量化指标在煤层气开发潜力定量评价中的应用

doi:10.7623/syxb201706007

石油学报 ›› 2017, Vol. 38 ›› Issue (6): 677-686.DOI: 10.7623/syxb201706007

量化指标在煤层气开发潜力定量评价中的应用

康永尚^1,2, 王金¹, 姜杉钰¹, 张兵^3,4, 毛得雷^5,6, 顾娇杨^3,4

1. 中国石油大学地球科学学院北京 102249;
2. 油气资源与探测国家重点实验室北京 102249;
3. 中海石油(中国)有限公司非常规油气分公司北京 100011;
4. 中联煤层气有限责任公司北京 100011;
5. 煤层气开发利用国家工程研究中心北京 100095;
6. 中联煤层气国家工程研究中心有限责任公司北京 100095

收稿日期:2016-10-16 修回日期:2017-04-25 出版日期:2017-06-25 发布日期:2017-07-08
通讯作者: 康永尚,男,1964年11月生,1984年获中国矿业学院学士学位,1991年获法国洛林理工学院博士学位,现为中国石油大学(北京)教授,主要从事非常规油气勘探开发地质工程及海外油气项目储量、价值评估研究和教学工作。Email:kangysh@sina.com
作者简介:康永尚,男,1964年11月生,1984年获中国矿业学院学士学位,1991年获法国洛林理工学院博士学位,现为中国石油大学(北京)教授,主要从事非常规油气勘探开发地质工程及海外油气项目储量、价值评估研究和教学工作。Email:kangysh@sina.com
基金资助:
国家重大科技专项“滇东黔西煤层气开发技术及先导性试验”（2016ZX05044）资助。

Application of quantitative indexes in quantitative evaluation of coalbed methane development potential

Kang Yongshang^1,2, Wang Jin¹, Jiang Shanyu¹, Zhang Bing^3,4, Mao Delei^5,6, Gu Jiaoyang^3,4

1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
3. Unconventional Oil & Gas Branch, CNOOC China Limited, Beijing 100011, China;
4. China United Coalbed Methane Corporation Ltd., Beijing 100011, China;
5. National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing 100095, China;
6. National Engineering Research Center of China United Coalbed Methane, Beijing 100095, China

Received:2016-10-16 Revised:2017-04-25 Online:2017-06-25 Published:2017-07-08

摘要/Abstract

摘要：

等温吸附曲线蕴藏了丰富的煤储层信息，对于认识煤层气开发潜力至关重要。为了更好地挖掘等温吸附曲线蕴含的丰富信息，定量评价煤层气开发潜力，首先对不同盆地/地区煤岩等温吸附曲线进行了对比分析，探讨了含气饱和度和临储比比值指标的意义和局限性，在此基础上，提出临储压差、临废压差和有效解吸量3个量化指标，并结合具体实例对其应用效果进行分析和论述。研究表明，含气饱和度和临储比是比值指标，可以用来对比评价不同区块、不同煤层、不同井之间开发潜力的优劣和定性评价煤层气开发潜力；相比而言，临储压差、临废压差和有效解吸量可应用于区块和单井不同层次煤层开发潜力定量评价中，能够更好地反映煤层气开发潜力。实例分析表明，寿阳区块15号煤储层有一定的开发潜力，但因其煤岩吸附时间长（扩散速度低），需在见气后通过较长时间的缓慢排采，实现产气潜力的释放；恩洪EH-C6井需要较长时间的前期排水降压过程，但其开发潜力比较乐观。

关键词: 煤层气, 开发潜力评价, 等温吸附, 量化指标, 临储压差, 临废压差, 有效解吸量

Abstract:

The isothermal adsorption curve containing abundant coal reservoir information is vital to recognize coalbed methane development potential. To deeply explore the rich information from isothermal adsorption curve and quantitatively evaluate the coalbed methane development potential, this study first performs a comparative analysis on the isothermal adsorption curves of coals in different basins or regions, and then discusses the significance and limitation of both gas saturation and the ratio of desorption pressure/reservoir pressure. On this basis, three quantitative indexes are proposed, i.e., desorption-formation pressure difference, desorption-abandonment pressure difference and effective desorption quantity, and their application effects were analyzed and discussed using concrete examples. Research shows that the gas saturation and the ratio of desorption pressure/reservoir pressure are relative indexes, which can be used to comparatively evaluate the development potential between different blocks, different coal seams and different wells and qualitatively evaluate CBM development potential. In contrast, the desorption-formation pressure difference, desorption-abandonment pressure difference and effective desorption quantity can be applied to quantitatively evaluate the CBM development potential of CBM blocks and/or single wells, thus better reflecting the CBM development potential. The case analysis shows that coalbed No.15 in Shouyang CBM block has certain development potential, but needs a long period of drainage before and after initial gas production to release the gas development potential due to its long sorption time. Well EH-C6 also has great development potential even if a long-term drainage and relief process is required in advance.

Key words: coalbed methane, evaluation of development potential, isothermal adsorption, quantitative index, desorption-formation pressure difference, desorption-formation pressure difference, effective desorption quantity

中图分类号:

TE37

康永尚, 王金, 姜杉钰, 张兵, 毛得雷, 顾娇杨. 量化指标在煤层气开发潜力定量评价中的应用[J]. 石油学报, 2017, 38(6): 677-686.

Kang Yongshang, Wang Jin, Jiang Shanyu, Zhang Bing, Mao Delei, Gu Jiaoyang. Application of quantitative indexes in quantitative evaluation of coalbed methane development potential[J]. Acta Petrolei Sinica, 2017, 38(6): 677-686.

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量化指标在煤层气开发潜力定量评价中的应用

Application of quantitative indexes in quantitative evaluation of coalbed methane development potential

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