摘要
鄂尔多斯盆地东缘致密气区块纵向发育气层多、横向连续性差、产水积液、产能差异大,在静态资料较少情况下,快速有效的评价新区块产能规模难度大。以鄂尔多斯盆地东缘ZJS新区块为例,挑选地质条件类似且已开发生产的邻区,采用不稳定产能法得到单井典型层有效渗透率、经济可采储量等动态参数;结合ZJS区块气层厚度、孔隙度等静态参数以及类比得到的动态参数,建立ZJS典型层单井数值模拟,考虑实际生产水气比对产能的影响,预测ZJS区块单井产能剖面及经济累产;类比邻区各层系采收率,确定ZJS区块经济可采储量,结合数值模拟预测的ZJS区块单井经济累产,确定新区块开发投产井数;最后在单井产能剖面基础上,预测ZJS区块产能规模。结果表明,在动用储量相同情况下,有效渗透率,单井泄气半径、考虑水气比的单井经济累产等动态参数对新区块最终布置井数、产能规模影响大。新区产能规模评价时,充分利用地质条件相似区块分类分层深入类比,可实现新区块快速有效评价,为区块高效开发奠定基础。
The tight gas block in the eastern margin of Ordos basin has many gas layers vertically,but their horizontal continuity is poor.This block produces water and accumulates fluid.In addition,its productivity difference is large,so it is difficult to quickly and effectively evaluate the productivity scale of the new block under the condition of less static data.Taking new block ZJS in the eastern margin of Ordos Basin as an example,the adjacent areas with similar geological conditions and developed production are selected,and the dynamic parameters such as effective permeability and economically recoverable reserves of typical single well layers are obtained by using the unstable productivity method;Combined with static parameters such as gas layer thickness and porosity in ZJS block and dynamic parameters obtained by analogy,the single well numerical simulation of typical layers in ZJS block is established.Considering the influence of actual production water gas ratio on productivity,the single well productivity profile and economic cumulative production in ZJS block are predicted;The economic recoverable reserves of ZJS block are determined by comparing the recovery rates of each layer in the adjacent area.Combined with the economic cumulative production of single well predicted by numerical simulation,the number of wells developed and put into production in the new block is determined;finally,based on single well productivity profile,the productivity scale of ZJS block is predicted.The results show that under the condition of the same production reserves,the effective permeability,single well gas release radius,single well economic cumulative production considering water gas ratio and other dynamic parameters have great influence on the final number of wells and production capacity scale in the new block.When evaluating the production capacity scale of the new area,it should make full use of the classification and deep analogy of blocks with similar geological conditions,so as to realize the rapid and effective ev
作者
宣涛
蔡振华
姜康
刘世界
段宝江
XUAN Tao;CAI Zhenhua;JIANG Kang;LIU Shijie;DUAN Baojiang(Engineering Technology Branch,CNOOC Energy Development Co.,Ltd.,Tianjin 300452,China)
出处
《油气井测试》
2021年第4期67-72,共6页
Well Testing
基金
中海油能源发展股份有限公司工程技术分公司致密砂岩气田产能评价项目“山西紫金山致密砂岩气田产能评价”(SHPC19YZ008)。
关键词
致密气区块
快速评价
可采储量
产能规模
对比分析
动态参数
数值模拟
tight gas block
rapid evaluation
recoverable reserves
capacity scale
comparative analysis
dynamic parameters
numerical simulation
