贵州正安地区五峰组—龙马溪组页岩气组分及含气性特征
Shale gas composition and gas bearing characteristics of Wufeng-Longmaxi For-mation in Zheng'an area,Guizhou Province
吴松 1冯冰 2于继良 3蓝宝锋 4王胜 2李刚权2
作者信息
- 1. 贵州乌江能源投资有限公司,贵州 贵阳 550081
- 2. 贵州页岩气勘探开发有限责任公司,贵州 遵义 563000
- 3. 贵州能源集团有限公司,贵州 贵阳 550081
- 4. 贵州能源产业研究院有限公司,贵州 贵阳 550025
- 折叠
摘要
选取贵州正安地区安场向斜7 口五峰组-龙马溪组页岩气取心井为研究对象,根据现场解析及页岩气样品组分分析,以期了解正安地区五峰组-龙马溪组页岩气组分特征及含气性特征.结果表明:五峰组-龙马溪组页岩气组分中以甲烷为主,含量98.25%～98.36%,平均98.33%,氦气含量为0.06%～0.07%,达到了含氦气田标准;总含气量1.64～5.88 m3/t,平均3.02 m3/t,含气性总体表现出从向斜中部向南北两端逐渐减少,从向斜核部向两翼逐渐降低的趋势.随着深度的增加总含气量不断增加,并在龙马溪组底部达到最大;解吸气量约占总含气量的31.3%～66.7%,损失气量占比为32.5%～66.0%.游吸比为1.39～5.49,平均2.20,整体较高,位于向斜核部的Ay1、Ay4 井的游吸比最高,具有较好的保存条件及可开采能力;含气饱和度整体较高,为58.85%～86.18%,平均75.60%,具有良好的资源前景.
Abstract
Seven shale gas core wells in Wufeng-Longmaxi Formation in Anchang syncline in Zheng'an area of Guizhou Province are selected as the research objects.Through field analysis and composition analysis of shale gas samples,the composition characteristics and gas-bearing characteristics of shale gas in Zheng'an area are expected to be understood.The results show that methane is the main component of shale gas in Wufeng-Longmaxi Forma-tion,with an average content of 98.33%.The helium content is between 0.06%and 0.07%,reaching the stand-ard of helium fields.The total gas content is 1.64 m3/t to 5.88 m3/t,with an average of 3.02 m3/t.The gas content decreases gradually from the central part of the syncline to the north and south ends,and decreases gradually from the core of the syncline to the two wings.The total gas content increases with depth and reaches its maximum at the bottom of Longmaxi Formation.The desorption gas accounts for 31.3%to 66.7%of the total gas content,and the loss gas accounts for 32.5%to 66.0%.Wells Ay1 and Ay4 located in the syncline core have the highest swing-to-suction ratio,which is 1.39 to 5.49,with an average of 2.20.They have better preservation conditions and re-coverable ability.The overall gas saturation is high,which is 58.85%to 86.18%,with an average of 75.60%.The resource prospect is good.
关键词
正安地区/黔北地区/五峰组—龙马溪组/页岩气/安场向斜/氦气/含气性Key words
Zheng'an area/Wufeng-Longmaxi Formation/shale gas/Anchang syncline/helium/gas bearing property引用本文复制引用
基金项目
贵州省科技厅2024年基础研究计划(自然科学)青年引导项目(黔科合基础[2024]青年379)
贵州省找矿突破战略行动重大协同创新项目(黔科合战略找矿[2022]ZD005)
贵州省科技厅科技支撑项目(黔科合支撑[2021]一般405)
出版年
2024
NETL
NSTL
万方数据