Rapid Identification And Evaluation Method Of Low Resistivity Oil And Gas Reservoir In Bo Zhong Area

In Bo Zhong area,the low resistivity oil and gas bearing reservoir is widely distributed,mainly in the upper tertiary middle Ming Hua Zhen formation.It is also widespread in Guan Tao,Dong Ying and Sha He Jie formation.The genesis of low resistivity pay is more complex in Bo Zhong area,and it is related to the reservoir buried depth and sedimentary environment.Among them,in Ming Hua Zhen pay,there is higher clay content and thickness is thin with fine granularity lithology.The main reason for its genesis may be associated with additional conductivity of clay and high bound water content,and longitudinal resolution limit of the logging instrument.In Guan Tao and Dong Ying reservoir,there is lower clay content and thinner thickness with fine granularity lithology.Its genesis of low resistivity may be related to additional conductivity of clay and longitudinal resolution limit of the logging instrument.In Sha He Jie reservoir there is lower clay content and more thickness with fine granularity lithology.The main reason for the low resistivity genesis may be associated with additional conductivity of clay and high bound water content.After summarizing the predecessors’ experience and lessons in mudlogging data application,a new thought of the mudlogging data interpretation of two-step methodology established based on FLAIR data and geochemical data,namely first identify hydrocarbon fluid type in reservoir pore,and then hydrocarbon fluid saturation evaluation in reservoir pore.At the same time,in view of the characteristics of low resistance pay in Bo Zhong area,6 hydrocarbon fluid type identification models were established such as the component relative content trend line model,the fluorescence-gas component model,heavy gas component-methyl cyclohexane model,pixar-tri angle model,Gadkari gas ratio model and geochemical model of identify the property of the crude oil.6 reservoir evaluation models were built up such as component abnormal amplitude parameter model,total hydrocarbon fluid type index model,the combined component ratio model,volume gas in rock model,Characteristics peak shape of gas component model and geochemical model of reservoir evaluation.In addition,implying this application,this paper tested the low resistance oil bearing reservoir quickly identify and evaluate the effectiveness of the method,the reliability and good application effect.