深层碳酸盐岩有水气藏储层孔洞、裂缝发育,岩石压缩性强,气水关系复杂,影响气藏驱动能量变化,进而导致气藏动态分析和开发方式优化差异较大。针对该问题,以安岳气田磨溪区块龙王庙气藏为例,通过实验研究深层碳酸盐岩压缩系数变化规律,建立不同类型储层的压缩系数应力敏感方程。并结合水驱气藏物质平衡方程,通过压降指示曲线来研究不同类型储层压缩系数对变容封闭气藏驱动能量变化的影响、封存水区和气水过渡带不同含水饱和度对变容气藏驱动能量变化的影响、压缩性对水驱气藏驱动能量的影响。计算009-3-X2井不同时期的驱动指数并分析其变化规律。研究结果表明:碳酸盐岩不同类型储层压缩系数差异大,缝洞型储层压缩系数应力敏感性强,开发初期岩石和孔隙水的弹性能量强,弹性驱动指数为0.317~0.535,弹性能量主要在采出程度低于20%时释放;当储层含水饱和度达60%时,地层内自由水的弹性驱动指数达0.359;当存在边底水时,边底水压驱动能量在初期较强,后期逐步减弱。研究成果可为碳酸盐岩气藏开发方式优化、产能评价和储量计算提供重要依据。
Deep aqueous carbonate gas reservoirs are developed with pores and fractures. The strong compressibility of rocks and the complex gas-water relationship affect the variation of driving energy in the gas reservoirs, leading to the great difference in dynamic analysis and development mode optimization of gas reservoirs. In response to this problem, taking the Longwangmiao gas reservoir in the Moxi block of the Anyue Gasfield as an example, the variation rules of the compressibility of deep carbonate rocks were studied through experiments, and the equations were established for the compressibility sensitivity to stress of different types of reservoirs. Combined with the material balance equation of water drive gas reservoirs, the pressure drop indicator curve was employed to study the influence of the compressibility of different types of reservoir on the driving energy variation of variable-volume confined gas reservoirs, and the influence of different water saturations of the connate water area and gas-water transition zone on the driving energy variation of variable-volume confined gas reservoirs, and the influence of compressibility on the driving energy of water drive gas reservoirs. Taking Well 009-3-X2 as an example, the driving indicator in different periods was calculated and its variation rules were analyzed. The results of the study showed that there was quite difference in the compressibility of different types of carbonate reservoirs, the compressibility of fracture-cavity reservoirs was sensitive to stress, the elastic energy of rocks and pore water wars strong in the early stage of development, the elastic driving indicator was 0.317 to 0.535, and the elastic energy was mainly released when the recovery percent was less than 20%; when the water saturation of the reservoir reached 60%, the elastic driving indicator of free water in the formation reached 0.359; when there was edge-bottom water, the driving energy of the edge-bottom water pressure was higher in the initial stage, and gradually weakened later. The study results provide significant basis for the optimization of carbonate gas reservoir development modes, productivity evaluation and reserves calculation.
[1] 胡勇,彭先,李骞,等.四川盆地深层海相碳酸盐岩气藏开发技术进展与发展方向[J].天然气工业,2019,39(9):48-57.
HU Yong,PENG Xian,LI Qian,et al.Progress and development direction of technologies for deep marine carbonate gas reservoirs in the Sichuan Basin[J].Natural Gas Industry,2019,39(9):48-57.
[2] 王璐,杨胜来,彭先,等.缝洞型碳酸盐岩气藏多类型储层内水的赋存特征可视化实验[J].石油学报,2018,39(6):686-696.
WANG Lu,YANG Shenglai,PENG Xian,et al.Visual experiments on the occurrence characteristics of multi-type reservoir water in fracture-cavity carbonate gas reservoir[J].Acta Petrolei Sinica,2018,39(6):686-696.
[3] 孙波,涂国川,王鹏,等.大型深层碳酸盐岩气藏描述技术研究[J].天然气与石油,2017,35(5):66-71.
SUN Bo,TU Guochuan,WANG Peng,et al.Study on description technology in large and deep carbonate gas reservoir[J].Natural Gas and Oil,2017,35(5):66-71.
[4] 王璐,杨胜来,刘义成,等.缝洞型碳酸盐岩气藏多层合采供气能力实验[J].石油勘探与开发,2017,44(5):779-787.
WANG Lu,YANG Shenglai,LIU Yicheng,et al.Experiments on gas supply capability of commingled production in a fracture-cavity carbonate gas reservoir[J].Petroleum Exploration and Development,2017,44(5):779-787.
[5] 成友友,穆龙新,朱恩永,等.碳酸盐岩气藏气井出水机理分析——以土库曼斯坦阿姆河右岸气田为例[J].石油勘探与开发,2017,44(1):89-96.
CHENG Youyou,MU Longxin,ZHU Enyong,et al.Water producing mechanisms of carbonate reservoirs gas wells: a case study of the right bank field of Amu Darya, Turkmenistan[J].Petroleum Exploration and Development,2017,44( 1): 89-96.
[6] 唐川,赵家辉,张俊松,等.考虑水封气的水驱气藏动态储量计算新方法[J].天然气与石油,2013,31(1):63-65.
TANG Chuan,ZHAO Jiahui,ZHANG Junsong,et al.New method for calculation of dynamic reserves in water drive gas reservoir by considering water-sealed gas[J].Natural Gas and Oil,2013,31(1):63-65.
[7] 孙贺东,王宏宇,朱松柏,等.基于幂函数形式物质平衡方法的高压、超高压气藏储量评价[J].天然气工业,2019,39(3):56-64.
SUN Hedong,WANG Hongyu,ZHU Songbai,et al.eserve evaluation of high pressure and ultra high pressure reservoirs with power function material balance method[J].Natural Gas Industry,2019,39(3):56-64.
[8] 郑荣臣,魏俊之.异常高压气藏岩石压缩系数对开采特征的影响[J].大庆石油地质与开发,2002,21(4):41-42.
ZHENG Rongchen,WEI Junzhi.Effect of the compressibility of abnormally high pressured gas reservoir on production characteristic[J].Petroleum Geology & Oilfield Development in Daqing,2002,21(4):41-42.
[9] 朱玉新,谢兴礼,罗凯,等.克拉2异常高压气田开采特征影响因素分析[J].石油勘探与开发,2001,28(5):60-63.
ZHU Yuxin,XIE Xingli,LUO Kai,et al.Analysis of factors influencing production characteristics of Kela 2 overpressured gas field[J].Petroleum Exploration and Development,2001,28(5):60-63.
[10] 田虓丰.考虑岩石压缩系数应力敏感的能量补充时间[J].断块油气田,2019,26(2):192-194.
TIAN Xiaofeng.Energy replenishment time considering rock compressibility stress sensitivity[J].Fault-Block Oil & Gas Field,2019,26(2):192-194.
[11] 李子丰,郑义清.油气藏多孔岩石鼓胀压缩特性表征方法探讨[J].石油钻探技术,2018,46(3):1-6.
LI Zifeng,ZHENG Yiqing.Discussion on a new methods for the characterization of the swelling and compression in porous rocks in oil and gas reservoirs[J].Petroleum Drilling Technology,2018,46(3):1-6.
[12] 高有瑞,刘艳,时付更.基质型灰岩储层岩石压缩系数的确定[J].中国海上油气,2011,23(4):247-251.
GAO Yourui,LIU Yan,SHI Fugeng.Determining rock compressibility for matrix limestone reservoir[J].China Offshore Oil and Gas,2011,23(4):247-251.
[13] 李传亮.岩石压缩系数与孔隙度的关系[J].中国海上油气:地质,2003,17(5):65-68.
LI Chuanliang.The relationship between rock compressibility and porosity[J].China Offshore Oil and Gas: Geology,2003,17(5):65-68.
辽公网安备 21110002000031号 辽ICP备18011648号-1
