四川盆地东南部页岩气同位素分馏特征及对产能的指示意义

高玉巧; 高和群; 何希鹏; 丁安徐; 张培先; 何贵松

doi:10.11781/sysydz201906865

四川盆地东南部页岩气同位素分馏特征及对产能的指示意义

doi: 10.11781/sysydz201906865

中国石化华东油气分公司勘探开发研究院, 南京 210011

基金项目:

国家科技重大专项"彭水地区常压页岩气勘探开发示范工程"（2016ZX05061）和中国石化科技部项目"渝东南盆缘转换带页岩气富集主控因素研究"（P18057-2）联合资助。

详细信息

作者简介:
高玉巧(1978-),女,博士,高级工程师,从事页岩气勘探开发及研究。E-mail:gaoyq.hdsj@sinopec.com。

中图分类号: TE122.1
计量
- 文章访问数: 724
- HTML全文浏览量: 80
- PDF下载量: 151
- 被引次数: 0
出版历程
- 收稿日期: 2019-07-01
- 修回日期: 2019-10-18
- 刊出日期: 2019-11-28

Methane isotope fractionation characteristics of shale gas and its significance as a productivity indicator

Research Institute of Petroleum Exploration & Development, East China Branch Company, SINOPEC, Nanjing, Jiangsu 210011, China

摘要

摘要: 页岩气甲烷碳同位素是研究页岩气同位素分馏特征及产出过程的重要指标。选取四川盆地东南部及盆缘转换带内6大区块10口页岩气井上奥陶统五峰组-下志留统龙马溪组页岩，通过现场含气量测试过程中页岩气甲烷碳同位素变化，研究不同压力系统、不同小层下甲烷碳同位素分馏特征，探讨页岩气同位素与物性、含气性关系，并结合实际排采数据，对典型页岩气井产出阶段进行划分。页岩气解吸过程中，逐渐升高，甲烷碳同位素逐渐变重；超压页岩气甲烷碳同位素整体较小，从盆缘外部向内部，甲烷碳同位素逐渐变轻。纵向上，随着深度的增加，甲烷同位素整体变轻；页岩孔隙度越大、游离气含量越高、页岩保存条件越好，甲烷碳同位素分馏作用就越不明显。最后，选取武隆向斜L井岩心现场解吸气样，通过甲烷同位素分馏，对页岩气解吸阶段进行划分，并将排采气同位素与现场解吸气同位素进行比对。该井排采气的δ¹³C₁值对应现场岩心连续解吸0.9 h释放气体的δ¹³C₁值，其采收率约为24.8%，尚处于初期排采阶段。
- 现场含气量测试 /
- 压力系统 /
- 甲烷碳同位素 /
- 同位素分馏 /
- 页岩气 /
- 盆缘转换带 /
- 四川盆地东南部
Abstract: Carbon isotopes of methane in shale gas provide an important index for studying isotope fractionation characteristics and the gas production process. The carbon isotope variation of shale gas during in situ gas content measurement was studied for 10 shale gas wells of Wufeng-Longmaxi formations in 6 large blocks in the southeastern Sichuan Basin and the basin margin transition zone (the basin margin-transition zone of southeastern Chongqing). The fractionation characteristics of methane under different pressure systems and different subformations were studied, and the relationships between the isotopes of shale gas and its physical and gas-bearing properties were discussed. The production stages of typical shale gas wells were divided by drainage data.δ¹³C₁ gradually increased during shale gas desorption, while the carbon isotope of methane in overpressure shale gas was smaller. From the outside of the basin margin to the inside, the carbon isotope of methane gradually became lighter, and in the longitudinal direction, with the increase of depth, the methane isotope becomes lighter. Greater porosity of shale, higher content of free gas and better preservation conditions of shale correlate with less fractionation of carbon isotopes. Finally, the desorption stage of shale gas was divided by methane isotope fractionation, and the isotopes of production gas was compared with that of core desorption gas of well L in the Wulong syncline as an example. The δ¹³C value of gas released corresponded to that of core sample after continuous desorption of 0.9 h, and its recovery rate was about 24.8%, which was still in the initial stage of drainage production.
- in situ gas content measurement /
- pressure system /
- methane isotope /
- isotope fractionation /
- shale gas /
- margin-transition zone /
- southeastern Sichuan Basin

HTML全文

参考文献(25)

[1]	戴金星,秦胜飞,陶士振,等.中国天然气工业发展趋势和天然气地学理论重要进展[J].天然气地球科,2005,16(2):127-142. DAI Jinxing,QIN Shengfei,TAO Shizhen,et al.Developing trends of natural gas industry and the significant progress on natural gas geological theories in China[J].Natural Gas Geoscience,2005,16(2):127-142.
[2]	戴金星,倪云燕,邹才能,等.四川盆地须家河组煤系烷烃气碳同位素特征及气源对比意义[J].石油与天然气地质,2009,30(5):519-529. DAI Jinxing,NI Yunyan,ZOU Caineng,et al.Carbon isotope features of alkane gases in the coal measures of the Xujiahe Formation in the Sichuan Basin and their significance to gas-source correlation[J].Oil & Gas Geology,2009,30(5):519-529.
[3]	戴金星.天然气中烷烃气碳同位素研究的意义[J].天然气工业,2011,31(12):1-6. DAI Jinxing.Significance of the study on carbon isotopes of alkane gases[J].Natural Gas Industry,2011,31(12):1-6.
[4]	范明,俞凌杰,徐二社,等.页岩气保存机制探讨[J].石油实验地质,2018,40(1):126-132. FAN Ming,YU Lingjie,XU Ershe,et al.Preservation mechanism of Fuling shale gas[J].Petroleum Geology & Experiment,2018,40(1):126-132.
[5]	倪春华,刘光祥,朱建辉,等.鄂尔多斯盆地杭锦旗地区上古生界天然气成因及来源[J].石油实验地质,2018,40(2):193-199. NI Chunhua,LIU Guangxiang,ZHU Jianhui,et al.Origin and source of natural gas in the Upper Paleozoic in Hangjinqi area,Ordos Basin[J].Petroleum Geology & Experiment,2018,40(2):193-199.
[6]	董才源,谢增业,裴森奇,等.四川盆地中二叠统天然气地球化学特征及成因判识[J].断块油气田,2018,25(4):450-454. DONG Caiyuan,XIE Zengye,PEI Senqi,et al.Natural gas geoche-mical characteristics and genetic type identification of Middle Permian in Sichuan Basin[J].Fault-Block Oil and Gas Field,2018,25(4):450-454.
[7]	郭潇潇,熊小峰,徐新德,等.莺歌海盆地天然气类型划分与来源分析[J]. 特种油气藏,2017,24(5):54-58. GUO Xiaoxiao,XIONG Xiaofeng,XU Xinde,et al.Type classification and origin analysis of natural gas in the Yinggehai Basin[J].Special Oil & Gas Reservoirs,2017,24(5):54-58.
[8]	陈斐然,姜呈馥,史鹏,等.陆相页岩气组分与碳同位素特征对页岩气产量预测的启示[J].天然气地球科学,2016,27(6):1074-1083. CHEN Feiran,JANG Chengfu,SHI Peng,et al.Gas composition and carbon isotopic fractionation characteristics of terrestrial Ordos shale gas:implications for prediction of shale gas production over time[J].Natural Gas Geoscience,2016,27(6):1074-1083.
[9]	李凯,孟志勇,吉婧,等.四川盆地涪陵地区五峰-龙马溪组解吸气特征及影响因素分析[J].石油实验地质,2018,40(1):90-96. LI Kai,MENG Zhiyong,JI Jing,et al.Characteristics and influencing factors of desorption gas in Wufeng-Longmaxi formations in Fuling area,Sichuan Basin[J].Petroleum Geology & Experiment,2018,40(1):90-96.
[10]	高和群,丁安徐,陈云燕.页岩气解析规律及赋存方式探讨[J].高校地质学报,2017,23(2):285-295. GAO Hequn,DING Anxu,CHEN Yunyan.Discussion on the rules of gas desorption and occurrence mode in shale[J].Geological Journal of China Universities,2017,23(2):285-295.
[11]	李五忠,雍洪,李贵中.煤层气甲烷碳同位素的特征及分馏效应[J].天然气工业,2010,30(11):14-16. LI Wuzhong,YONG Hong,LI Guizhong.Features and fractionation effect of methane isotope in coalbed methane gas[J].Natural Gas Industry,2010,30(11):14-16.
[12]	孟强,王晓锋,王香增,等.页岩气解析过程中烷烃碳同位素组成变化及其地质意义:以鄂尔多斯盆地伊陕斜坡东南部长7页岩为例[J].天然气地球科学,2015,26(2):333-340. MENG Qiang,WANG Xiaofeng,WANG Xiangzeng,et al.Variation of carbon isotopic composition of alkanes during the shale gas desorption process and its geological significance:a case study of Chang 7 shale of Yanchang Formation in Yishan Slope, southeast of Ordos Basin[J].Natural Gas Geoscience,2015,26(2):333-340.
[13]	孟召平,张纪星,刘贺,等.煤层甲烷碳同位素与含气性关系[J].煤炭学报,2014,39(8):1683-1690. MENG Zhaoping,ZHANG Jixing,LIU He,et al.Relationship between the methane carbon isotope and gas-bearing properties of coal reservoir[J].Journal of China Coal Society,2014,39(8):1683-1690.
[14]	王钊,邱军利.鄂尔多斯盆地长8储层碳酸盐胶结物成分组成与碳氧同位素特征研究[J].油气藏评价与开发,2018,8(2):14-21. WANG Zhao,QIU Junli.Study on composition,carbon and oxygen isotopic characteristics of carbonate cements in Chang-8 reservoir,Ordos Basin[J].Reservoir Evaluation and Development,2018,8(2):14-21.
[15]	姜生玲,张金川,李博,等.中国现阶段页岩气资源评价方法分析[J].断块油气田,2017,24(5):642-646. JIANG Shengling,ZHANG Jinchuan,LI Bo,et al.Analysis of shale gas resources assessment method in China[J].Fault-Block Oil and Gas Field,2017,24(5):642-646.
[16]	许心怡,岳长涛,李术元,等.四川志留系龙马溪组页岩等温解吸及甲烷碳同位素分馏特征[J].石油科学通报,2018,3(1):1-10. XU Xinyi,YUE Changtao,LI Shuyuan,et al.Isothermal desorption and methane carbon isotope fractionation of shale gas in the Silurian Longmaxi Formation,Sichuan[J].Petroleum Science Bulletin,2018,3(1):1-10.
[17]	杨振恒,魏志红,何文斌,等.川东南地区五峰组-龙马溪组页岩现场解吸气特征及其意义[J].天然气地球科学,2017,28(1):156-163. YANG Zhenheng,WEI Zhihong,HE Wenbin,et al.Characteristics and significance of on-site gas desorption from Wufeng-Longmaxi shales in southeastern Sichuan Basin[J].Natural Gas Geoscience,2017,28(1):156-163.
[18]	谈玉明,徐田武,张云献,等.东濮凹陷天然气富集规律[J].断块油气田,2017,24(4):442-447. TAN Yuming,XU Tianwu,ZHANG Yunxian,et al.Gas accumulation regularity of Dongpu Depression[J].Fault-Block Oil and Gas Field,2017,24(4):442-447.
[19]	CHEN Zhi, LI Ying, DU Jianguo, et al. Carbon isotope variations in inorganic carbon materials:implications for mud volcanic carbon cycling in the northern Tianshan fold zone, Xinjiang, China[J]. Applied Geochemistry, 2018, 97:32-39.
[20]	方志雄,何希鹏.渝东南武隆向斜常压页岩气形成与演化[J].石油与天然气地质,2016,37(6):819-827. FANG Zhixiong,HE Xipeng.Formation and evolution of normal pressure shale gas reservoir in Wulong Syncline,southeast Chongqing,China[J].Oil & Gas Geology,2016,37(6):819-827.
[21]	何希鹏,高玉巧,唐显春,等.渝东南地区常压页岩气富集主控因素分析[J].天然气地球科学,2017,28(4):654-664. HE Xipeng,GAO Yuqiao,TANG Xianchun,et al.Analysis of major factors controlling the accumulation in normal pressure shale gas in the southeast of Chongqing[J].Natural Gas Geoscience,2017,28(4):654-664.
[22]	何希鹏,何贵松,高玉巧,等.渝东南盆缘转换带常压页岩气地质特征及富集高产规律[J].天然气工业,2018,38(12):1-14. HE Xipeng,HE Guisong,GAO Yuqiao,et al.Geological characteristics and enrichment laws of normal-pressure shale gas in the basin-margin transition zone of SE Chongqing[J].Natural Gas Industry,2018,38(12):1-14.
[23]	马永生,蔡勋育,赵培荣.中国页岩气勘探开发理论认识与实践[J].石油勘探与开发,2018,45(4):561-574. MA Yongsheng,CAI Xunyu,ZHAO Peirong.China's shale gas exploration and development:understanding and practice[J].Petroleum Exploration and Development,2018,45(4):561-574.
[24]	高玉巧,蔡潇,张培先,等.渝东南盆缘转换带五峰组-龙马溪组页岩气储层孔隙特征与演化[J].天然气工业,2018,38(12):15-25. GAO Yuqiao,CAI Xiao,ZHANG Peixian,et al.Pore characteristics and evolution of Wufeng-Longmaxi Fms shale gas reservoirs in the basin-margin transition zone of SE Chongqing[J].Natural Gas Industry,2018,38(12):15-25.
[25]	高和群,曹海虹,曾隽.页岩气解吸规律新认识[J].油气地质与采收率,2019,26(2):81-86. GAO Hequn,CAO Haihong,ZENG Jun.New understanding of shale gas desorption law[J].Petroleum Geology and Recovery Efficiency,2019,26(2):81-86.