The Tight Oil Reservoir Mechanism Of Changji Oilfield In Lucaogou Formation

Tight oil refers to adsorption or free state occurs in the source rock, source rocks interbedded with or close to the sandstone, carbonate rocks and other dense reservoir rock, has not been large-scale long-distance migration oil accumulation. Chang ji oilfield exploration and development Permian Lucaogou tight oil began around 2010, Jimsar depression before the main exploration and development layer Permian Wutonggou, Lucaogou only as a second layer exploration. In September 2011 JI 25 wells oil officially opened a prelude to the exploration and development of Lucaogou formation. The study will be in the tight reservoir of Permian Lu Cao Gou upper and lower dessert body as the research object, based on the logging data, logging data, seismic data in the study area, core data, such as analysis of test data in detailed analysis, and Lu Cao Gou group reservoir sedimentary system in terms of macroscopic and microscopic description, identify the relationship between the sedimentary system types and space configuration. Using a large number of thin section microscopic observation and identification information, the Lu Cao Gou group clastic sedimentary reservoir, particle size and sorting, rounded, clastic particles contact relations between sedimentary fabric has carried on the quantitative and semi-quantitative description. Use of the slip layer of montmorillonite crystal layer of the percentage of reservoir diagenetic stage division; Through the casting thin sections and other reservoir property appraisal, find out the characteristics of reservoir property and pore structure types; By scanning electron microscope, fluorescence thin section identification analysis, the reservoir diagenesis types and characteristics are analyzed. On the basis of the above research contents, this paper discusses the research area of dense reservoir diagenetic mechanism, and finally analyzes the restriction factors of dense reservoir, the reservoir is evaluated.