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| Citation: |
LIU Z R，CHEN K Q，FAN Z W，et al.，2025. Lithofacies paleogeographic characteristics of the Middle Jurassic Buqu Formation in the northwest Qiangtang Basin[J]. Sedimentary Geology and Tethyan Geology，45(1)：1−13. DOI: 10.19826/j.cnki.1009-3850.2024.04003
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The Buqu Formation of the Middle Jurassic is an important horizon for oil and gas exploration in the Qiangtang Basin. During the field geological survey, a set of high-quality dolomite reservoirs was discovered in the northwest Qiangtang Basin. Due to the lack of exploration work in the early stages, the analysis of sedimentary facies characteristics remains an important factor for achieving breakthroughs in oil and gas exploration in the Middle Jurassic Buqu Formation of the northwest Qiangtang Basin. Based on field section lithology observations and rock thin section identification, seven typical types of lithofacies assemblage developed in the area are summarized, and the sedimentary facies types and distribution characteristics in the Buqu Formation are analyzed. The results show that: (1) From south to north, the Middle Jurassic Buqu Formation develops four types of sedimentary subfacies, namely the open platform subfacies, the platform margin subfacies, the slope subfacies, and the shallow water shelf subfacies, which can be further subdivided into seven types of suborder facies. (2) Based on the planar distribution of sedimentary facies of the Buqu Formation in the Middle Jurassic, the sedimentary model is defined as a typical rimmed carbonate platform with a sedimentary model from "open platform" to "platform margin", "slope", and "shelf". (3) Combined with the vertical superposition relationship between the Triassic and Jurassic strata in the area, it can be further determined that the combination of source-reservoir-seal form with the dark mudstone of the Adula Formation (T3a), the Buqu Formation (J2b), and the Suowa Formation (J3s) as source rocks, the dolomite and bioreef limestone of the Buqu Formation as reservoirs, along with the micritic limestone of the upper Buqu Formation and the mudstone and gypsum of the Xiali Formation as seals. It provides theoretical support for breakthroughs in oil and gas exploration in the Middle Jurassic Buqu Formation of the northwest Qiangtang Basin.
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