摘要
中国致密砂岩气资源丰富,勘探开发潜力广阔,但已有的开发实践证明致密砂岩气藏的开发仍然面临巨大挑战,其中气水分布的精细认识是目前的主要挑战之一。为了深入揭示致密砂岩储层在不同成藏环境下的气水分布规律,本文以东胜气田十里加汗气区上古生界气藏下石盒子组1段和2+3段储层为例,在相似准则的基础上,建立宏观物理模拟实验,研究了一口水平井底部位置成藏过程中的不同充注方式、不同充注动力、不同岩心类型条件下的气水分布规律。结果表明:与连续充注相比,幂式充注下储层中的含气饱和度更高,平均比连续充注高7.95%,阶段性的充注方式使得注入气在停住期间可以进行饱和度场再分布,增大波及体积,气水分布类型主要以气水同层或含气水层为主,无边底水;充注动力研究发现,连续充注条件下强充注动力会加剧不均匀充注程度,降低充注气体的波及效率,导致致密储层中上部的大量地层水被封存,而幂式充注条件下强充注动力可以改善不均匀充注程度,改善波及区域的驱替效率,提高储层的含气饱和度;岩心类型实验显示,储层露头岩样由于其更强的非均质性,充注气体在低物性区域会绕行或充注不彻底,断裂带沟通或远离充注位置区域,充注气体未波及,形成不同规模水体。本次物理模拟实验结果与研究区测井解释结果趋于一致,研究结果对该区块不同成藏过程气水分布特征的认识具有参考意义。
China is rich in tight sandstone gas resources and has broad exploration and development potential.However,the existing developmental practices regarding the development of tight sandstone gas reservoirs still faces great challenges,such as detailed understanding of the gas-water distribution is one of the main challenges at present.In order to further reveal the gas-water distribution of tight sandstone reservoirs under different accumulation environments,this paper takes the Upper Paleozoic gas reservoir members 1 and 2+3 of the Hezi Formation as examples,and establishes a macroscopic physical simulation experiment on the basis of similarity criteria.The gas-water distribution of a horizontal well under different injection modes,different injection forces and different core types was studied.The results showed that,compared with continuous injection,the gas saturation in the reservoir under power injection was 7.95%higher on average than that under continuous injection.The phased injection mode enabled the injected gas to redistribute the saturation field during the stopping period and increased the swept volume.The distribution type of gas and water was mainly in the same layer of gas and water or the gas-bearing water layer,with no boundary bottom water.It was found that under the condition of continuous injection,the strong injection force aggravated the uneven injection degree,reduced the sweep efficiency of the inject gas,and led to the sealing of a large amount of formation water in the middle and upper parts of the tight reservoir.Under the power-injection condition,a strong injection power improved the degree of uneven injection,improved the displacement efficiency of the swept area,and increased the gas saturation of the reservoir.A core type test showed that the gas injected in a low physical property area could be diverted or incompletely charged due to the stronger heterogeneity of the outcrop sample.The fault zone communicated or was far away from the injection location,and the injected gas did not
作者
曹桐生
张厅汉
张悦
王璐
CAO Tongsheng;ZHANG Tinghan;ZHANG Yue;WANG Lu(SINOPEC North China Company,Zhengzhou 450006,China;College of Energy,Chengdu University of Technology,Chengdu 610059,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第1期60-75,共16页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(51774053)。
关键词
致密砂岩气藏
成藏环境
相似准则
物理模拟实验
气水分布特征
tight sandstone gas reservoir
reservoir forming environment
similarity criterion
physical simulation experiment
gas-water distribution characteristics
