QFA Application Research The Reservoir Identification In Bozhong Depression

This research project is mainly to solve the wellsite quickly identify oil and gas,according to further implement the fluid properties and types of oil identification in reservoir,and eliminate drilling fluid additives,the influence of factors on the real formation oil and gas shows.This project by QFA in bohai depression in 56 well 77 standard crude oil sample,292 sidecore samples and 41 kinds of drilling fluid additives organic samples for analysis object and comprehensive research.Established the different properties of crude oil,drilling fluid system in high fluorescent organic additives of the QFA pattern library,provide a basis for judgment in judge true and false shows of oil and gas.According to the characters of mapping characteristics of crude oil and additive map according to the number of main peak,the peak position judge true and false shows of oil and gas.Set up two discriminant method of crude oil properties: Ex with Em point method and the best wavelength ratio with the density of crude oil point method.Ex with Em pitch point method,mainly by Em emission wavelength values as the standard,when Em is less than 340 nm and best wavelength ratio between 1.127 ~ 1.140 for condensate oil,when Em is 340-385 nm and best wavelength ratio between 1.155 ~ 1.191 for light oil,when the Em is 385 ~ 405 nm and best wavelength ratio between 1.120 ~ 1.153 for intermediate,when the Em is more than 405 nm and best wavelength ratio between 1.088 ~ 1.123 heavy oil.Established two explanations evaluation method for fluid properties in reservoir: chart method and longitudinal parameter change trend.Chart method to use oily index and contrast,when oily index more than 1 and contrast level is greater than 6 for oil zone reservoir,when oily index less than 1 and contrast level is greater than 6 for the gas zone,when the oily index less than and contrast level is less than 6 for dry layer or water layer.Longitudinal parameters change trend method use oily index,the contrast level and total gas,when the contrast level is more than 6,oily index greater than 1,total gas more than five times as much as a background value for oil zone reservoir,when the contrast level is more than 6,oily index less than 1,total gas more than five times as much as a background value for gas zone,when the contrast level compared to the top of the tree is higher than the bottom,and top is greater than 6,oily index greater than 1,at the bottom of the gas logging value reduced to oil-water namely longitudinal suddenly,when the contrast level is less than 6,oily index stability,gas logging value is less than 5 times of background for water zone.The method in Bohai depression in the past two years achieved good application effect in the wellsite,to distinguish true and false shows of oil and gas,light oil reservoir discovery,weak fluorescent display,fluid properties and types of oil identification with strong technological advantage.Using the method of 6 well crude oil property judge coincidence rate reaches 100%,test of 9 Wells fluid properties judge coincidence rate reached more than 89%,far higher than that of conventional logging judgment of the reservoir,further illustrate the QFA in the field of oil and gas shows interpretation evaluation has very good effect,gradually to the whole Bohai sea application promotion.