岩性油气藏 ›› 2022, Vol. 34 ›› Issue (1): 95–105.doi: 10.12108/yxyqc.20220110

• 勘探技术 • 上一篇    下一篇

川南长宁地区五峰组—龙马溪组页岩气评价新方法

温康1,2, 闫建平1,2,3, 钟光海4, 井翠5, 唐洪明2, 王敏6, 王军6, 胡钦红7, 李志鹏6   

  1. 1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500;
    2. 西南石油大学地球科学与技术学院, 成都 610500;
    3. 中国地质大学构造与油气资源教育部重点实验室, 武汉 430074;
    4. 中国石油西南油气田公司页岩气研究院, 成都 610500;
    5. 四川长宁天然气开发有限责任公司, 成都 610051;
    6. 中石化胜利油田勘探开发研究院, 山东东营 257015;
    7. 美国德克萨斯大学阿灵顿分校地球与环境科学系, 阿灵顿 76019
  • 收稿日期:2021-05-12 修回日期:2021-07-29 发布日期:2022-01-21
  • 通讯作者: 闫建平（1980—），男，博士，教授，主要从事测井地质学及非常规油气测井评价方面的教学与研究工作。Email：yanjp_tj@163.com。 E-mail:yanjp_tj@163.com
  • 作者简介:温康(1997-),男,西南石油大学在读硕士研究生,研究方向为测井地质学。地址:(610500)四川省成都市新都区西南石油大学地球科学与技术学院。Email:793416551@qq.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“川南深层与昭通中浅层海相页岩气规模效益开发关键技术研究”（编号：2020-CX020000）、高等学校学科创新引智计划（111计划）“深层海相页岩气高效开发学科创新引智基地”（编号：D18016）和国家科技重大专项课题“济阳坳陷页岩油勘探开发目标评价”（编号：2017ZX05049-004）联合资助

New method of shale gas evaluation of Wufeng-Longmaxi Formation in Changning area, southern Sichuan Basin

WEN Kang1,2, YAN Jianping1,2,3, ZHONG Guanghai4, JING Cui5, TANG Hongming2, WANG Min6, WANG Jun6, HU Qinhong7, LI Zhipeng6   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;
    4. Research Institute of Shale gas, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China;
    5. Sichuan Changning Natural Gas Development Company Limited, Chengdu 610051, China;
    6. Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying 257015, Shandong, China;
    7. Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, USA
  • Received:2021-05-12 Revised:2021-07-29 Published:2022-01-21

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摘要： 为了准确评价川南长宁地区五峰组—龙马溪组海相页岩气的含气量，将页岩气分成吸附气和游离气单独进行计算再求和，以等温吸附实验数据为基础，提出并构建了基于微孔充填理论和D-A（Du‐bibin-Astakhov）方程相结合的吸附气量评价模型，模型中的可变参数微孔最大吸附量V0、与吸附体系对气体的亲和力有关的常数B、与吸附体系表面非均质性相关的参数t的计算中均考虑了影响吸附气量的关键参数，如地层压力、总有机碳（TOC）含量和孔隙度等；以含气饱和度法为基础，结合吸附态甲烷对孔隙体积的影响，构建了对游离气量进行定量校正的评价模型。结果表明：新建立的吸附气与游离气含量评价模型在研究区页岩含气量评价中具有良好的应用效果，计算的含气量与实测数据相关系数超过0.90。该研究成果为页岩气资源潜力评价和“甜点”预测提供了依据。

关键词: 页岩含气量, 吸附气, 游离气, 等温吸附, 微孔充填理论, D-A方程

Abstract: In order to evaluate the gas content of marine shale of Wufeng-Longmaxi Formation in Changning area,southern Sichuan Basin,the shale gas was divided into adsorbed gas and free gas and then calculated separately. Based on isothermal adsorption experimental data,a new adsorbed gas volume evaluation model was proposed and constructed based on micropore filling theory and D-A(Dubibin-Astakhov) equation. The key parameters affecting the adsorbed gas volume, such as formation pressure,total organic carbon(TOC) content and porosity, were taken into account in the calculation of the variable parameter V0 which is the maximum micropore adsorption capacity,the constant B related to the affinity of the adsorption system for gas,and the parameter t related to the surface heterogeneity of the adsorption system. Based on the gas saturation method and combined with the effect of adsorbed methane on pore volume,an evaluation model for quantitative correction of free gas volume was established. The results show that the newly established evaluation model of adsorbed gas and free gas volume has a good application effect in the evaluation of shale gas content in the study area,and the correlation coefficient between the calculated gas content and measured data is more than 0.90. The research results provide a basis for shale gas resource potential evaluation and sweet spot prediction.

Key words: shale gas content, adsorbed gas, free gas, isothermal adsorption, micropore filling theory, D-A equation

中图分类号: 

  • TE319
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