盐水层CO_(2)溶解埋存潜力确定方法  

Method for determining potential of dissolved CO_(2) storage in brine layers

作　　者：李宗阳 张庆福 张团 崔传智[2] LI Zongyang;ZHANG Qingfu;ZHANG Tuan;CUI Chuanzhi(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Key Laboratory of Unconventional Oil and Gas Development,Ministry of Education,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]中国石油大学(华东)非常规油气开发教育部重点实验室,山东青岛266580

出　　处：《油气地质与采收率》2023年第2期174-180,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家重点研发计划“区域二氧化碳捕集与封存关键技术研发与示范”(2022YFE0206800)。

摘　　要：盐水层CO_(2)埋存是一种较为普遍的缓解温室效应的对策之一,而溶解埋存是埋存过程中较为稳定的埋存方式,因此亟需建立一种准确计算溶解埋存潜力的方法。首先利用DUAN等提出的模型计算CO_(2)在水中的溶解系数,进而求得理论溶解埋存量;然后建立有效埋存系数表征指标,并考虑溶解埋存的主控因素,基于数值模拟与回归分析的方法,建立溶解埋存有效埋存系数的预测模型。研究发现:当水平渗透率和地层倾角一定时,溶解埋存有效埋存系数随着初始压力的增大而增大;当初始压力一定时,溶解埋存有效埋存系数随着水平渗透率的增大而增大,随着地层倾角的增大而减小。预测模型预测结果与数值模拟计算结果吻合程度较高。利用孤东油田七区实际参数计算得到理论溶解埋存量为65.382 Mt,溶解埋存有效埋存系数为0.079,溶解埋存有效埋存量为5.178 Mt。CO_(2) storage in the brine layers is one of the common countermeasures to alleviate the greenhouse effect,and dissolved CO_(2) storage is a relatively stable storage mode in the process of storage,so it is urgent to find a method to accurately calculate the potential of dissolved CO_(2) storage.In this paper,the CO_(2) dissolution coefficient in water is calculated by using the prediction model proposed by Duan et al.,and then the theoretical dissolved CO_(2) storage is obtained.Then,the index of the effective CO_(2) storage coefficient is established,and the main controlling factors of dissolved CO_(2) storage are considered.According to the numerical simulation and regression analysis,the prediction model of the effective storage coefficient of dissolved CO_(2) storage is established.The results show that when the horizontal permeability and the formation dip angle are constant,the effective storage coefficient of dissolved CO_(2) storage increases with the increase in initial pressure.When the initial pressure is constant,the effective storage coefficient of dissolved CO_(2) storage increases with the increase in horizontal permeability and decreases with the increase in formation dip angle.The predicted results of the prediction model are in good agreement with the results of the numerical simulation.According to the actual parameters of Block7 in Gudong Oilfield,the theoretical storage is 65.382 Mt,the effective storage coefficient of dissolved CO_(2) storage is 0.079,and the effective storage of dissolved CO_(2) storage is 5.178 Mt.

关 键 词：盐水层 CO_(2)溶解埋存 数值模拟 正交试验 有效埋存系数 回归分析 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]