东海盆地西湖凹陷平湖斜坡天然气沿断层运移特征及运聚模式

郭刚; 苏圣民; 徐建永

doi:10.11781/sysydz2025061213

东海盆地西湖凹陷平湖斜坡天然气沿断层运移特征及运聚模式

doi: 10.11781/sysydz2025061213

中海油研究总院有限责任公司, 北京 100028

基金项目:

中国海油“十四五”重大科技项目“中国近海新区新领域勘探技术”之课题1“近海重点潜在富烃洼陷评价技术”(KJGG2022-0301)资助。

详细信息

作者简介:
郭刚(1976—)，男，博士，高级工程师，从事海洋油气勘探地质综合研究。E-mail:guok@sina.com。

通讯作者:
苏圣民(1994—)，男，博士，工程师，从事海洋油气成藏机理研究。E-mail:1196032219@qq.com。

中图分类号: TE121.3
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出版历程
- 收稿日期: 2025-06-10
- 修回日期: 2025-10-31
- 网络出版日期: 2025-11-26

Migration characteristics and migration-accumulation patterns of natural gas along faults in Pinghu Slope of Xihu Sag, East China Sea Basin

CNOOC Research Institute Company Limited, Beijing 100028, China

摘要

摘要:
断层是东海盆地西湖凹陷平湖斜坡天然气运移的主要通道，对油气差异性富集具有明显的控制作用。明确天然气沿断层运移特征及运聚模式，可有效指导西湖凹陷或相似地区油气有利运聚区的预测。为此，综合测录井、地震等资料，结合天然气组分和碳同位素、包裹体均一温度及丰度等分析测试数据，系统研究了天然气沿静止断层的运移特征，并进一步查明了天然气沿静止断层的运聚模式。结果表明，平湖斜坡天然气存在中新统玉泉组—柳浪组沉积期和上新统三潭组(或更新统东海群)沉积期至今的两期成藏。断层在天然气成藏期基本处于静止状态，且断裂带内部包裹体丰度值介于1%~5%之间，指示天然气沿静止断层发生了连续运移。平湖斜坡天然气等效成熟度为1.08%~1.23%，远高于本地烃源岩最大成熟度，说明其气源主要来自相邻洼陷高成熟烃源岩。油气运移路径示踪结果显示，A和B构造天然气以沿断层走向运移为主；H和J构造天然气以沿断层垂向和穿断侧向运移为主；C和F构造以沿断走向和穿断侧向运移为主。基于上述特征，确定了“阶梯式”、“走向式”、“走向—阶梯复合式”3种天然气沿断层运聚模式。
- 油气运移方向 /
- 运移特征 /
- 运聚模式 /
- 平湖斜坡 /
- 西湖凹陷 /
- 东海盆地
Abstract:
Faults are the main pathways for natural gas migration in Pinghu Slope of Xihu Sag, East China Sea Basin, and have obvious controlling effects on differential hydrocarbon accumulation. Clarifying the migration characteristics and migration-accumulation patterns of natural gas along faults can effectively guide the prediction of favorable hydrocarbon migration-accumulation areas in Xihu Sag and similar regions. Therefore, by integrating data from well logging, seismic surveys, and analytical test data including natural gas composition, carbon isotopes, inclusion homogenization temperatures, and abundance, the migration characteristics of natural gas along static faults were systematically studied, and the migration-accumulation patterns along static faults were further clarified. Results showed that there were two stages of hydrocarbon accumulation for natural gas in Pinghu Slope, namely, the depositional period of Miocene Yuquan Formation-Liulang Formation and the depositional period of Pliocene Santan Formation (or Pleistocene Donghai Group) to present. Faults were basically in static state during natural gas accumulation periods, and inclusion abundance values within fault zones ranged from 1% to 5%, indicating continuous migration of natural gas along static faults. The equivalent maturity of natural gas in Pinghu Slope was 1.08% to 1.23%, which was much higher than the maximum maturity of local source rocks, indicating that the gas source mainly came from high-maturity source rocks in adjacent sags. Hydrocarbon migration pathway tracing results showed that natural gas in A and B structures mainly migrated along fault strikes; natural gas in H and J structures mainly migrated vertically along faults and laterally across faults; natural gas in C and F structures mainly migrated along fault strikes and laterally across faults. Based on the above characteristics, three types of natural gas migration-accumulation patterns along faults were determined: "stepwise", "strike-parallel", and "strike-stepwise composite" patterns.
- hydrocarbon migration direction /
- migration characteristics /
- migration-accumulation patterns /
- Pinghu Slope /
- Xihu Sag /
- East China Sea Basin

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