Study On Log Interpretation Method Of Sand-conglomerate Reservoir In Lei64

Sand-conglomerate reservoirs in S3Formation in Lei64have the characteristics ofstrong heterogeneity, complex pore structures, poorly sorting and shaliness, therefore accuratelogging evaluation becomes focus and difficult in exploration and development ofsand-conglomerate reservoirs. Based on coring analysis and petrophysical experiment, thelithology is studied by statistical methods and then divided into sandy fine conglomerate andinequigranular sandstones. Based on the core analysis and test data, the lithology,petrophysical property and mineral composition of these two kinds of reservoirs are studiedby statistical methods. Based on coring and logging data, the sensitive log of lithologyidentification is preferred by histogram, and the models of log cross-plot, decision tree andsystematic clustering are established to identify the two kinds of lithology with the sensitivelogs. Based on the core experiment data and logging data, the parameter interpretation modelof reservoirs is established and is used to calculate shale content, porosity, permeability,irreducible water saturation of two kinds of reservoirs. Based on the core experiment and thecharacteristics of these two kinds of reservoirs, the conductance law of sandy fineconglomerate reservoir is described by pore geometric conduction theory, then the saturationmodel of sandy fine conglomerate reservoir is established, and the conductance law ofinequigranular sandstone reservoir is described by pore geometric conduction theory andeffective medium conduction theory, then the saturation model of inequigranular sandstonesreservoir is established, and water saturation solution method is given in this paper, the effectsof the factors on the proposed models are analyzed, parameters of the models are alsodetermined based on core experiment. Then, the log data of sandy fine conglomerate reservoirand inequigranular sandstones reservoir in Lei64are processed with parameter interpretationmodel and saturation methods, and the processed results are compared with well test results.The results show that the models can be well applied in log interpretation of sandy fineconglomerate reservoirs and inequigranular sandstone reservoirs in Lei64.