Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 19-30.doi: 10.12108/yxyqc.20240302

• PETROLEUM EXPLORATION • Previous Articles    

Cyclostratigraphy analysis and stratigraphic division of lower Sha-3 member of Paleogene in Zhanhua Sag，Bohai Bay Basin

FANG Xuqing1, ZHONG Qi2, ZHANG Jianguo2, LI Junliang3, MENG Tao3, JIANG Zaixing2, ZHAO Haibo1   

  1. 1. Manage Center of Oil and Gas Exploration, Shengli Oilfield Company, Sinopec, Dongying 257001, Shandong, China;
    2. College of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    3. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China
  • Received:2023-01-20 Revised:2023-03-10 Published:2024-04-30

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Abstract: Lacustrine fine-grained sediments often have continuity and can record and preserve significant astronomical cycle signals, making them ideal strata for astronomical cycle analysis. MTM spectrum analysis and FFT evolutionary harmonic analysis were conducted for natural gamma data of the lower Sha-3 member of key wells in Zhanhua Sag, Bohai Bay Basin, a“floating”astronomical timescale was established, astronomical cyclostratigraphic division of single well and well-tie stratigraphic correlation were carried out, and the stratigraphic frame-work was established. The results show that:（1）Significant astronomical cycle signals were recorded in the lower Sha-3 member in Zhanhua Sag, and the optimal sedimentation rate was matched to be 9.0×103 cm/Ma. The cycle thicknesses corresponding to long eccentricity, short eccentricity, obliquity and precession cycle are 42.3 m, 9.0 m, 2.4-4.7 m and 1.3-1.9 m, respectively.（2）Six long eccentricity cycles and 25 short eccentricity cycles were stably recorded in the lower Sha-3 member, and the short eccentricity curves can be used as the stratigraphic division interface for high-precision stratigraphic correlation.（3）The application of astronomical cycle theory to predict the development patterns and spatial configuration relationships of lithofacies can provide a basis for the precise exploration of geological“sweet spots”of shale oil and gas in the sedimentary

Key words: lacustrine fine-grained sediment, astronomical timescale, astronomical cycle, high-precision stratigraphic correlation, long eccentricity cycle, short eccentricity cycle, lower Sha-3 member, Paleogene, Zhahua Sag, Bohai Bay Basin

CLC Number: 

  • TE121.3+4
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