Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 116-130.doi: 10.12108/yxyqc.20220211

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics of oolitic beach of Triassic Feixianguan Formation in eastern Kaijiang-Liangping trough, Sichuan Basin

LI Yang1,2, WANG Xingzhi1,2, PU Baiyu3, XU Changhai3, YANG Xiyan1,2, ZHU Yiqing4, HUANG Zisang1,2, KANG Jiahao1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
    2. School of Geoscienceand Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    4. Shale Gas Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China
  • Received:2021-09-05 Revised:2021-12-08 Online:2022-03-01 Published:2022-03-14

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Abstract: In order to clarify the temporal and spatial distribution characteristics of oolitic beach under the sequence stratigraphic framework of Triassic Feixianguan Formation in eastern Kaijiang-Liangping trough in Sichuan Basin, and the control mechanism of sea-level change on oolitic beach migration, lithologic characteristics analysis, identification of sedimentary structural markers and division of sequence stratigraphic framework of sequence boundary were carried out.The results show that:(1) Two third-order sequences(SQ1 and SQ2) are developed in Feixianguan Formation in eastern Kaijiang-Liangping trough under the background of continuous regression, which can be further subdivided into five fourth-order sequences(Ⅰ to Ⅴ) (. 2) The oolitic beach of Feixianguan Formation is mainly developed in sequenceⅠ to Ⅳ, and the oolitic beach in sequence Ⅱ is the most developed, with large single thickness and good continuity, while the sedimentary thickness of oolitic beach in sequence Ⅲ, Ⅰ and Ⅳ decreases in turn, and the least developed oolitic beach is with discontinuous and sporadic distribution.(3) Besides vertical aggradation, oolitic beach has obvious lateral migration characteristics, migrating from the interior of the platform to the slope as a whole, and the lateral migration of oolitic beach in sequence I to is the most obvious. (4) The high-frequency cycles in local highlands and the production rate of carbonate rocks change synergistically, resulting in vertical aggradation and multi-stage superposition of oolitic beach of Feixianguan Formation in the study area. When the sea level drops below the base level, the hydrodynamic conditions suitable for beach growth change from local highlands to local depressions, resulting in the change of oolitic beaches from vertical growth to lateral progradation.(5) On the plane, the oolitic beach of Feixianguan Formation in the study area is mainly distributed along NW-SE direction(platform edge), most developed in Tieshanpo and Puguang areas, followed by Dukouhe, Qilibei and Luojiazhai areas. The research results can provide a basis for the exploration of highquality beach facies reservoirs of Feixianguan Formation in Kaijiang-Liangping trough.

Key words: oolitic beach, sequence, sea-level change, Feixianguan Formation, Triassic, Kaijiang-Liangping trough, Sichuan Basin

CLC Number: 

  • TE122.2
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