TITLE:
Method and Description of Sedimentary System Characterization Based on Sequence Stratigraphy
AUTHORS:
Jianmin Zhang, Hui Cai, Honglin Yue, Pengfei Mu
KEYWORDS:
Middle Section of Shasan, Sequence Stratigraphy, Sedimentary System, Characterization
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.12 No.5,
May
20,
2024
ABSTRACT: A Oilfield is the most representative mid to deep oil field in the Bohai Sea, with the main oil bearing intervals being the upper and middle Shahejie-3 sections of the Paleogene Shahejie Formation. By combining well seismic analysis, the middle section of Shahejie-3 is divided into high-level system tract and forced lake retreat system tract, corresponding to the II oil formation and I oil formation, respectively. Using sequence stratigraphy methods, based on seismic profiles and drilling lithological cycles, the high stand system tract is divided into 5 stages of delta progradation. The first and second stages are high angle S-type progradation with large sedimentary thickness, the third stage is oblique progradation, and the fourth and fifth stages are S-oblique composite progradation; By combining seismic data, we characterized the large-scale (8 small-scale) progradation bodies of 5 periods, clarified the distribution characteristics of reservoir planes, and laid the foundation for the later exploration of oilfield potential.