A Study On Reservoir Characteristics And Accumulation Of Main Control Factors For Palaeogene Buxin Formation In Sanshui District

Through various types of chip quantitative appraisal, the core nuclear magnetic resonance(NMR) test analysis, conventional mercury injection test and other modern analysis means of laboratory test, using the study of sanshui block logging, analysis, test, coring and well logging data, analysis of the sedimentary characteristics, petrological characteristics, reservoir characteristics, physical characteristics, reservoir macroscopic distribution characteristics,conditions of hydrocarbon source rock, cap rock condition, and combining the structure characteristics of the studied area are further analyzed the heart group period of hydrocarbon accumulation in the study area main control factors, and finally summarizes the oil and gas enrichment regularity. Research shows that: (1) BaoYue area three lithology mainly lithic arkose and feldspathic lithic sandstone and porosity was 2.21 ?16.12%,and 10.66% on average, the body is less than 15%, the permeability of 0.036 ? 595 mD, an average of 74.35,mD, in the main body is less than 50 mD for low - hole, in the low - permeability reservoir,dissolution and cementation and compaction is the main diagenetic types in the study area.Weak compaction, remaining intergranular hole to save more, relatively weak cementation, the clastic particles was secondary, compaction, surface calcite pack is on the impact of diagenesis on reservoir property main factors; (2) the reservoir type is mainly for atmospheric pressure reservoir structure, time for lithologic reservoir and the reservoir rock traps. (3) the organic matter type: the heart group 2 is given priority to with ? type, dark mudstone in the organic carbon content is between 0.7% ? 1.5%. Content of chloroform bitumen "A" minimum 0.011%, as high as 0.228%,the value of 0.103%. Total hydrocarbon content of 17 ?1578 mg/l,the value of 643 mg/1,Ro values between 0.8% ?1.8%, has reached the standard of good source rock, BaoYue structure in the study area is close to the source YanHou BaoYue sag value area,sand dyke head block is located in a small pond area oil YanHou values, is extremely advantageous conditions of hydrocarbon source rock. (4) for oil source sag BaoYue sag, small pond sag, the corresponding structural belt in developing a better trap, hydrocarbon source rock in the heart group 2 in HuaChong formation sedimentary period has into the oil window,life and overlying the heart group three structural trap, had formed in the period before or during the same period to capture the oil accumulation. (5) (1) "lung" in the concave structure provides a favorable will move, aggregation accumulation point; (2) the good matching relations between the structure and the reservoir provides favorable conditions for the reservoir formation; (3) lateral sealing of faults control plays an important role in the formation of reservoir...