• 方法理论 •

延川南煤层气田动态特征和SEC动态储量评估方法研究

1. 1.中国石化华东油气分公司勘探开发研究院,江苏 南京 210019
2.中国石化国际石油勘探开发有限公司,北京 100029
• 收稿日期:2020-02-20 出版日期:2020-08-26 发布日期:2020-08-07
• 作者简介:周亚彤（1983 —）,男,硕士,工程师,主要从事油气地质与储量研究工作。通讯地址：北京市朝阳区惠新东街甲6号,邮政编码：100029。E-mail: t-ytzhou.sipc@sinopec.com
• 基金资助:
中国石化科技部项目“延川南深层煤层气稳产技术研究”(P19019-4)

Dynamic characteristics and SEC dynamic reserve assessment of CBM gas field in South Yanchuan

ZHOU Yatong1,2()

1. 1. Exploration and Development Research Institute, Sinopec East China Oil and Gas Company, Nanjing, Jiangsu 210019, China
2. Sinopec International Petroleum Exploration and Production, Beijing 100029, China
• Received:2020-02-20 Online:2020-08-26 Published:2020-08-07

Abstract:

The difficulty of SEC reserve assessment of CBM is: ①the yield change of CBM is different from conventional oil and gas; ②there are differences in the development rules of CBM with different coal ranks. The research shows that deep high-rank and shallow low-rank CBM vary greatly in the evaluation parameters: the shallow low-rank CBM in the Powder River Basin shows the characteristics of quickly entering of high yield period, high peak yield and large production decline, while the high-rank coal seam gas in the deep parts of South Yanchuan are characterized by longer drainage time, low peak yield and low decline. The three types and four sub-classes of the “three-segment” yield forecasting model are summarized. For type I, a complete three-stage forecast is adopted. The yield time is 28 months, the stable production output is 850 m 3/d with the cycle for one year, and the decline rate is 25 %. For the IIa subcategory whose production has exceeded the capped production and is stable at present, or the IIb sub-class whose discharge time is long and the current production of which is stable, although the production hasn’t reached the capped production, two-stage forecast is adopted, the stable production period is half a year, and the decline rate is 25 %. For the IIIa subcategory whose production has exceeded the capped production and the production is declining at present, or the IIIb sub-category whose overall production is on the rise but goes down before the base date of assets evaluation, single-stage forecast is adopted, and the decline rate is 25 %. The error between the self-assessment result and the external assessment result by using this method and the assessment parameters is ±10 %, which proves that this method and the assessment parameters are suitable for the SEC reserve assessment of deep and high-order coalbed methane in south Yanchuan.

• TE132.2