| Citation: | LIU Zhen，LIU Peng，WANG Peng，et al. Identification of karst micropaleogeomorphology and reservoir characteristics of Maokou Formation in Yunjin area, South Sichuan[J]. Bulletin of Geological Science and Technology，2025，44（0）：1-9 doi: 10.19509/j.cnki.dzkq.tb20230576
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The development of karst reservoirs in the Maokou Formation of the Lower Permian in southern Sichuan is a key formation for conventional oil and gas exploration in southern Sichuan. The development level of supergene karst reservoirs is directly controlled by the rich and varied karst microgeomorphology, resulting in strong lateral heterogeneity of karst reservoirs.
This paper uses 3-D seismic data, combined with strata thickness, gradient structure tensor attributes, and geological body carving techniques, to characterize the microgeomorphic characteristics of Dongwu karst in the Yunjin area. Predicting favorable zones for surface karst reservoirs through model forward modeling and amplitude attributes.
Research suggests that:①The Yunjin area had significant differences in karst micro- geomorphology during the Dongwu period, with a series of karst caves developed, which exhibited a seismic feature of "pull-down" of the seismic event event axis at the top boundary of the Maokou Formation;②Effectively characterizing the distribution pattern of karst collapse bodies in Yunjin syncline area using gradient structure tensor attributes combined with geological body carving technology. There are three distribution patterns of karst collapse bodies on the plane: isolated, linear, or contiguous;③The seismic amplitude on both sides of the edge of the karst collapse body is weakened, and the karst process is strong, with the development of karst caves, which is a favorable zone for reservoir development.
This research result has guiding significance for the subsequent prediction of Maokou Formation reservoirs.
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