Characteristics and distribution of grain bank of the Lower Cambrian Longwangmiao Formation in Moxi-Gaoshiti area, Sichuan Basin
Jin Mindong1,2, Tan Xiucheng1,2, Li Ling1,2, Zeng Wei1,2 Lian Chengbo1,2, Luo Bing3, Shan Shujiao3, Zhou Tao4
1 Sichuan Province Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,Sichuan 2 The Sedimentary and Accumulation Department of Key Laboratory of Carbonate Reservoirs,PetroChina, Southwest Petroleum University,Chengdu 610500,Sichuan 3 Research Institute of Petroleum Exploration and Development,Southwest Oil and Gas Field Company, PetroChina,Chengdu 610501,Sichuan 4 Zigui County Bureau of Land and Resources,Yichang 443600,Hubei
Abstract：In this paper,the authors focused on grain bank of the Lower Cambrian Longwangmiao Formation in Moxi-Gaoshiti area,Sichuan Basin. Combined with abundant materials,such as drilling and logging data,cores and thin sections,the characteristics,distribution and its major controlling factors of grain bank in the Longwangmiao Formation were synthetically analyzed. There are two main rock types of grain bank in research area,one is grain dolostone with obvious granular structure,which is dominated by dolarenite and oolite dolostone,and the other is crystal grain dolostone with residual granular structure. Grain bank mainly has upward shallowing and granularity coarsening sequences,and could constitute sedimentary sequences of interact bank sea-grain bank and restricted lagoon-grain bank with lower fine-grained sediment in the vertical direction. In the lateral direction,grain bank has good continuity and is characterized by continuous distribution in a large area. On the plane,the development degree of grain bank increases gradually from northwest to southeast. Further analysis shows that the development characteristics and superimposed pattern of grain bank in the Longwangmiao Formation were determined by the relative sea-level change and sedimentary energy variation,the development horizon and degree of grain bank were formed by different grades of sea level fluctuation,and thepalaeogeomorphology finally determined the difference of planar distribution of grain bank during the depositional period of Longwangmiao Formation.
. Characteristics and distribution of grain bank of the Lower Cambrian Longwangmiao Formation in Moxi-Gaoshiti area, Sichuan Basin[J]. JOPC, 2015, 17(3): 347-358.
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