Prediction of TOC content in source rocks in southwestern Bozhong Sag
WANG Xiang1,2,3, MA Jinfeng1,2,3, WANG Deying4, WANG Zhenliang1,2,3, ZHANG Xintao4, WANG Feilong4
1. Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China; 2. National & Local Joint Engineering Research Center of Carbon Capture and Storage Technology, Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China; 3. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, Shaanxi 710069, China; 4. Exploration and Development Research Institute, Tianjin Branch of CNOOC, Tianjin 300452, China
Abstract:The total organic carbon (TOC) content in source rocks is the primary parameter for evaluating the abundance of organic matter.Core measurement by geochemical methods can only obtain discrete TOC,and it is difficult to achieve three-dimensional quantitative evaluation on source rocks.In this study,combining geophysical logging data with seismic pre-stack inversion,and aiming at the deep continental source rocks in the southwestern Bozhong Sag,we analyzed and optimized the elastic parameters sensitive to TOC through petrophysical intersection diagrams and established a seismic inversion model of TOC and P wave velocity and density.Using the optimized extended ΔlogR method and seismic pre-stack inversion method,we calculated the TOC of the Dongying and Shahejie formations in the southwestern part of the Bozhong Sag.Finally,we obtained a TOC curve and a 3D TOC inversion body,and calculated the TOC seismic prediction plans of the E3d2[KG-*4]L,E3d3,E2s1+2 and E2s3 members.The results show that the well-seismic prediction error is small,proving the reliability of the prediction me-thod.The source rock in the study area is highly hetero-geneous,and characterized by "multiple layers and wide distribution".The source rocks in the northern Dongying formation are better than those in the southern,and the TOC of the E3d3 is generally higher than the E3d2[KG-*4]L.The Shahejie formation has higher TOC,and it is the primary source rock interval in the study area,showing gradually decreasing TOC outward from the depositional centers,especially in Wells A,B,C and E drilled into the E2s1+2 and their nearby areas.In Wells A and C drilled into the E2s3,and their west and south,the TOC is the highest,showing a good hydrocarbon generating potential.
王祥, 马劲风, 王德英, 王震亮, 张新涛, 王飞龙. 渤中凹陷西南部烃源岩TOC含量预测[J]. 石油地球物理勘探, 2020, 55(6): 1330-1342.
WANG Xiang, MA Jinfeng, WANG Deying, WANG Zhenliang, ZHANG Xintao, WANG Feilong. Prediction of TOC content in source rocks in southwestern Bozhong Sag. Oil Geophysical Prospecting, 2020, 55(6): 1330-1342.
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