南堡凹陷沙一段烃源岩综合识别及分布预测OA北大核心CSTPCD

Objectives Addressing the significant heterogeneity of hydrocarbon source rocks in various sub-depressions in the Nanpu Sag,it carried out an in-depth study to identify and forecast the distribution of these hydrocarbon source rock formations.Methods Select logging curves that are more sensitive to organic matter,establish a quantitative prediction model for hydrocarbon source rock TOC using the Δlg R method and multiple linear regression method for different sedimentary facies zones in the study area,and compare and verify the prediction results to select the optimal prediction model.At the same time,establish the corre-lation between seismic reflection characteristics and geochemical properties of source rocks in the Nanpu Sag,develop a relationship among single-well source rocks,seismic facies,and sedimentary facies,and per-form lateral tracing.Results The results indicate that the multiple linear regression method in the research area has a small prediction error for TOC,which can better meet the precision of TOC prediction.The TOC logging curves of high-quality hydrocarbon source rocks are mainly box shaped,occasionally interbedded with serrated characteristic curves.The seismic reflection characteristics mainly show medium to strong am-plitude,medium to high frequency,high continuity,and have sub parallel-parallel reflection structures.The TOC logging curve of medium hydrocarbon source rocks is mainly characterized by high-value peak saw-tooth shape,with seismic reflection characteristics of medium-weak amplitude,medium-low frequency,continuity-relative continuity,and sub parallel reflection structure.Conclusions The source rocks of the Es1 in the Nanpu Sag are mainly developed in three regions.The largest area is located between the 5th and 1st structural belts of the Linque Sag,followed by the hanging wall at the junction of the Gaoliu Fault and the Xinanzhuang Fault,as well as near the 3rd structural belt.The research results can provide theoretical guid-ance for the subsequent exploration and development of unconventional oil and gas reservoirs in the Nanpu Sag.