Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 1-12.doi: 10.12108/yxyqc.20250601

• PETROLEUM EXPLORATION • Previous Articles    

Hydrocarbon accumulation condition and main controlling factors of Miocene Sanya Formation in Yingdong slope area, Yinggehai Basin

CHEN Zhihong1, LYU Zhengxiang2,3, HU Gaowei1, GAO Mengtian1, CHEN Yabing1, JIN Feng1, MENG Hongyu1   

  1. 1. Hainan Branch of CNOOC(China) Co., Ltd., Haikou 570311, China;
    2. College of Energy(College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu 610059, China;
    3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
  • Received:2025-04-15 Revised:2025-05-13 Published:2025-11-07

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Abstract: Based on analysis and experiment data of fluid inclusions, hydrocarbon generation thermal simulation, TOC, physical properties and casting thin sections, combined with burial-thermal history, the geological condition, accumulation process, and main controlling factors of Miocene Sanya Formation in Yingdong slope area of Yinggehai Basin were systematically studied, and hydrocarbon accumulation models were established. The results show that: (1) The organic matter type of Miocene Sanya Formation source rocks in Yingdong slope area of Yinggehai Basin is dominated by humic kerogen, with average TOC values of 0.77% and 1.21% in the northern and southern sections, respectively. The average TOC value of Oligocene coal-bearing source rocks is 1.41%. The evolution characteristics of Oligocene and Miocene source rocks in Yingdong slope area are as follows: early shallow burial, long-term immaturity-low maturity stage, late rapid deep burial, short-term rapid entry into maturity-high maturity evolution stage. The evolution degree of source rocks in the near-sag area of the southern section is the highest, followed by the slope area of the southern section, the near-sag area of the middle section and the northern section, and the evolution degree of the slope area of the middle section is the lowest. The average porosity of reservoir in the northern section is 13.56%, and the main peak of permeability is 0.1-1.0 mD. The average porosity of the southern section is 11.53%, and the main peak of permeability is 1.0-10.0 mD, the permeability is significantly better than that of the northern section, and the reservoir space is mainly composed of dissolved pores. The composite transport system composed of continuous active strike-slip faults, derived fractures and large-scale sandbodies with relatively good physical properties ensured the efficient three-dimensional migration of natural gas.(2) The natural gas component of Sanya Formation is mainly CH4, with a median volume fraction of 83.16%, mainly coal-type gas. Natural gas of the northern section mainly comes from Sanya Formation and the underlying Oligocene, while the maturity of natural gas in the southern section is 1.3%-1.7%, significantly higher than that of the northern section, mainly from the underlying Oligocene.(3) Characteristics of Sanya Formation gas reservoir are"multi-stage continuous filling and late-stage accumulation". Both the northern and southern sections have undergone three-stage of oil and gas charging, with the main charging period being Pleistocene. The main charging time of oil and gas in the southern section(3.5-1.0 Ma)is earlier than that in the northern section(2.2-1.0 Ma). The filling abundance of the southern section is higher than that of the northern section.(4) Accumulation characteristics of Sanya Formation are"strike-slip fault controlling hydrocarbon, source superimposed tectonic activity controlling reservoir, superposition of strike-slip fault activity-fracture overpressure activation controlling transportation". The source rock evolution, transport efficient and reservoir features are the main controlling factors for natural gas accumulation.

Key words: strike-slip fault, late-stage accumulation, Sanya Formation, Miocene, Yingdong slope area, Yinggehai Basin

CLC Number: 

  • TE122.1
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