冀中坳陷文安斜坡潜山带天然气成因与成藏特征
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本文为中国石油天然气股份有限公司重大科技专项“华北油田持续有效稳产勘探开发关键技术研究与应用”(编号2017E- 15)、华北油田公司校企合作课题(编号HBYT- YJY- 2018- JS- 177)联合资助的成果。


Natural gas origin and accumulation characteristic of the Wenan slope buried- hill belts in the Jizhong sub- basin, Bohai Bay basin
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    摘要:

    冀中坳陷潜山天然气是渤海湾盆地深层—超深层油气勘探的重要领域,文安斜坡潜山带则是冀中坳陷深潜山天然气勘探的主战场,但关于文安斜坡潜山带内、中、外三个不同含气带的油气来源、成藏期次和成藏过程等缺乏系统研究。本文在对各带天然气组分、碳同位素、稀有气体同位素和轻烃化合物等分析的基础上,探讨了天然气的成因与来源,利用流体包裹体方法厘清不同潜山带油气成藏充注过程,继而建立了油气成藏模式,并对比分析不同含气带油气成藏差异性。结果表明,文安斜坡潜山带内带天然气为高—过成熟的油型气,主要来源于Es4 +Ek烃源岩,储层经历了两期不同成熟度的天然气充注过程;中带天然气主要为煤型气,主要来源于石炭- 二叠纪煤系烃源岩,混有部分Es4 +Ek烃源岩生成的天然气,具有两期油气充注过程;而外带天然气为低成熟阶段的生物- 热催化过渡带气经氧化改造而形成的次生生物气,主要来源于石炭- 二叠纪烃源岩,仅经历了一期天然气充注过程。综合分析表明,文安斜坡潜山带发育双源供烃- 断层不整合输导- 分带差异聚集的油气成藏模式,内、中、外三个含气带分别发育单向单源供烃似层状高—过成熟气藏、双向双源供烃断溶体成熟—高成熟油气藏以及单向单源供烃层状低熟- 生物气藏三种油气藏类型。本文结果为深化对该区天然气来源、成藏规律的认识和后续勘探领域的拓展提供有益的信息。

    Abstract:

    The natural gas in the Wenan slope buried- hill belts, Jizhong sub- basin has become an important target area for the deep and ultra- deep reservoir explorations in the Bohai Bay basin. However, the gas sources, charging history and gas accumulation process lack systematic research. In this paper, the identification of gas origin and source is conducted based on the chemical and stable carbon isotopic compositions, rare gas isotopic compositions and light hydrocarbons. The fluid inclusions analysis is applied to reveal the charging history and a gas accumulation model is established. Finally, the differences in the gas accumulation from three belts are compared. The results show that the natural gas in the inner belt is high- mature oil- associated gas, mainly derived from Es4 +Ek source rock, and the gas reservoirs have experienced two different maturity of natural gas filling process. The natural gas in the middle belt is coal- derived gas, mainly derived from the C- P coal- measure source rocks, mixed some gases from Es4+Ek source rock, and the gas reservoirs have the characteristics of two different maturity of hydrocarbon fillings. The gases in the outward belt are biothermal- catalyzed transition zone gases at low maturity stage through oxidation modification. A comprehensive analysis of the Wenan slope buried- hill belts is used to develop a model of “dual source hydrocarbon supply- fault unconformity transport- zoning difference accumulation”, which developed into three types of reservoirs in the three belts: ① one- way single- source hydrocarbon- supply, stratified high- over- mature gas reservoirs; ② two- way two- source hydrocarbon- supply, fault- corrosion blocked mature to highly mature oil- gas reservoirs; and ③ one- way single- source hydrocarbon- supply, stratified low- mature/biological gas reservoirs.

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田建章,张锐锋,李小冬,王鑫,曾婷,罗静,赵梅红,卢山,潘清华,焦亚先,毛崇昊.2022.冀中坳陷文安斜坡潜山带天然气成因与成藏特征[J].地质学报,96(4):1434-1446.
Tian Jianzhang, Zhang Ruifeng, Li Xiaodong, Wang Xin, Zeng Ting, Luo Jing, Zhao Meihong, Lu Shan, Pan Qinghua, Jiao Yaxian, Mao Chonghao.2022. Natural gas origin and accumulation characteristic of the Wenan slope buried- hill belts in the Jizhong sub- basin, Bohai Bay basin[J]. Acta Geologica Sinica,96(4):1434-1446.

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  • 收稿日期:2020-10-20
  • 最后修改日期:2020-11-28
  • 录用日期:2020-11-29
  • 在线发布日期: 2021-02-26