oil distribution.Finishing in the collection of geological characteristics of the XinZhan oilfield based on the results of research, to reservoir and fracture in the main lines, carried out detailed reservoir description, first, according to the standards of dividing sedimentary microfacies , Putaohua will be divided from the original layer small layer of the eight sub-divided into 12 sedimentary units; Second, it analysed small faults and isolated breakpoint, and compiled top and bottom of reservoir group structural map; Third, it analysed the core characteristics of natural fracture distribution, and combined with conventional logging , passive micro-seismic interpretation of the results and dynamics reflect of crack in the process of developing water , established a conventional logging crack discriminant model, cleared distribution of the cracks.On the basis of above reservoir and cracks study, to three-dimensional geological model of the dual media and residual oil distribution in the main line, launched a multi-disciplinary research, first ,on the basis of the structural model, phased model and attribute model phased, carried out a digitization and visualization description of fracture zone and the scale ,the results showed that the laws of fracture was business of distance from wells to fault,palaeostructure deflection factors, etc, and established the 12 sedimentary unit crack model; the second is based on three-dimensional geological model ,through reservoir simulation methods adopted, combined with static and dynamic single well split the results of single-layer, comprehensive described residual oil; three is based on the results of residual oil distribution, in order to make use of the cracks and avoid risks, optimized the irregular block encryption scheme in DA401 block, deployed encryption of 70 wells, 23 injection wells, recovery is expected to 31.74 percent, than the pre-encryption increased 5.89 percentage points.The paper based on the geological characteristics of the natural fracture in reservoir, to resolve the current oilfield water-flooding development problems and contradictions for research purposes, by means of computer technology, closely focused on the core issue that "acquaint the residual oil, exploit the residual oil" synthesized to geological,logging,dynamic production and multi-information, etc, using the integrated research ideas of the geological development, combined with static and dynamic materials,from qualitative to quantitative, mutual authentication, each other to promote, formed the research ideas and techniques methods of fractured sandstone reservoir description, and the remaining oil distribution and potential, for the exploration and development of similar provided exploratory research.
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