High-quality hydrocarbon source rock identification and quantitative evaluation with multi-attribute inversion: A case study of Liaodong south sub-sag,Bohai Bay Basin
Cai Dongmei1, Zhao Dijiang2, Peng Jingsong2, Fu Li2, Zeng Jinchang2, Cheng Yaoqing2
1. Tech-Drilling & Production, CNOOC Energy Co., Tianjin 300452, China; 2. Tianjin Branch, CNOOC, Tianjin 300452, China
Abstract：A high-quality hydrocarbon source rock identification scheme is established based on geochemistry, logging and seismic data in the Liaodong south sub-sag, Bohai Bay Basin.For this three-grade scheme, geochemical characteristics include TOC>2%, hydrocarbon generation potential >10mg/g, and vitrinite reflectance (R0)>0.5%.Logging curves are characterized by high gamma, high resistivity, high moveout, high neutron porosity, and low density.Seismic reflection is characterized by low frequency, strong amplitude, continuous and parallel reflection.TOC curves of single well is created with logging data, cross-plot analysis, multiple regression, and the ΔlgR method, which provides independent variables for seismic multi-attribute inversion.Multi-attributes relative to TOC are optimized with multiple regression and neural network, and are inverted into TOC volume.So quantitative TOC evaluation is realized.According to our results, high-quality source rocks are widely distributed in the south sub-sag.The north part is the hydrocarbon-generation center, in which source rocks are thicker than that the south part.Source rocks in the south part are bead-distributed along a strike-slip fault.Several-series source rocks existed in the south sub-sag are widely distributed and will be a bright prospect for the future petroleum exploration.
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