Oil & Gas Geology ›› 2021, Vol. 42 ›› Issue (6): 1414-1422.doi: 10.11743/ogg20210615

• Petroleum Geology • Previous Articles     Next Articles

Application of standardized sequence stratigraphy theory in the shelf break-to-slope area: A case study of the Middle Miocene sedimentary sequence in the PRMB

Weitao Chen1(), Shaohua Xu2,*(), Zhen Sun3, Min He1, Jiali Yao1, Yingmin Wang4, Haiteng Zhuo5   

  1. 1. Shenzhen Branch of CNOOC Ltd., Shenzhen, Guangdong 518000, China
    2. Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development, Chongqing University of Science & Technology, Chongqing 401331, China
    3. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, Guangdong 510301, China
    4. Ocean College, Zhejiang University, Zhoushan, Zhejiang 316021, China
    5. School of Marine Sciences, Sun Yat-sen University, Zhuhai, Guangdong 519082, China
  • Received:2020-04-20 Online:2021-12-28 Published:2021-12-16
  • Contact: Shaohua Xu E-mail:chenwt2@cnooc.com.cn;xsh_xu@163.com

Abstract:

The application of standardized sequence stratigraphy theory is yet to be improved in the shelf break-to-slope area in deep water. As of now, the researches on the sequence stratigraphic framework mostly focus on deep-water channels or interior basin floor fans (BFFs) based on the high-resolution seismic data of shallow layers and outcrop observation, while ignoring systematic correlation with the upper slope and shelf system. In this regard, the study sets up a uniform sequence stratigraphic framework running from continental shelf to slope on the basis of systematic interpretation, attribute extraction and visualization of 3D seismic data, as well as analysis of drilling and logging data, while applying the standardized sequence stratigraphy theory to the Middle Miocene (around 13.8 Ma) shelf break-to-slope area in deep water in the Pearl River Mouth Basin (PRMB). As shown by the newly established framework, deposit sedimentary sequences in both transgressive systems tract (TST) and highstand systems tract (HST) are extremely thin as a whole; foreset beds of the falling stage systems tract (FSST) and lowstand systems tract (LST), however, are much thicker, and bottomset beds (mainly of deep-water fan) are widely developed in the LST. In a nutshell, the establishment of deep-water sequence stratigraphic framework is supposed to have a holistic consideration from shelf break to deep-water areas at first; 3D systematic comparison of seismic events is to be followed while analyzing the evolutionary features of "Source-to-Sink" system, with a view to better dissecting the system tracts and understanding the coupling relationship of shelf, slope and deep-water sedimentary facies.

Key words: shelf break-to-slope area, deep-water fan, standardization, sequence stratigraphy, Middle Miocene, Pearl River Mouth Basin (PRMB)

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