Paleogeomorphology restoration and its significance in controlling reservoirs: a case study of the fourth member of Sinian Dengying formation in the Moxi area, Sichuan Basin, SW China
Carbonates and Evaporites, ISSN: 1878-5212, Vol: 39, Issue: 4
2024
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Article Description
Paleo-karst has important controlling effects on carbonate reservoir development in the fourth member of Sinian Dengying formation (Dengsi) in the Moxi area, Sichuan Basin. In this paper, using core data, thin sections and drilling, logging and seismic data of Moxi area, paleokarst was identified and analyzed. Based on the previous results of paleogeomorphology restoration in the whole basin, the ‘double interface’ method was used to restore the karst paleogeomorphology. A four-level quantitative division standard of paleogeomorphology in Moxi area was established. The quantitative characterization of paleogeomorphology is realized. Finely characterize the distribution characteristics of ancient landforms on the plane. Combined with the combination and configuration relationship of different micro-geomorphic units, the distribution of ancient water system in weathered karst period is described. Based on differences in the characteristics of hydrodynamic system, the karst ‘differential dissolution’ development model of the Dengsi Formation is established. Through the characteristics of stratigraphic evolution, the control effect of ‘differential dissolution’ development model on reservoir development is further elaborated, which leads to the development of karst reservoirs showing the characteristics of zoning. The results show that the paleogeomorphology controls the development period, distribution, thickness and reservoir space of high-quality reservoir. The control effect of paleogeomorphology on high-yield gas wells is clarified. The residual hill and terrace of the lower slope are the most favorable micro-geomorphic units. This study provides guides for the well location deployment and productivity construction of gas reservoir development in the future.
Bibliographic Details
Springer Science and Business Media LLC
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