A Research On Reservoir Heterogeneity Of N21 Reservoir Gasikule Oilfield Of Qinghai Provence
|School||Chengdu University of Technology|
|Course||Mineral prospecting and exploration|
|Keywords||Gasikule oil field N21 reservoir Reservoir heterogeneity Variation function Sphericity model Flowing cell|
By using of the data of sedimentous microfacies, logging and cores, the text studies in-layer heterogeneity, between-layer heterogeneity and plane heterogeneity of the sand layers in the south part of N2’ reservoir in Gasikule oil field of Qinghai province.The studies of in-layer heterogeneity are as follows:The text depicts the characteristics of heterogeneity by calculating the coefficient ofvariability, Kmax/K and K.max/K.min of sand layers of different sedimentous microfacies; divides interlayer into two types, and counts their numbers, thickness, frequency and density of a single sand layer according to the characteristics of lithology and logging, finally summarizes the characteristics of interlayer distributing; sets up five in-layer heterogeneity models and points out that the primary models are model A and C.The studies of between-layer heterogeneity are as follows:The text depicts sand layers’ growth and distributing conditions by calculating the lamination factor, sandstone density and overlap coefficient; makes certain the lithology and thickness of interlayer by the method of contrasting the typical curves.The studies of plane heterogeneity are as follows:The text counts the parameters of the sandlayers’ geometric shape of different sedimentous microfacies; speculates the conditions of lateral communication by sandstone density according to the method brought forward by J. R. L.Allen; gets a group of parameters including the reservoir thickness, porosity and coefficient of permeability by using Kriging method according to the data of logging results; makes certain the direction of coefficient of permeability with variation function by modeling globosity function; divides the sandlayers into five types by using the method of flowing cell based on three parameters, that is X h, KXh and h/H, and accounts the favorable region.On the base of above-mentioned studies, the text evaluates the heterogeneity of sandlayers and gives the resolutions to these problems to serve the development of the field.