Research On Logging Evaluation Method Of Marine Shale Gas In Jiaoshiba

Shale gas and conventional oil and gas the difference is mainly reflected in three aspects,one is the different storage conditions,shale gas storage in shale(including rock inclusion thin tight sandstone,shale carbonate),which we usually think of source rock,caprock,with self,self storage,low porosity,low permeability reservoir characteristics;the second different is the reservoir in state,the shale gas adsorption and free two states occur in shale;the third is the reservoir division,fluid properties,reservoir parameter calculation is very difficult.Now known to North American commercial exploitation value for siliceous shale gas content is generally greater than 25%,and the shale reservoir fracture,which requires logging evaluation model of shale gas will be completely different from conventional oil and gas reservoirs.The shale gas and conventional oil and gas differences become the core problem,which China shale gas exploration and development to achieve a breakthrough at the same time,should also optimize the geological characteristics of logging series for shale gas,it is urgent to establish a complete set of shale oil and gas evaluation technology.This paper focuses on the research on the logging evaluation technology of Jiaoshiba marine shale gas development in the collection of a large number of basic data,based on the pretreatment and characterization,completed the classification and identification of lithofacies,the correlation of six calculation research,establishment and optimization of the model layer of five kinds of geological parameters of shale gas in some categories of reservoir,shale gas reservoir,and ultimately the formation of logging evaluation technique for marine shale gas in the Jiaoshiba.Analysis of the A1,A2 HF and other key wells Lower Silurian and Upper Ordovician Marine shale in the peak of the five group of petrology,hydrocarbon generating ability,experimental data of gas abundance etc.;Based on the classification and statistical analysis of the intersection graph,the six characteristics of shale gas reservoir and its influencing factors were analyzed and evaluated;Based on the analysis of the experimental data analysis and the six relations of shale in the study area,established mineral marine shale rock,physical property,chemical property,oil and gas logging interpretation model of pressure of the five categories of parameters,determine the assessment method of shale gas reservoir mud logging.The mineral composition,physical parameters,quantitative calculation of various parameters;According to the above mentioned parameters,the classification of shale gas layer is explained,and the reservoir is evaluated,and the system is formed.Application of this technology to complete the digital processing and fine interpretation of 6 wells in Jiaoshiba area,and in Sichuan,Chongqing,Yunnan,Guizhou and other areas of shale gas exploration work carried out to promote the application.