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How much systems-tract scale, three-dimensional stratigraphic variability is present in sequence stratigraphy? An answer from the middle Miocene Pearl River Mouth Basin

Xu Shaohua, Han Jianhui, Wang Yingmin, He Min, Pang Xiong, Chen Weitao, Gong Chenglin, Qin Chunyu, Li Xiaogang and Xu Shang
How much systems-tract scale, three-dimensional stratigraphic variability is present in sequence stratigraphy? An answer from the middle Miocene Pearl River Mouth Basin
AAPG Bulletin (June 2020) 104 (6): 1261-1285

Abstract

Prior sequence stratigraphic methods mainly employed two-dimensional (2-D) stacking patterns to reconstruct stratigraphic frameworks. The future of sequence stratigraphy will pay more attention to systems-tracts scale and three-dimensional (3-D) stratigraphic variability. Using 1.2X10 (super 4) km (super 2) (4.63X10 (super 3) mi (super 2) ) 3-D seismic data, tied to regional 2-D seismic lines and 21 boreholes, the present study examines systems-tract scale and 3-D stratigraphic variability of the 14.8-13.8 Ma Pearl River shelf-margin to deep-water sedimentary prisms. The studied prisms were divided into four main systems tracts, namely, highstand systems tract (HST), falling-stage systems tract (FSST), lowstand systems tract (LST), and transgressive systems tract (TST). Each systems tract is represented by a given clinoformal architecture and stacking pattern: (1) clinothem sets with aggradation to progradation are HST, (2) clinothem sets with progradation to degradation (PD) are FSST, (3) clinothem sets with progradation to aggradation (PA) are LST, and (4) clinothem sets with retrogradation are TST, LST, or HST. In addition, Pearl River FSST and LST display downdip stratigraphic variabilities which are regionally manifested in at least three ways: (1) shelf-edge deltas linked downdip to basin-floor fans, (2) shelf-edge deltas linked downdip without fans, and (3) basin-floor fans linked updip that lack deltas. In along-strike orientation, the Pearl River FSST could exhibit low-angle progradation, not just PD stacking. The LST could present retrogradational stacking, not just PA stacking. Therefore, the physical position of a systems tract is reemphasized in terms of assigning a given systems tract. The concepts of three systems tracts are then revised for chronostratigraphic significance. The LST is the lowermost systems tract of a sequence, presenting a normal regression of the shoreline as its diagnostic characteristic and including contemporaneous stratigraphic units laterally. The HST is the upper systems tract of a sequence, providing a normal regression of the shoreline as its diagnostic characteristic and including contemporaneous stratigraphic units laterally. The TST is the middle systems tract of a sequence, generating a backstep of the shoreline and excluding contemporaneous onlapping units of both the LST and HST laterally. The FSST has not been revised because FSST may be a supply-independent feature.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 104
Serial Issue: 6
Title: How much systems-tract scale, three-dimensional stratigraphic variability is present in sequence stratigraphy? An answer from the middle Miocene Pearl River Mouth Basin
Affiliation: Chongqing University of Science and Technology, Laboratory of Complex Oil and Gas Field Exploration and Development, Chongqing, China
Pages: 1261-1285
Published: 20200615
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 65
Accession Number: 2020-047231
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. col., 1 table, geol. sketch maps
N19°00'00" - N22°00'00", E112°00'00" - E116°00'00"
Secondary Affiliation: Chengdu University of Technology, CHN, ChinaZhejiang University, CHN, ChinaChina National Offshore Oil Corporation, CHN, ChinaChinese Academy of Sciences, South China Sea Institute of Oceanology, CHN, ChinaChina University of Petroleum, CHN, ChinaChina University of Geosciences, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 202013
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