Reservoir Geological Modeling Of Chang-6 Oil-bearing In Jingbian R Oilfield,Ordos Basin

Jingbian R oilfield is located in the middle of North Shaanxi Slope of Ordos Basin, with small dip, stable internal structure, and no large-scale fracture structure. R oilfield is the important oil producing areas of Jingbian oilfield, which Chang-6 reservoir with lower Chang-7 and upper Chang-4+5 reservior of Yanchang Formation formed the "Down generated Up stored" accumulation model, becomes the main oil producing reservoir. In recent years, with the development of exploration of the Chang-6 reservoir in Jingbian R oilfield, there are vast studies on Sedimentary microfacies and its evolution regularity, the thickness of sand bodies and its distribution characteristics, and the macro distribution characteristics of reservoir physical properties, etc. But understanding in three-dimensional space is not deep enough. Due to increased production and development efforts, the contradictions of reservoir exploitation increasingly deepen, a large amount of recoverable remaining reserves are difficult to exploit. In order to continue to increase and keep peoduction, We need to research on Chang-6 reservoir for further understanding in the aspect of 3D analysis. In this paper, we choose Petrel software to establish fine 3D geological model of Chang-6 reservoir of Jingbian R oilfield, for further exploration and development providing the basis support, and providing accurate and quantitative models that meet the subsurface geological conditions for the comprehensive geological study and numerical simulation of the study area. Also having great significance to grasp and improve the rules of reservoir development and development efficiency.Through establishing fine 3D geological model of Jingbian R oilfield, the main cognition of this thesis are as follows:(1) Chang-6 reservoir in Jingbian R oilfield has simple structure. Chang-61, Chang-62 and Chang-63 present the east-high and west-low feature. It has tectonic relief and Each small layer has better inheritance characteristics. (2) Chang-62 is mainly sedimentary period, developing 3 main rivers and distributary channels cover the entire study area. The sand thickness, scale and connectivity is good. Compared with Chang-62, Chang-61 has shrink apparently, only develop two slightly narrow small distributary channels, and has small sand thicknes, poor connectivity and contiguous. (3) Core analysis data of study area shows, the porosity range interval is 7-13% and average value is 9.51%, Permeability range interval is 0.1-0.9×10-3?m2 and average value is 0.75×10-3?m2, and chang-6 reservoir belongs to low porosity and extra low porosity and ultra low permeability reservoir. (4) The porosity value of Chang-62 is higher than Chang-61 in R oilfield, Its high value area is basically covered in the whole region and has a better continuity in the three-dimensional space; The porosity high value area of Chang-61 is only distributed in the northeast and southwest of the study area, and the continuity is poor in the three-dimensional space. The permeability distribution of Chang-6 reservoir is similar to that of porosity distribution, Chang-62 permeability value is relatively high, and the spatial continuity is significantly better than Chang-61. Chang-62 oil saturation is slightly larger than that of Chang-61, and Chang-61 oil saturation is poor in three dimensional space.