气藏凝析水引起的地层水矿化度淡化问题——以四川盆地新场气田须二段气藏为例
|
摘要
前人据研究成果提出了高温高压气藏地层水矿化度变化较大的认识,由此有可能得出与实际情况不一致的结论,其主要原因是忽视了低矿化度凝析水的影响。为此,利用四川盆地新场气田须家河组二段气藏投产以来获得的产出水样矿化度资料,研究了不同水气比阶段的井口水样矿化度特征,认为井口产出水样矿化度明显受到了凝析水淡化的影响,气藏井口产出水可以划分为凝析水、地层水及其两者的混合水。研究结果表明:①井口产出水矿化度随气井水气比增大而增高,由低矿化度凝析水向高矿化度地层水转变;②当气井水气比小于0.1 m~3/10~4 m~3时,井口产出水为矿化度小于1 g/L的凝析水;③当水气比为0.1~0.8 m~3/10~4 m~3时,水样矿化度介于凝析水和地层水之间,水样以混合水为主;④气井水气比大于等于0.8 m~3/10~4 m~3时,水样最接近于地层水矿化度,凝析水对水样矿化度的影响可以忽略;⑤在排除凝析水淡化影响后,单一气藏地层水矿化度差异不大,新场气田须二段气藏变化范围在93.47~120.05 g/L之间。
Based on previous data,the formation water salinity of high-temperature and high-pressure gas reservoirs varies in a large range,because the effect of low-salinity condensate water is neglected.In this paper,therefore,the salinity of wellhead water samples was analyzed for different water-gas ratios by using the salinity data of water produced from the gas reservoir of the Second Member of Xujiahe Formation,Xinchang gas field in the Sichuan Basin.It is indicated that the salinity of wellhead water samples is influenced greatly by the desalination of condensate water.The water produced from gas reservoirs is divided into condensate water,formation water and their mixture.It is shown that the produced water changes from low-salinity condensate water to high-salinity formation water because its salinity rises with water-gas ratio of gas wells.When the water-gas ratio is less than 0.1 m~3/10~4 m~3,there is condensate water with salinity lower than 1 g/L at the wellhead.When the water-gas ratio is(0.1- 0.8) m~3/10~4 m~3,mixture is dominant with salinity between condensate water and formation water.When the water-gas ratio is more than 0.8 m~3/10~4 m~3,the sample salinity is mostly controlled by formation water and the effect of condensate water on sample salinity can be ignored.After the effect of condensate water desalination is removed,formation water salinity of single gas reservoir varies little.For the gas reservoir of the Second Member of Xujiahe Formation in the Xinchang Gas Field,it is in the range of 93.47- 120.05 g/L.
Based on previous data,the formation water salinity of high-temperature and high-pressure gas reservoirs varies in a large range,because the effect of low-salinity condensate water is neglected.In this paper,therefore,the salinity of wellhead water samples was analyzed for different water-gas ratios by using the salinity data of water produced from the gas reservoir of the Second Member of Xujiahe Formation,Xinchang gas field in the Sichuan Basin.It is indicated that the salinity of wellhead water samples is influenced greatly by the desalination of condensate water.The water produced from gas reservoirs is divided into condensate water,formation water and their mixture.It is shown that the produced water changes from low-salinity condensate water to high-salinity formation water because its salinity rises with water-gas ratio of gas wells.When the water-gas ratio is less than 0.1 m~3/10~4 m~3,there is condensate water with salinity lower than 1 g/L at the wellhead.When the water-gas ratio is(0.1- 0.8) m~3/10~4 m~3,mixture is dominant with salinity between condensate water and formation water.When the water-gas ratio is more than 0.8 m~3/10~4 m~3,the sample salinity is mostly controlled by formation water and the effect of condensate water on sample salinity can be ignored.After the effect of condensate water desalination is removed,formation water salinity of single gas reservoir varies little.For the gas reservoir of the Second Member of Xujiahe Formation in the Xinchang Gas Field,it is in the range of 93.47- 120.05 g/L.
引文
[1]刘仑.天然气中凝析水和烃类水化物的形成[J].天然气工业,1981,1(4):47-50.Liu Lun.The formation of condensate water and hydrocarbon hydrate in natural gas[J].Natural Gas Industry,1981,1(4):47-50.
[2]庞河清,匡建超,罗桂滨,廖开贵,蔡左花,王众,等.川西新场气田须二段气藏水体动态分布与水化学特征[J].天然气地球科学,2012,23(1):190-197.Pang Heqing,Kuang Jianchao,Luo Guibin,Liao Kaigui,Cai Zuohua,Wang Zhong,et al.Water dynamic distribution and chemical character in Xu2 member gas reservoir of Xinchang Gas Field,western Sichuan Basin[J].Natural Gas Geoscience,2012,23(1):190-197.
[3]赵永胜,周文.川西坳陷须二段气藏凝析水地球化学特征及成因初探[J].天然气地球科学,1995,6(1):30-33.Zhao Yongsheng,Zhou Wen.The geochemical characteristics and genesis of condensate water in Xu2 member gas reservoir,Western Sichuan Depression[J].Natural Gas Geoscience,1995,6(1):30-33.
[4]诸林,范峻铭,诸佳,覃丽,李璐伶.非酸性天然气含水量的公式化计算方法及其适应性分析[J].天然气工业,2014,34(6):117-122.Zhu Lin,Fan Junming,Zhu Jia,Qin Li,Li Luling.Formula calculation methods of water content in sweet natural gas and their adaptability analysis[J].Natural Gas Industry,2014,34(6),117-122.
[5]李晓平,刘启国,孙万里,杨杰,杨川东.气井凝析液量研究[J].钻采工艺,2001,24(6):30-32.Li Xiaoping,Liu Qiguo,Sun Wanli,Yang Jie,Yang Chuandong.Study on condensate liquid for gas well[J].Drilling&Production Technology,2001,24(6):30-32.
[6]刘莉萍,林小兵,李丽平.四川盆地孝泉-丰谷构造带须家河组气藏气水分布控制因素及勘探潜力[J].天然气工业,2013,33(6):16-22.Liu Liping,Lin Xiaobing,Li Liping.Factors controlling gaswater contact and the exploration potential of the Xujiahe Fm gas reservoirs in the Xiaoquan-Fenggu structural zone,Sichuan Basin[J].Natural Gas Industry,2013,33(6):16-22.
[7]汪珊.论川西坳陷上三叠统气田水化学场及其分带[J].地球学报,2003,24(1):67-72.Wang Shan.Hydrochemical field and zonation of the upper triassic gas field water in the West Sichuan Depression[J].Acta Geoscientia Sinica,2003,24(1):67-72.
[8]沈忠民,宫亚军,刘四兵,吕正祥.川西坳陷新场地区上三叠统须家河组地层水成因探讨[J].地质论评,2012,56(1):82-88.Shen Zhongmin,Gong Yajun,Liu Sibing,Lil Zhengxiang.A discussion on genesis of the Upper Triassic Xujiahe Formation water in Xinchang Area,Western Sichuan Depression[J].Geological Review,2012,56(1):82-88.
[9]沈忠民,刘四兵,吕正祥,罗小平,宫亚军.川西坳陷中段陆相地层水纵向变化特征及水-岩相互作用初探[J].沉积学报,2011,29(3):495-502.Shen Zhongmin,Liu Sibing,Lu Zhengxiang,Luo Xiaoping,Gong Yajun.Vertical geochemical characteristics of continental formation water and its Water-Rock interaction in the middle area of Western Sichuan Depression[J].Acta Sedimentologica Sinica,2011,29(3):495-502.
[10]汪泽成,李晓清,赵献文.川西地区上三叠统气田水化学场特征[J].天然气工业,2001,21(5):27-30.Wang Zecheng,Li Xiaoqing,Zhao Xianwen.Gas field hydrochemical characteristics of the upper triassic in west Sichuan[J].Natural Gas Industry,2001,21(5):27-30.
[11]冷济高,杨克明,叶军,朱宏权.孝泉-丰谷构造带须家河组地层水成因分析[J].西南石油大学学报:自然科学版,2011,33(1):57-63.Leng Jigao,Yang Keming,Ye Jun,Zhu Hongquan.The origin analysis of stratum water in Xujiahe Formation of Xiaoquan-Fenggu structural belt[J].Journal of Southwest Petroleum University:Science&Technology Edition,2011,33(1)..57-63.
[12]刘四兵,沈忠民,刘吴年,吕正祥,王鹏.川西坳陷中段上三叠统须家河组水岩相互作用机制[J].石油学报,2013,34(1):47-58.Liu Sibing,Shen Zhongmin,Liu Haonian,Lu Zhengxiang,Wang Peng.Mechanism of water-rock interaction of the upper Triassic Xujiahe Formation in the middle part of Western Sichuan Depression[J].Acta Petrolei Sinica,2013,34(1):47-58.
[13]宫亚军,沈忠民,刘四兵,吕正祥.川西坳陷新场地区须家河组地层水的地化特征研究[J].四川地质学报,2010,30(1):72-74.Gong Yajun,Shen Zhongmin,Liu Sibing,Lu Zhengxiang.Geochemical characteristics of formation water in the Xujiahe Formation in the Xinchang area,West Sichuan Depression[J].Acta Geologica Sichuan,2010,30(1),72-74.
[14]吴浩,郑丽,慈建发.新场气田须二段地层水地球化学特征及其石油地质意义[J].天然气勘探与开发,2012,35(4):41-44.Wu Hao,Zheng Li,Ci Jianfa.Geochemical characteristic of formation water in Xujiahe 2 member,Xinchang Gas Field[J].Natural Gas Exploration and Development,2012,35(4),41-44.
[15]刘树根,孙玮,赵异华,王国芝,宋林珂,邓宾,等.四川盆地震旦系灯影组天然气的差异聚集分布及其主控因素[J].天然气工业,2015,35(1):10-23.Liu Shugen,Sun Wei,Zhao Yihua,Wang Guozhi,Song Linke,Deng Bin,et al.Differential accumulation and distribution of natural gas and their main controlling factors in the Upper Sinian Dengying Fm,Sichuan Basin[J].Natural Gas Industry,2015,35(1),10-23.
[16]熊亮,康保平,史洪亮,江伟,汪娟.川西大邑气藏气田水化学特征及其动态运移[J].西南石油大学学报:自然科学版,2011,33(5):84-88.Xiong Liang,Kang Baoping,Shi Hongliang,Jiang Wei,Wang Juaa The chemical characteristics and its dynamic transportation of gas field water of Dayi gas reservoir of western Sichuan[J].Journal of Southwest Petroleum University,Science&Technology Edition,2011,33(5),84-88.
[2]庞河清,匡建超,罗桂滨,廖开贵,蔡左花,王众,等.川西新场气田须二段气藏水体动态分布与水化学特征[J].天然气地球科学,2012,23(1):190-197.Pang Heqing,Kuang Jianchao,Luo Guibin,Liao Kaigui,Cai Zuohua,Wang Zhong,et al.Water dynamic distribution and chemical character in Xu2 member gas reservoir of Xinchang Gas Field,western Sichuan Basin[J].Natural Gas Geoscience,2012,23(1):190-197.
[3]赵永胜,周文.川西坳陷须二段气藏凝析水地球化学特征及成因初探[J].天然气地球科学,1995,6(1):30-33.Zhao Yongsheng,Zhou Wen.The geochemical characteristics and genesis of condensate water in Xu2 member gas reservoir,Western Sichuan Depression[J].Natural Gas Geoscience,1995,6(1):30-33.
[4]诸林,范峻铭,诸佳,覃丽,李璐伶.非酸性天然气含水量的公式化计算方法及其适应性分析[J].天然气工业,2014,34(6):117-122.Zhu Lin,Fan Junming,Zhu Jia,Qin Li,Li Luling.Formula calculation methods of water content in sweet natural gas and their adaptability analysis[J].Natural Gas Industry,2014,34(6),117-122.
[5]李晓平,刘启国,孙万里,杨杰,杨川东.气井凝析液量研究[J].钻采工艺,2001,24(6):30-32.Li Xiaoping,Liu Qiguo,Sun Wanli,Yang Jie,Yang Chuandong.Study on condensate liquid for gas well[J].Drilling&Production Technology,2001,24(6):30-32.
[6]刘莉萍,林小兵,李丽平.四川盆地孝泉-丰谷构造带须家河组气藏气水分布控制因素及勘探潜力[J].天然气工业,2013,33(6):16-22.Liu Liping,Lin Xiaobing,Li Liping.Factors controlling gaswater contact and the exploration potential of the Xujiahe Fm gas reservoirs in the Xiaoquan-Fenggu structural zone,Sichuan Basin[J].Natural Gas Industry,2013,33(6):16-22.
[7]汪珊.论川西坳陷上三叠统气田水化学场及其分带[J].地球学报,2003,24(1):67-72.Wang Shan.Hydrochemical field and zonation of the upper triassic gas field water in the West Sichuan Depression[J].Acta Geoscientia Sinica,2003,24(1):67-72.
[8]沈忠民,宫亚军,刘四兵,吕正祥.川西坳陷新场地区上三叠统须家河组地层水成因探讨[J].地质论评,2012,56(1):82-88.Shen Zhongmin,Gong Yajun,Liu Sibing,Lil Zhengxiang.A discussion on genesis of the Upper Triassic Xujiahe Formation water in Xinchang Area,Western Sichuan Depression[J].Geological Review,2012,56(1):82-88.
[9]沈忠民,刘四兵,吕正祥,罗小平,宫亚军.川西坳陷中段陆相地层水纵向变化特征及水-岩相互作用初探[J].沉积学报,2011,29(3):495-502.Shen Zhongmin,Liu Sibing,Lu Zhengxiang,Luo Xiaoping,Gong Yajun.Vertical geochemical characteristics of continental formation water and its Water-Rock interaction in the middle area of Western Sichuan Depression[J].Acta Sedimentologica Sinica,2011,29(3):495-502.
[10]汪泽成,李晓清,赵献文.川西地区上三叠统气田水化学场特征[J].天然气工业,2001,21(5):27-30.Wang Zecheng,Li Xiaoqing,Zhao Xianwen.Gas field hydrochemical characteristics of the upper triassic in west Sichuan[J].Natural Gas Industry,2001,21(5):27-30.
[11]冷济高,杨克明,叶军,朱宏权.孝泉-丰谷构造带须家河组地层水成因分析[J].西南石油大学学报:自然科学版,2011,33(1):57-63.Leng Jigao,Yang Keming,Ye Jun,Zhu Hongquan.The origin analysis of stratum water in Xujiahe Formation of Xiaoquan-Fenggu structural belt[J].Journal of Southwest Petroleum University:Science&Technology Edition,2011,33(1)..57-63.
[12]刘四兵,沈忠民,刘吴年,吕正祥,王鹏.川西坳陷中段上三叠统须家河组水岩相互作用机制[J].石油学报,2013,34(1):47-58.Liu Sibing,Shen Zhongmin,Liu Haonian,Lu Zhengxiang,Wang Peng.Mechanism of water-rock interaction of the upper Triassic Xujiahe Formation in the middle part of Western Sichuan Depression[J].Acta Petrolei Sinica,2013,34(1):47-58.
[13]宫亚军,沈忠民,刘四兵,吕正祥.川西坳陷新场地区须家河组地层水的地化特征研究[J].四川地质学报,2010,30(1):72-74.Gong Yajun,Shen Zhongmin,Liu Sibing,Lu Zhengxiang.Geochemical characteristics of formation water in the Xujiahe Formation in the Xinchang area,West Sichuan Depression[J].Acta Geologica Sichuan,2010,30(1),72-74.
[14]吴浩,郑丽,慈建发.新场气田须二段地层水地球化学特征及其石油地质意义[J].天然气勘探与开发,2012,35(4):41-44.Wu Hao,Zheng Li,Ci Jianfa.Geochemical characteristic of formation water in Xujiahe 2 member,Xinchang Gas Field[J].Natural Gas Exploration and Development,2012,35(4),41-44.
[15]刘树根,孙玮,赵异华,王国芝,宋林珂,邓宾,等.四川盆地震旦系灯影组天然气的差异聚集分布及其主控因素[J].天然气工业,2015,35(1):10-23.Liu Shugen,Sun Wei,Zhao Yihua,Wang Guozhi,Song Linke,Deng Bin,et al.Differential accumulation and distribution of natural gas and their main controlling factors in the Upper Sinian Dengying Fm,Sichuan Basin[J].Natural Gas Industry,2015,35(1),10-23.
[16]熊亮,康保平,史洪亮,江伟,汪娟.川西大邑气藏气田水化学特征及其动态运移[J].西南石油大学学报:自然科学版,2011,33(5):84-88.Xiong Liang,Kang Baoping,Shi Hongliang,Jiang Wei,Wang Juaa The chemical characteristics and its dynamic transportation of gas field water of Dayi gas reservoir of western Sichuan[J].Journal of Southwest Petroleum University,Science&Technology Edition,2011,33(5),84-88.
目录