The Reservoir Geological Characteristics And 3D Geological Model About Yan 9?Yan 10 Of Hu307-Xin46 Area In Hu Jianshan Oilfield

In recent years, exploration and development of Yan 9, Yan 10 layers in Hu307-Xin46 blocks of Hu Jianshan oilfield has revealed favorable prospect. However, there also are a variety of problems encountered during the exploration and development, such as the pressure of oil wells on the edge of the oil reservoirs maintaining low; the yield of oil wells declines quickly due to the development generated by natural energy in the east of the reservoirs, etc. Pointing at the currently-existing problems and contradictions in the development, it is an urgent need to develop research work of the reservoir description and reasonable technology policy in the blocks of Hu307-Xin46, whereas new areas of and, and elaborate geological research and high-precision geological model is the necessary premise of the exploration of technical policy for rational development.In this study, taking the results of previous studies on the local and surrounding areas as the guideline, we conduct fine reservoir description in Yan9, Yan10 horizons in Hu3O7-Xin46 block, with well logging data, log data, core observation and various test methods organically combined, cross-disciplinary theories and methods comprehensively used. Subsequently, we choose Petrel modeling software which is appropriate to the area to establish 3D visualized geological modeling.The results of the research show that:1)The top surface structure of each Yan 9, Yan 10 reservoirs'subzone in Hu307-Xin46 blocks is generally in the shape of westward monocline, forming a less fluctuating nose-shaped uplift(uplift 10-30m),which is nearly NE-SW; 2)Deposits of braided river subfacies developed during Yan10 stage in the study area, with 3 kinds of microfacies mainly developed:channel sand bar, the bottom retention, floodplain etc; While sedimentation of braided-river delta plain subfacies formed during the period of Yan9, with distributary channels and back swamp as dominance, natural barriers, crevasse-splay, distributary inter-depression developed locally; 3)Delay 9 in the study area, y10 reservoir lithology is mainly in gray, beige-coarse, coarse-grain feldspar lithic quartz sandstone, a small amount of lithic quartz sandstone, the main size is 0.25-1.1 mm; 4) Sandstone reservoir in the study area, feldspar dissolved pore types mainly include intergranular hole hole, lithic dissolved pore, intercrystalline pore, etc. The intergranular pore is the main reservoir space in this area, feldspar solution pores, lithic dissolved pore and pore contribution to reservoir storage capacity is not big; 5) Overall reservoir physical properties in the study area is relatively good, for in-low porosity, low-low permeability reservoir, lithologic reservoir is a typical;6) macroscopic heterogeneity of Yan9, YanlO reservoirs in Hu307-Xin46 blocks generally belongs to medium inclined to homogenizing.According to the results of the above geological research, we build the 3D geological model of Yan 9, Yan 10 reservoirs in the blocks of Hu307-Xin46, Hu Jianshan oilfield with the application of Petrel software, which accurately and intuitively displays, the geological characteristics of Yan 10, Yan 9 reservoirs in the study area, providing accurately three-dimensional visualized geological model for the later development of numerical simulation, also offering reliable geological basis data to formulate reasonable policy of technology development in the study area.