Application of rock structure component identification technology by well logging in dolomite seismic lithofacies identification

Abstract

Abstract: The Cambrian Longwangmiao Formation in central Sichuan Basin contains dolomite reservoirs of grain shoal facies. Such reservoirs are characterized by large burial depth, thin formations, difficult classification of dolomite microfacies in single well, and variable lithofacies in lateral direction. On the basis of the improved Lucia rock structure component identification technology by well logging, this article discussed the lithofacies of dolomite in the Cambrian Longwangmiao Formation in the Moxi-Gaoshiti region in central Sichuan Basin by using the “sedimentary multi-parameter” seismic lithofacies identification technology. Three types of lithofacies were identified, i.e., medium-fine crystalline dolomite lithofacies in grain shoal, crystal powder dolomite lithofacies in lagoon behind the shoal, and micrite dolomite lithofacies in inter-shoal sea. Moreover, it was predicted that the predominant lithofacies (medium-fine crystalline dolomite lithofacies in grain shoal) is distributed in the south and middle parts of the study area.

Key words: rock structure, grain content, sedimentary multi-parameter, seismic lithofacies

Chang Shaoying, Shen Anjiang, Li Chang, Zhou Jingao, Yu Yizhi. Application of rock structure component identification technology by well logging in dolomite seismic lithofacies identification[J]. China Petroleum Exploration, 2016, 21(5): 90-95.

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