Study On Reservoir Architecture Of Neogene ?-? Oil Group In Hanging Wall Of No. 2 Fault In Gaskule Oilfield

This thesis which is based on the theory of sequence stratigraphy,sedimentary petrology,tectonic geology,reservoir geology,petroleum geology,industrial geology of petroleum,and mathematical geology of oil,adopts synthetically the information of geology,logging,and other data for the stratigraphic division and correlation of small layer according to sedimentary cycles and curves.Based on the stratigraphic correlation principle of "half amplitude point",this thesis has also finished the classification and comparison of reservoir,barrier and interlayer.Sand bodies have been identified by genetic analysis and sedimentary microfacies have been analyzed synthetically with geological facies and well logging facies.Reservoir architecture on research area is studied refer to Miall's reservoir architecture theory of fluvial facies,and a refined three-dimensional reservoir architecture model is established by reservoir sedimentology and geostatistical methods.The following results have been achieved:The Neogene strata of the upper plate of gasikul oilfield has been contrasted and divided by the method of sedimentary cycles and curves pattern.As a result,the V and VI reservoir group of low-Youshashan formation(N21)are divided into 30 and 16 small layers respectively.Then,several interlayer,51 pairs of reservoir and barrier are classificated with sedimentary time unit by the stratigraphic correlation principle of "half amplitude point"According to provenance characteristics and sedimentary background of study area,the source direction is NW-SE and the interval of interest developed a braided river delta and lake depositional system.In line with sedimentary facies,braided river delta front,shallow lake subfacies and numerous sedimentary microfacies included subaqueous distributary channel,subaqueous interdistributary area,mouth bar,distal bar,sheet sand,beach bar and shallow lake mud believed to exist through the comprehensive analysis.V and VI sands group are gradually transited from the braided river delta front to the shallow lake subfacies following the source on a flat surface.Meanswhile,the lake facies evolved into the braided river delta front subfacies from the bottom up,which shows the phase sequence characteristics of the progradational reverse cycle as a whole.The concept of single sand body has been modified and defined as an independent sand body which is formed in the same sedimentary time unit and is not separated by the occlusion layer.Based on the definition,the single sand bodies have been identified and mapped.On the basis of the lithology characteristic,the log curve characteristic and the coring data,the partition scheme of internal configuration interface,architecture unit and rock facies type of the reservoir are studied.The identification characteristics of each configuration interface and rock facies types of 5 types of architecture units are exposited,even 10 kinds of contacting relationship of architecture units and 6 types of reservoir architecture pattern are summarized.In accordance with comprehensive interpretation results of geologic,and logging,configuration interface model of the research area is established by the restriction of standard layers and inverse distance weighted average interpolation.After that,the deterministic modeling method is adopted to establish the sedimentariy micro facies model and barrier model by analyzing the geological logging facies compositively.The interlayer model is built by the variogram and random modeling method of sequential gaussian simulation.Finally,random modeling method of sequential gaussian simulation is also used to establish the reservoir parameter(porosity,permeability,oil saturation)model under the restriction of sedimentary facies model.After the model has been coarsened,it provides a fine and reliable geological data for the numerical simulation of the reservoir.