西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (2): 15-25.DOI: 10.11885/j.issn.1674-5086.2022.06.08.03

• 地质勘探 • 上一篇    下一篇

川中大安寨段页岩排烃效率及其勘探启示

张本健1, 路俊刚2,3, 张芮1, 蒋奇君2, 肖正录2,3   

  1. 1. 中国石油西南油气田公司勘探开发研究院, 四川 成都 610051;
    2. 西南石油大学地球科学与技术学院, 四川 成都 610500;
    3. 天然气地质四川省重点实验室, 四川 成都 610500
  • 收稿日期:2022-06-08 出版日期:2024-04-10 发布日期:2024-05-11
  • 通讯作者: 路俊刚,E-mail:lujungang21@sohu.com
  • 作者简介:张本健,1980年生,男,汉族,四川绵阳人,高级工程师,博士,主要从事含油气盆地地质勘探方面的研究工作。E-mail:zbjian@petrochina.com.cn;路俊刚,1980年生,男,汉族,山东潍坊人,教授,博士,主要从事油气地质与成藏地球化学方面的研究。E-mail:lujungang21@sohu.com;张芮,1991年生,男,汉族,四川成都人,工程师,硕士,主要从事致密油气地质方面的研究。E-mail:zhangrui-2018@petrochina.com;蒋奇君,2000年生,女,汉族,四川广安人,硕士,主要从事非常规油气地质等方面的研究。E-mail:2830789417@qq.com;肖正录,1994年生,男,汉族,甘肃武威人,实验师,博士,主要从事非常规油气地质等方面的研究。E-mail:xiaozl@163.com
  • 基金资助:
    中国石油-西南石油大学创新联合体科技合作项目(2020CX050000)

Hydrocarbon Expulsion Efficiency of Shale in the Da$'$anzhai Member of Central Sichuan Basin and Its Exploration Enlightenment

ZHANG Benjian1, LU Jungang2,3, ZHANG Rui1, JIANG Qijun2, XIAO Zhenglu2,3   

  1. 1. Research Institute of Exploration and Development, Southwest Oil and Gas Field Company, PetroChina, Chengdu, Sichuan 610051, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. Natural Gas Geology Key Laboratory of Sichuan Province, Chengdu, Sichuan 610500, China
  • Received:2022-06-08 Online:2024-04-10 Published:2024-05-11

摘要: 烃源岩的排烃效率是油气资源评价中的重要参数,排烃效率的研究既可以指导资源评价,又可以作为验证资源评价结果可靠性的重要科学手段。基于目前生烃潜力法的缺陷,提出了改进的生烃潜力法,并利用此方法求取了四川盆地中部侏罗系大安寨段页岩的排烃效率。研究结果表明,当前地质条件下,大安寨段页岩的排烃效率分布于 0~62.6%。随着有机质成熟度(Ro)的增加,排烃效率逐渐上升,含油饱和度指数先增加后降低。 Ro 处于0.95%~1.72%,含油饱和度指数大于 100 mg/g,页岩层系的可动烃含量较高。岩相组合对排烃效率具有明显的影响,在纵向上有页岩向介壳灰岩排烃的趋势,相较于纯页岩储层而言,互层型组合层间缝发育,有利于页岩油流动和产出。综合认为, Ro>1.25% 的大一亚段下部互层型组合是大安寨段页岩油的重点勘探目标。该成果可为川中侏罗系大安寨段页岩油的勘探开发提供理论指导。

关键词: 四川盆地, 大安寨段, 页岩油, 排烃效率, 生烃潜力法

Abstract: The hydrocarbon expulsion efficiency of source rock is an important parameter in petroleum resources assessment. The study of hydrocarbon expulsion efficiency can not only guide the resource evaluation, but also be an important scientific means to verify the reliability of the resource evaluation results. To remedy the defects of current hydrocarbon generation potential method, an improved hydrocarbon generation potential method is proposed, and the hydrocarbon expulsion efficiency of shale in the Jurassic Da$'$anzhai Member of central Sichuan Basin was obtained by using this method. The results show that under the current geological conditions, the hydrocarbon expulsion efficiency of the shale in the Da$'$anzhai Member is distributed between 0${\sim}$62.6{\percent}. With the increase of organic matter maturity, the hydrocarbon expulsion efficiency gradually increases, and the oil saturation index increases first and then decreases. When $R_{\rm o}$ is in the range of 0.95%${\sim}$1.72%, oil saturation index is greater than 100 mg/g, and the movable hydrocarbon content of shale strata is higher. The lithofacies combination has a significant effect on the hydrocarbon expulsion efficiency. In the longitudinal direction, there is a tendency for shale to expel hydrocarbon from shell limestone, the development of interlayer fractures in interbedded combinations is conducive to shale oil flow and production. It is concluded that the interbedded assemblage in the lower part of the first submember in the area with $R_{\rm o}$>1.25% is the key exploration target for shale oil in the Da$'$anzhai Member. The results can provide theoretical guidance for the exploration and development of shale oil in the Jurassic Da$'$anzhai Member of central Sichuan Basin.

Key words: Sichuan Basin, Da′anzhai Member, shale oil, expulsion efficiency, hydrocarbon generation potential method

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