石油与天然气地质 ›› 2025, Vol. 46 ›› Issue (1): 1-14.doi: 10.11743/ogg20250101

• 院士论坛 • 上一篇    下一篇

基于源-储单元的页岩油气甜点段评价优选新思路

郭旭升1,2(), 申宝剑1,2,3(), 王鹏威1,2,3, 卢龙飞1,2, 李倩文1,2,3, 王冠平1,2,3, 常佳琦1,2,3, 刘伟新1,2, 李楚雄1,2, 何晋译1,2   

  1. 1.页岩油气富集机理与高效开发全国重点实验室,北京 102206
    2.中国石化 石油勘探开发研究院,北京 102206
    3.中国石化页岩油气勘探开发重点实验室,北京 102206
  • 收稿日期:2024-10-18 修回日期:2024-12-16 出版日期:2025-02-28 发布日期:2025-03-03
  • 通讯作者: 申宝剑 E-mail:guoxs@sinopec.com;shenbj.syky@sinopec.com
  • 第一作者简介:郭旭升(1965—),男,中国工程院院士,油气勘探研究与生产管理。E⁃mail:guoxs@sinopec.com
  • 基金项目:
    国家自然科学基金项目(U24B6002)

A new approach to the evaluation and optimal selection of shale oil and gas sweet-spot intervals based on source rock-reservoir units

Xusheng GUO1,2(), Baojian SHEN1,2,3(), Pengwei WANG1,2,3, Longfei LU1,2, Qianwen LI1,2,3, Guanping WANG1,2,3, Jiaqi CHANG1,2,3, Weixin LIU1,2, Chuxiong LI1,2, Jinyi HE1,2   

  1. 1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development,Beijing 102206,China
    2.Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 102206,China
    3.Key Laboratory of Shale Oil/Gas Exploration and Production Technology,SINOPEC,Beijing 102206,China
  • Received:2024-10-18 Revised:2024-12-16 Online:2025-02-28 Published:2025-03-03
  • Contact: Baojian SHEN E-mail:guoxs@sinopec.com;shenbj.syky@sinopec.com

摘要:

目前行业内尚未从页岩油气统一性的角度建立甜点段评价参数与标准体系。总有机碳含量(TOC)被认为是必不可少的评价参数,但仅仅利用TOC作为主要参数进行甜点评价而不充分考虑页岩油气储集条件的重要性,会导致评价结果与最优甜点段偏离。在研究中国页岩油气甜点段类型特征的基础上,提出了基于源-储单元的页岩油气甜点段评价新思路,并结合典型地区和典型页岩层系甜点段,提出了该方法的评价流程。源-储分离型页岩油气甜点段的孔隙度与含油/气性正相关,孔隙度是甜点段优选的关键参数;源-储一体型页岩油气甜点段的TOC与含油/气性正相关,无论是TOC还是孔隙度均可作为是甜点段评价的关键参数;源-储共生型页岩油气甜点段的含油/气性受TOC和孔隙度共同控制,只有综合考虑两者才能准确地评价甜点段。页岩油气甜点段评价应聚焦良好的储集层段,而非高有机质丰度层段。今后在页岩油气甜点段评价方法体系中,应对储集条件予以更多考虑,增加孔-缝-纹一体化储集条件评价,并结合地球物理甜点评价技术,提高甜点评价的准确性。

关键词: 孔隙度, TOC, 甜点段, 源-储单元, 页岩油气

Abstract:

There is a lack of a unified parameter and criterion system for optimal selection of shale oil and gas sweet-spot intervals at present. Although the total organic carbon (TOC) content is widely considered an essential parameter for the selection, the parameter alone may be insufficient to accurately evaluate sweet-spot without adequate consideration of shale reservoir conditions, resulting in deviation of evaluation results from the optimal sweet-spot intervals. Given this, we categorize the shale oil and gas sweet spots in China, and propose a new approach to the evaluation of shale oil and gas sweet-spot intervals based on source rock-reservoir units. Furthermore, an evaluation process of the new approach is proposed combining the analysis of typical regions and typical shale formations in China. The analytical results reveal that the source rock-reservoir units can be categorized into three types: separated, integrated, and paragenetic types. For separated source rock-reservoir units, the shale oil and gas sweet-spot intervals are characterized by a positive correlation between porosity and oil/gas-bearing properties, establishing porosity as the key parameter for selecting optimal sweet-spot intervals. For integrated source rock-reservoir units, the shale oil and gas sweet-spot intervals feature a positive correlation between the TOC content and oil/gas-bearing properties. This indicates that both the TOC content and porosity can serve as key parameters for the evaluation. In contrast, for paragenetic source rock-reservoir units, the oil/gas-bearing properties of shale oil and gas sweet-spot intervals are jointly governed by the TOC content and porosity, both of which should be jointly considered for accurate evaluation. The abovementioned analyses indicate that the evaluation of the shale oil and gas sweet-spot intervals should focus on favorable reservoir intervals rather than those with high organic matter abundance. Therefore, priority should be given to reservoir conditions in the evaluation methodology for optimal selection of shale oil and gas sweet-spot intervals. Specifically, it is necessary to introduce the integrated evaluation of reservoir conditions in terms of pores, fractures, and lamina and develop geophysical evaluation technologies in order to improve the evaluation accuracy.

Key words: porosity, total organic carbon (TOC), sweet-spot interval, source rock-reservoir unit, shale oil and gas

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