Quantitative evaluation method of mineral composition of complex sandstone:a case study of the upper Paleozoic reservoir in Longdong area
The composition of the upper Paleozoic reservoir cuttings in the Longdong area of Ordos Basin is complex and variable,with poor sorting and big differences in composition and structure.The pore structure of reservoirs varies greatly,and the relationship between porosity and permeability is complex,making it dif-ficult to identify effective reservoirs.Due to the complex pore structure,the electrical properties are greatly affected,the response to the fluid properties is weak,and the fluid properties are difficult to identify.Cur-rently,the logging method with the highest accuracy for quantitative evaluation of rock components is forma-tion element logging.Electrical imaging logging can evaluate formation lithology,but there is a lack of quantitative evaluation methods for rock components.Quantitative evaluation of complex sandstone compo-nents using conventional logging curves is a good attempt.Practice has proven that the application of quanti-tative evaluation technology of energy spectrum rock composition,fine lithological evaluation,and identifica-tion of low resistivity gas reservoirs has achieved good results.The interpretation coincidence rate of the up-per Paleozoic in Longdong has increased to 80％,and multiple favorable gas bearing sand belts have been discovered in the He8 and Shan1 sections.The newly increased gas bearing area is 4 444.1 m2,and the predicted geological reserves are 2 524 × 108 m3.
Ordos Basinsortabilitypore structurestratigraphic elementsmineral composition of com-plex sandstoneconventional logging
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