Reservoir Characteristics And Geologieal Modeling Of The Yan-9Reservoir Of Jurassic In ZJ2Area

The Yan9reservoir of the study area ZJ2is in the high water stage of development, but the reservoir is in the low level of recovery degree, surplus oil excavate potential is higher. With Sedimentology,reservoir geology as theoretical guidance and the core, logging interpretation and oil field production performance data as the basis, based on stratigraphic division and correlation, sedimentary microfacies, reservoir characteristics and reservoir heterogeneity of the Jurassic Yan9of the study area ZJ2, this paper used Petrel software to complete reservoir geological modeling of the study area. Through the structure of the reservoir space, property characteristics to show three-dimensional space characteristics, lay the foundation for the remaining oil prediction and digital simulation of the late.The main results and innovation achieved of this paper are as follows:1、According to the logging flag, the principle of sedimentary cycles, the principle of thickness to divide the Yan9into three small Yan91Yan92and Yan93.2、According to the indicators of sedimentary facies in the core and logging data, divide sedimentary facies to Anastomosing river facies,the reservoir is mainly distributed in river microfacies, point dam microfacies and the river edge microfacies deposition.3、According to the the microfacies lithology, porosity, permeability, pore throat sorting coefficient and skewness established four categories of reservoir evaluation criteria, according to evaluation criteria, the Yan91and Yan93reservoirs is class II reservoir, is relatively good reservoir, Yan92reservoirs is class I reservoirs, is a good reservoir, and most of the reservoir of the study area is low permeability reservoirs.4、Mainly from non-homogeneity of layer, plane heterogeneity and heterogeneity between layers,this paper study the heterogeneity of the reservoir.The study of non-homogeneity of layer integrate the rhythm of rock particle size distribution in the vertical direction of the sand body within the layer, the bedding structure of layer, muddy intercalation of layer and characteristic parameters of permeability heterogeneity of layer, we can see the heterogeneity of Yan9in the study is very strong.The study of plane heterogeneity integrate plane geometry of the plant sand body, continuity and connectivity of the sand body, as well as the directional distribution of porosity and permeability characteristics, the deposition of Yan9is stable and continuous, so the continuity and connectivity of sand bodies is better, sand bodies is zonal distribution along the river channel, the plane heterogeneity of reservoir is largely controlled by sedimentary microfacies. the well area that has weak plane heterogeneity is generally located the middle part of the river microfacies,point sand bar and the flood plain, and the over areas or the dividing line of between where is Mutation, the plane heterogeneity of reservoir is large.Between the lower part of Yan9and the upper of Yan10, the upper of Yan9and Yan8of the study area, there is a thin muddy compartment, the meandering river deposits of Yan9and braided river deposits of Yan10are Inheritance, so overall the heterogeneity of reservoir Yan9is weak in the reservoir layer.5、According to divide fine stratigraphic and study microfacies of the study area, used Petrel modeling software, use the stochastic modeling methods to establish the structural model, strata formation model, facies model and attribute parameter model of Yan9.