Study On Poor Hydrocarbon Accumulation Complicated Fault-Block Reservoir Characteristics

Complex fault block reservoir is cutting by numerous faults and formed fault block traps. The reservoir is complicated, mainly developed in the tensile fracture basin and tectonic background complex fault zones, such as the North Sea Basin, Suez Basin, Gulf of Mexico Basin, Subei Basin and Bohai Bay Basin. They are such complex fault block reservoir development and distribution areas. The exploration and development of our country through decades, has been in the east rift lacustrine basin exploration and development of oil and gas reservoirs of the large number of complex fault-block group, a high proportion of such reserves of oil and gas reservoirs. China is the only country in the world to study complex fault block oil and gas reservoirs as an important Reservoir types.The Kaiyang-Kaitai fault block of Baiju oilfield is located in Xinghua City, Jiangsu Province. It locates in northwest slopes Yangxin subsag of Baiju sag, Subei Basin. It with a complex structure, coupled with the low permeability and high condensate reservoir. Although conventional water injection the fracturing into production, it still showed a low-yielding inefficient state. Constraints of reservoir development mainly to two factors:First, the complexity of the geological features, Kaiyang-Kaitai fault block reservoir most prominent geological features many faults, and yet a thorough understanding of a number of faults due to the complex fault block oilfield cutting inevitably divided into many fault block, generally complex fault block oilfield have multiple sets of oil-bearing strata, and the reservoir enrichment varied; reservoir thickness, high degree of enrichment of the main oil-bearing strata, and generally has a more sets of oil-water system, and the oil-water relationship is complicate. Most of the complexity of the development characteristics of the fault block oil-bearing area is very small, the complexity of the control the longitudinal position of the same fault block, it is difficult to be combined into a development unit reserves, which led to the fault block oil characteristics of the reservoir development unit small and more rules, it is difficult to form a development well. The same time, the different shape of various development unit, net cloth well to the initial development wells increased very difficult, it is difficult to form a perfect injection patterns. Cloth well in the actual development process, often with experience in reservoir development, the lack of a system theory doing the guidance of well spacing, resulting in well pattern, well away from the complex fault block reservoirs poor adaptability, reservoir development The plane and the degree of vertical imbalance serious monolayer onrush and viscous fingering phenomenon.Kaiyang-Kaitai fault block reservoir geological characteristics and development status, such as complex structural changes, injection and production systems are imperfect, highlight the contradiction between the layers, complex well conditions, expand from five aspects. First, on the basis of existing stratigraphic correlation, the region combined with the layering scheme of the old wells, fine stratigraphic correlation review, find out the region strata in the fault block under the control of the lateral distribution characteristics. Followed by explanations of the use of already established template interpretation interpreting the new drilling wells. Sectional explain the ideas, preferably to establish the area of reservoir interpretation model the the logging curves regionalization corrected on the basis, in accordance with the physical properties of single well, and study39wells in area. Interpretation of the results not only prove a segmented interpretation model in line with the actual study area, and has laid a good foundation for conducting reservoir heterogeneity. Again, the distribution and evolution of the deposition phase study section in further analysis, that the littoral and shallow lake deposition in the study area, the development of the beach, sandbank, shallow lake mud three kinds of sedimentary microfacies. And compilation of various small layer deposition phase plane more systematic, comprehensive exhibit of the work area each period sedimentary facies distribution and evolution. And then on the basis of research and heterogeneity of the reservoir characteristics, reservoir evaluation. Finally, the preparation of a small layer of oil sand body diagram, reserves review and calculation, and oil sand body to conduct a comprehensive evaluation, combined with the oil-water distribution characteristics analysis of reservoir characteristics.Better research methods used for main oil layer of sand body heterogeneity calculation and evaluation of sand body distribution characteristics and the thickness of the sand body is depicted, the final submission of the results, also bettermatch production and test data, to achieve the purpose of this thesis...