Analysis Of Characteristics Of Lacustrine Carbonate Reservoirs In The Lower Part Of The Sha 1 Formation In Qikou Depression

Exploration of the past proved lacustrine carbonate rocks can be regarded as an important reservoir. Integrated use of geological data of this thesis, core, well logging analysis, analysis of laboratory data, etc.to figure on Qikou depression sub-lacustrine sediment carbonate rock types, sedimentary characteristics, sedimentary patterns and comprehensive study of reservoir characteristics.First to describ the Core, based on the study area by microscopic identification of carbonate rock samples, with X diffraction, scanning electron microscopy analysis.All the study area shows the types of carbonate rocks limestone tablets, microcrystalline cloud Rock, micritic dolomite, shale dolomite, sandy dolomite, Dolomitic limestone or limy dolomite .By analyzing the different carbonate corresponding to the measured curves, the di-fferent rock types in the study area of the intersection curve of GR and AC chart isestablishmented.This chart proved to be effective lithology identification.This recognitio-n means provides a foundation for the drawing thickness contour map which abourt v-arious types of carbonate rocks.We learn from a variety of sedimentary facies marks with the electrical characteristics of carbonate sedimentary facies analysis of single well to study area to analyze various types of carbonate rocks.This study determine the sedimentary facies, and developing grain banks, depressions, bay, lake floor, lake, etc. subfacies, and drawn the lithofacies paleogeography map. Based on all the works obove, the study build the suitable depositional model for researched area carbonate rocks.Through the core described, rocks slice observation of the microscope, with a nu-mber of geochemical data obtained from the experiment, found that in the researchedarea carbonate reservoir experienced compaction, pressure solution, cementation, dolomi-tization, dissolution recrystallization.All of these diagenesis Deeply affect the carbon-atereservoir. Carbonate in Sha 1 lower sub-interval mainly developed the sub-section ofholes, sew two types of storage space, Secondary dissolution porosity played a leadingrole.Through the research of the carbonate reservoir porosity, and draw the relevant ro -ck porosity contour maps. Integrated favorable reservoir rock type distribution, storagespace type, pore structure and reservoir characteristics and other aspects, the carbonate-reservoir in Sha 1 lower sub-interval is divided into four categories, and summarized t-he favorable reservoir distribution characteristics. Finally, predicted the favorable zonesin tne research area, obtained favorable zone distribution prediction map.