The Research Of Reservoir Characteristics Of Chang10Reservoir In Gao52Area Of Ansai Oilfield

Chang10reservoir in Gao52area of Ansai oilfield is oil-bearing strata, which is newly discovered by Changqing oilfield in recent years. It has good prospects for exploration and development. Therefore, in order to expand the proved resreves scale of Chang10reservoirs, it is essential to study sedimentary facies and reservoir characteristics of ChanglO in Gao52area of Ansai oilfield comprehensive and systematic.This research based on multidisciplinary theory of petroleum geology, reservoir geology, logging geology, the develpoment geology of oil and gas field, by core observation, test and analysis data of various types of reservoir samples, and combined with logging data ect, carried out the research of strata division and correlation and the research of strutural features, the research of sedimentary facies, the relevance of lithological property, physical property,electrical property and hydrocarbon property and rock characteristics,the microscopic structure characteristics of pore,and sensitivity characteristics of Chang10reservoir.The study shows that: the Chang101is divided into three segments:Chang1011, Chang1012, Chang1013in study area, the study area is the delta plain depositional system, the distributary channel deposits of delta plain is most typical.The rock type of Chang10is arkose and lithic arkose, it belongs to super low porosity and ultra-low permeability reservoir, the good or bad of the oil content is controlled by properties and resistivity; the velocity sensitivity of Chang10rservoirs is week velocity sensitivity-strong velocity sensitivity, water sensitivity is week water sensitivity-medium week water sensitivity, salt sensitivity is week salt sensitivity-medium week salt sensitivity, alkali sensitivity is week alkali sensitivity-medium week alkali sensitivity, the part of the study areas is strong alkali sensitivity, there are improving acid sensitivity-strong acid sensitivity.These research results provide significant basis for the development of the next production plan of this area. Besides, the relevant research methods are applicable to the similar geological research.