Research On Reservoir Heterogeneity Of5-7Sand Set Of The Third Member Of Guantao Formation In Dalujia Area

Since1973the DaLuJia reservoir of Linpan oilfield,when it started to be invested indevelopment, has entered the high water cut, high recovery percent and remainingrecoverable reserves of high oil production rate--"three high" stage of development. In orderto further improve the overall recovery of the area and to improve development effectiveness,it is necessary to finely depict reservoir units, in-depth analyze and understand thesedimentary microfacies, reservoir distribution and non-homogeneity of the reservoir in thesingle sand scale. It will provide the geological basis for the numerical reservoir simulation,and reliable geological basis for the geological development program of the study blockadjustment..First, in accordance with the stone core and log data, on the basis of the previous strataand layer division, the Ng37and Ng35of the Guan third segment is subdivided in the singlesand layer with contour correlation, bottom-up divided into73,72,71,55,54,53,52,51,a total ofeight single sand. Then combined with the regional sedimentary background，single wellphase and wells profile phase is analyzed, the sedimentary facies of Ng37and Ng35type isdetermined into braided river deposits of the alluvial fan middle phase and conventionalbraided river deposits. Based on the the drawing of single sand sandstone thickness contourmap, every single-layer type of sedimentary microfacies and distribution model is researched.According to the core, particle size analysis and indoor laboratory data, the reservoir rockcharacteristics, the reservoir space types and the reservoir characteristics and sensitivity areanalyzed and described. Analyzing the every single-plane distribution characteristics of sandand reservoir physical property changes of the Ng37and Ng35, the interbed identificationstandard is established, interbed distribution law, the inter-layer, intra-layer, plane andmicro-heterogeneity are analyzed. Finally, based on a comprehensive analysis of thesedimentary microfacies of reservoir distribution characteristics, physical characteristics andresults of reservoir heterogeneity analysis, the main factors of the impact of reservoirheterogeneity are the depositional environment and diagenesis.