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<p>To elucidate the formation and evolution of overpressure in the Yinggehai Basin, numerical basin modeling and fluid inclusion trapping pressure calculations were conducted to reconstruct the evolution of formation pressure and to investigate the controlling effects of overpressure on natural gas accumulation. The study reveals that the Yinggehai Basin generally exhibits a characteristic of rapid late-stage pressurization, with differences in the overpressure evolution processes between the northern and southern parts of the basin. In the northern Dongfang area, overpressure developed earlier (5.5 Ma) but increased slowly in the later stages, whereas in the southern Ledong area, overpressure developed later (2.5 Ma) but increased rapidly and to a higher degree in the later stages. The formation of overpressure is attributed to two main factors: First, the rapid development of under-compaction overpressure in mudstones under high sedimentation rates; second, the rapid burial and heating of source rocks, leading to the rapid maturation of organic matter and the onset of hydrocarbon generation and expulsion, which enhances the contribution of hydrocarbon generation to overpressure. Since the deposition of the Pliocene strata, the sedimentation rate has been higher in the south than in the north, which is highly consistent with the overpressure evolution process, indicating that the development of overpressure in the basin is controlled by changes in sedimentation rates. Overpressure is a key factor controlling natural gas accumulation in the Yinggehai Basin: (1) The high-temperature and high-pressure environment plays a controlling role in the preservation of high-quality reservoirs; (2) strong overpressure controls the development of efficient conduits such as diapirs, faults, and hydraulic fractures, which are crucial for natural gas accumulation in the middle and deep layers; (3) the development of overpressure controls the periodic accumulation and release of fluids, which is closely related to episodic hydrocarbon charging and rapid natural gas accumulation, serving as an important dynamic source for natural gas accumulation.</p>

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Formation and evolution of overpressure and its control on hydrocarbon accumulation in the Yinggehai Basin

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Lu Yang,
  • Lin Hu,
  • Gaowei Hu,
  • Yazhen Zhang,
  • Jinqiang Tian,
  • Fang Hao,
  • Zonglin He,
  • Yue Xue,
  • Xuezhe Li,
  • Ziqi Feng,
  • Chunlei Li,
  • Baibing Yang

摘要

To elucidate the formation and evolution of overpressure in the Yinggehai Basin, numerical basin modeling and fluid inclusion trapping pressure calculations were conducted to reconstruct the evolution of formation pressure and to investigate the controlling effects of overpressure on natural gas accumulation. The study reveals that the Yinggehai Basin generally exhibits a characteristic of rapid late-stage pressurization, with differences in the overpressure evolution processes between the northern and southern parts of the basin. In the northern Dongfang area, overpressure developed earlier (5.5 Ma) but increased slowly in the later stages, whereas in the southern Ledong area, overpressure developed later (2.5 Ma) but increased rapidly and to a higher degree in the later stages. The formation of overpressure is attributed to two main factors: First, the rapid development of under-compaction overpressure in mudstones under high sedimentation rates; second, the rapid burial and heating of source rocks, leading to the rapid maturation of organic matter and the onset of hydrocarbon generation and expulsion, which enhances the contribution of hydrocarbon generation to overpressure. Since the deposition of the Pliocene strata, the sedimentation rate has been higher in the south than in the north, which is highly consistent with the overpressure evolution process, indicating that the development of overpressure in the basin is controlled by changes in sedimentation rates. Overpressure is a key factor controlling natural gas accumulation in the Yinggehai Basin: (1) The high-temperature and high-pressure environment plays a controlling role in the preservation of high-quality reservoirs; (2) strong overpressure controls the development of efficient conduits such as diapirs, faults, and hydraulic fractures, which are crucial for natural gas accumulation in the middle and deep layers; (3) the development of overpressure controls the periodic accumulation and release of fluids, which is closely related to episodic hydrocarbon charging and rapid natural gas accumulation, serving as an important dynamic source for natural gas accumulation.