Depositional combination of carbonate grain banks of the Lower Cambrian Longwangmiao Formation in Sichuan Basin and its control on reservoirs |
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| Authors: | Yang Wei-Qiang Liu Zheng Chen Hao-Ru Lan Cai-Jun Xu Zhe-Hang Lu Chao-Jin Zou Hua-Yao |
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| Institution: | 1.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing）, Beijing 102249, China;2.College of Geosciences, China University of Petroleum（Beijing）, Beijing 102249, China;3.Faculty of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China |
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| Abstract: | Rock types, sedimentary subfacies and grain bank properties of the Longwangmiao Formation are studied in detail by outcrop, drilling and logging data, core, thin section and physical property of the Longwangmiao Formation in the Sichuan Basin. The characteristics, development and distribution of grain bank depositional combinations of the Longwangmiao Formation in Sichuan Basin and their control on reservoir development are discussed. The results show that: （1）four main rock types can be identified in the Longwangmiao Formation in Sichuan Basin. Vertically, three upward shallowing depositional combinations associated with carbonate grain bank can be identified: multi-stage vertical overlapping of grain banks, grain bank-tidal flat（mixed tidal flat）, interbank-grain bank（-tidal flat）; (2）the distribution of depositional combinations of grain banks is controlled by paleogeomorphy and sea level fluctuation;and the horizontal distribution is mainly controlled by paleogeomorphy, the vertical overlapping of multi-stage grain banks is mainly developed in the central Sichuan Basin, grain bank-tidal flat（mixed tidal flat）mainly develop in northern and southwestern Sichuan Basin, and interbank-grain bank（-tidal flat）mainly develop in the eastern and southeastern Sichuan Basin;vertically, they are mainly controlled by sea level changes, and have close relationship with their locations in the sequence stratigraphy, and interbank-grain bank（-tidal flat）mostly develop in the middle and lower parts of the sequence, multi-stage vertical overlapping of grain banks and grain bank-tidal flat（mixed tidal flat）develop in the upper part of the sequence; (3）multi-stage vertical overlapping of grain banks is the most favorable for reservoir development, followed by grain bank-tidal flat（mixed tidal flat）combination, and interbank-grain bank（-tidal flat）combination has the poor reservoir physical properties. |
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| Keywords: | Sichuan Basin Cambrian Longwangmiao Formation grain bank depositional combination |
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