油气藏评价与开发 ›› 2020, Vol. 10 ›› Issue (4): 53-58.doi: 10.13809/j.cnki.cn32-1825/te.2020.04.008

• 方法理论 • 上一篇    下一篇

延川南煤层气田动态特征和SEC动态储量评估方法研究

周亚彤1,2()   

  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

摘要:

煤层气的SEC储量评估难点是:①煤层气的产量变化有其不同于常规油气的特点;②不同煤阶煤层气的开发规律存在差异。研究表明:深层高阶煤层气与浅层低阶煤层气在评估参数上差异很大。粉河盆地浅层低阶煤层气在评估参数上表现出上产快、峰值产量高和递减大的特点,而延川南深层、高阶煤层气则表现为排水达产时间较长、峰值产量较低和递减小的特点。总结出“三段式”产量预测模式的3种类型和4个亚类。对于I类,采取完整三段式预测,上产时间为28个月,稳产气产量850 m 3/d,稳产期一年,递减率25 %。对于IIa亚类,产量已超过封顶产量,目前产量稳定,采取两段式预测,稳产期半年,递减率25 %;对于IIb亚类,排采时间长,目前产量稳定,虽未达到封顶产量,采取两段式预测,稳产期半年,递减率25 %。对于IIIa亚类,产量已超过封顶产量,目前产量在下降,采取一段式预测,递减率25 %;对于IIIb亚类,整体上产量在上升,但在评估基准日前产量出现下降,采取一段式预测,递减率25 %。利用该方法和评估参数进行的自评估结果与外方评估结果误差在±10 %,证明该方法和评估参数适用于延川南深层、高阶煤层气SEC储量评估。

关键词: 煤层气开发, 动态评估, SEC储量, 延川南煤层气田, 粉河盆地

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.

Key words: CBM development, dynamic assessment, SEC reserves, Yanchuannan coalbed methane field, Powder River Basin

中图分类号: 

  • TE132.2