井控页岩气可动地质储量和可采储量的评价方法
作者:
作者单位:

作者简介:

陈元千(1933—),男,河南兰考人,教授级高级工程师,从事油气藏工程、油气田开发和油气储量评价工作。联系电话:15910321810,E-mail:fulibing@petrochina.com.cn。

通讯作者:

基金项目:


Methods for estimating well-controlled movable in-place and recoverable reserves of shale gas
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    页岩气是一种非常规天然气资源。页岩气藏由超致密基质和天然裂缝系统组成。基质中的页岩气是自生、自储和自闭的吸附气,裂缝系统中的页岩气为自由气,其中吸附气为页岩气的主体部分,必须通过打水平井进行多段压裂,才能从压裂产生的裂缝面解吸出来。这种被水平井控制的解吸气和自由气量总称为井控页岩气资源量。评价页岩气藏基质中的吸附气资源量和裂缝系统中自由气的资源量,通常采用体积法。其有效应用受基质中原始吸附气含量、天然裂缝系统的有效孔隙度、页岩视密度和原始地层压力准确性的影响。应当指出,中国于2014年颁布的《页岩气资源/储量计算评价技术规范》中所规定的体积法公式是错误的,而且也缺少动态法应用的具体内容。为此,根据页岩气以井为开发单元的特点,提出利用动态法评价井控页岩气可动地质储量和可采储量的方法。3口页岩水平气井实际应用结果表明,新建方法是实用且有效的。

    Abstract:

    Shale gas is one of the unconventional natural gas resources,and shale gas reservoir is composed of extra-dense matrix and natural fracture system. Shale gas in the matrix is adsorbed gas that is self-generated,self-stored and selftraped,while that in the fracture system is free gas. Overall adsorbed gas is the main resource of shale gas,which will be desorbed at the fracture surface created by multistage fracturing in the horizontal well. The desorbed gas and free gas controlled by the horizontal wells are generally called well-controlled movable gas in-place and recoverable reserves. Volumetric method is the most common one for estimating resources of adsorbed gas in the matrix and free gas in the fracture systems in the shale gas reservoirs. However,the application of the volumetric method is greatly influenced by the validity of data including original adsorbed gas content,effective porosity in the fracture system,shale bulk density,and initial formation pressure. It should be noted that the volumetric method formula is uncorrected which was reported in the 2014 national technical standards for shale gas resources/reserves estimation. Moreover,the standards do not refer to any specific content about performance estimating methods. Therefore,considering shale gas is developed in well unit,performance method was presented as to estimate the well-controlled movable in-place and recoverable reserves of shale gas wells. The results of actual application in 3 shale horizontal gas wells indicates that the new method is practical and effective.

    参考文献
    相似文献
    引证文献
引用本文

陈元千,齐亚东,傅礼兵,位云生.井控页岩气可动地质储量和可采储量的评价方法[J].油气地质与采收率,2018,25(4):73~78

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2018-06-04