Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 103-112.doi: 10.12108/yxyqc.20230210

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Ternary seismic configuration interpretation technology of Paleogene Wenchang Formation in Panyu 4 depression, Pearl River Mouth Basin

HUANG Junli1, ZHANG Wei1, LIU Lihui2, CAI Guofu1, ZENG Youliang1, MENG Qingyou1, LIU Hao2   

  1. 1. Shenzhen Branch of CNOOC Ltd., Shenzhen 518000, Guangdong, China;
    2. Beijing Rockstar Petroleum Technology, Beijing 100089, China
  • Received:2022-04-28 Revised:2022-07-04 Online:2023-03-01 Published:2023-03-07

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Abstract: Under the framework of source-to-sink system, the sedimentary facies, palaeogeomorphology and seismic configuration attribute slices of Paleogene Wenchang Formation in Panyu 4 depression of the Pearl River Mouth Basin were studied based on seismic configuration analysis, the sedimentary units were divided, the boundaries of each sedimentary unit were defined qualitatively and semi quantitatively, and two exploration potential zones were selected. The results show that:(1) Three types of source-to-sink systems of Paleogene Wenchang Formation were found in Panyu 4 depression of the Pearl River Mouth Basin. A gentle slope divergent source-to-sink system is developed in the northwest, which is characterized by the dynamic evolution of fan delta, lake and braided river delta in the vertical direction, and the seismic configuration changes from medium-strong reflection sheet filling to medium-weak amplitude parallel reflection, and then to high-frequency medium amplitude progradation reflection. A long axis convergent source-to-sink system is developed in the southwest, and the braided river delta is developed stably, which is mainly wedge-shaped in configuration. A steep slope parallel source-to-sink system is developed in the hanging wall of fault controlling depression with stable multi-stage overlapped fan delta, which is generally characterized by a wedge-shaped configuration, reflecting the sedimentary characteristics of fan delta plain-front under the background of abundant sources.(2) The sedimentary palaeogeomorphology of Wenchang Formation in the study area is generally faulted in the east and superposed in the west. During the deposition of the fifth and fourth members of Wenchang Formation, it was in a strong fault depression period. Local tectonic movement raised the northwest and southeast, and a structural ridge and two sub depressions formed in the central part. During the deposition of the third and second member of Wenshan Formation, it entered fault depression period, the sedimentation center moved eastward as a whole, the lake basin shrank, and the western strata were denuded.(3) Seven sedimentary units are developed in the gentle slope divergent source-to-sink area of the study area, which are mainly superimposed underwater distributary channels and thin sheet sand in fan delta front. Four sedimentary units are developed in the long axis convergent source-to-sink area, which are dominated by underwater distributary channels and widely distributed front sheet sand in braided river delta front. In the steep slope parallel source-to-sink area, there are four sedimentary units, including underwater fan, fan delta front, turbidite fan.(4) The long axis convergent source-to-sink system in the southwest and the gentle slope divergent source-to-sink system in the northwest are the exploration potential areas in the study area.

Key words: source-to-sink system, ternary seismic configuration, paleogeomorphology, Wenchang Formation, Paleogene, Panyu 4 depression, Pearl River Mouth Basin

CLC Number: 

  • TE122.2
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