Reservoir Geological Modeling Of Chang-8₁ Member Of The Yanchang Formation In Honghe105 Area In Zhenjing Oilfield, Ordos Basin

Since honghe 105 area in the southern part of zhenjing oilfield got a high-yield industrial oil flow in 2008 , assessment of resource around this region has been made three times, which suggested the region has good exploration and developmental prospects.The major reservoir of this block are characterized by low porosity and permeability, and weak natural energy, in order to improve further exploration and development results, this paper establish honghe 105 area chang 811 reservoir geologic model on the basis of the data of existing drilling, the analysis test and oil testing and production test, to provides technical support for scale development of the zhenjing oilfield 811 reservoirs.The stratum was careful partitioned and contrasted on the basis of the sedimentary sequence, lithologic combination relations and data of logging well in this paper; we made comprehensive research and analyze the division and distributing of sedimentary microfacies; Then we analyzed the relevance of 4 attribute by using secondary interpretation of log information; Finally, using reservoir properties as key proxy, the 3d geological model of the study area was established with multiple factors under control ,such as sedimentary microfacies ,sand body thickness and fissure density, achievements and understanding as follows:1,Chang 81 reservoir can be devided into four layers in descending order, chang 811,chang 812-1,chang 812-2,chang 812-3.2,Chang 81 reservoir belongs to delta front deposition, chang 81 small layer on the top of it belongs to shallow lake facies deposition; which can be divided into subaqueous distributary channel, subaqueous interdistributary bay, mouth bar, crevasse-splay, subaqueous natural barrier, shallow lake sand and shallow lake mud. 3,Logging interpretation templates was established, and we got the information of porosity , permeability and water saturation for building property model. Average porosity is 5.4%; Average permeability is 0.1 md; Average oil saturation is 20.2%.4,With the software of Petrel, using the stochastic methods of Sequence Indicator Simulation and Sequence Guass Simulation, we established the geological models of chang 81 reservoir structure model, which include sedimentary microfacies model, porosity model, permeability model and oil saturation model. We also established reservoir evaluation model on the basis of standard of reservoir classified evaluation;The reasonable prediction results are consistent to geological knowledge, which realize the lateral prediction of reservoir.