Sedimentary Facies Analysis And Reservoir Geological Modeling Of The Second Member Of The Shahejie Formation In Li32Area,Lijin Oilfield

Li32area located in the north of the Lijin oilfiled has went on stream in August1980.Up to now, the second member of Shahejie Formation (Es2) in Li32area is facing suchproblems as unknown sedimentary facies and geological modeling research, low oil recoverypercent, low oil recovery rate, and water content development. It needs to carry out detailedreservoir geological research so as to make for further petroleum exploration in Li32area.This thesis is on the instruction of sequence statigraphy, petroleum geology and reservoirsedimentology. Using geology, analyzed assay data and so on, the thesis carries outsedimentary facies, spatial distribution of sedimentary microfacies as well simulation ofsedimentary microfaceis.In this thesis, the stratigraphical correlation method of Facies Controlled Cycle ofgeneticchronostratigraphy has been utilized to construct high resolution chronostratigraphyframework. Based on the theory of sequence stratigraphic, and combined with tectonic setting,maker zone and spatial evolution characteristics of sedimentary facies, this method can beapplied to correlation chronostratigraphy. The second member of Shahejie formation in Li32area is divided into two long-term based-level cycles, six medium-term based-level cycles,and several short-term based-level cycles. And the high-resolution sequence statigraphicframeworks are established.With the core observation, logging, analyzed assay data and logging data, combined withregional geological background, this thesis researches the sedimentary structures, sedimentarysequences and sand body geometry to determine the distribution of the depositional systemsin the Li32area. And meanwhile, the beach bar and delta sedimentary types are indentified.In the fifth sand group of Es2, with the climate relatively humid, the water body relatively deep, and inadequate supply of supply of sediment, beach bar mainly develops and displaysaggradational deposition. From the fourth of the Shahejie Formation, in the northeast of studyarea the provenance begins to inject, which is mainly from the north Chenjiazhuang uplift. Inthe context of the water receding, the delta deposition develops in the research area, and thesubfacies is the delta front.Based on the facies controlled the modeling thinking, this thesis, which takes fulladvantage of the geological research, uses the truncated Gaussian simulation to build thereservoir three-dimensional phase model, Optimal sequential Gauss simulation and phasedsimulation technology to establish3D property model. In the final, this thesis establishes thethree-dimensional geological model of the Es2in the Li32area, and provides a reliablegeological foundation for the oilfield development program and the adjustment programs.