中扬子宜昌地区下寒武统水井沱组页岩现场解吸气特征及地质意义

doi:10.7623/syxb201908005

石油学报 ›› 2019, Vol. 40 ›› Issue (8): 941-955.DOI: 10.7623/syxb201908005

中扬子宜昌地区下寒武统水井沱组页岩现场解吸气特征及地质意义

罗胜元¹, 陈孝红¹, 刘安¹, 李海¹, 孙冲²

1. 中国地质调查局武汉地质调查中心湖北武汉 430205;
2. 中国石油化工股份有限公司江汉油田分公司勘探开发研究院石油地质测试中心湖北武汉 430223

收稿日期:2018-04-26 修回日期:2018-08-15 出版日期:2019-08-25 发布日期:2019-08-28
通讯作者: 罗胜元,男,1986年11月生,2009年获中国地质大学(武汉)学士学位,2014年获中国地质大学(武汉)矿产普查与勘探专业博士学位,现为中国地质调查局武汉地质调查中心工程师,主要从事页岩气、油气地质调查与研究工作。Email:loshyv@163.com
作者简介:罗胜元,男,1986年11月生,2009年获中国地质大学(武汉)学士学位,2014年获中国地质大学(武汉)矿产普查与勘探专业博士学位,现为中国地质调查局武汉地质调查中心工程师,主要从事页岩气、油气地质调查与研究工作。Email:loshyv@163.com
基金资助:
国家科技重大专项"中扬子高演化页岩气赋存机理与富集规律研究"（2016ZX05034-001-002）及中国地质调查局"宜昌斜坡页岩气有利区战略调查"项目（DD20179615）资助。

Characteristics and geological significance of canister desorption gas from the Lower Cambrian Shuijingtuo Formation shale in Yichang area,Middle Yangtze region

Luo Shengyuan¹, Chen Xiaohong¹, Liu An¹, Li Hai¹, Sun Chong²

1. Wuhan Center, China Geological Survey, Hubei Wuhan 430205, China;
2. Petroleum Geologic Test Center, Petroleum Exploration and Development Research Institute, Sinopec Jianghan Oilfield Company, Hubei Wuhan 430223, China

Received:2018-04-26 Revised:2018-08-15 Online:2019-08-25 Published:2019-08-28

摘要/Abstract

摘要：

中扬子宜昌地区下寒武统水井沱组页岩具有良好的气体显示，是四川盆地外页岩气新的勘探区。通过对2口页岩气探井共64块水井沱组页岩的含气性现场解吸，测定了解吸气含量、气体组分、解吸气碳和氢稳定同位素组成，分析了解吸气组分变化、解吸过程中气态烃和二氧化碳同位素的变化，同时探讨了页岩气赋存状态、气体稳定同位素倒转特点及其地质意义。研究结果表明：水井沱组页岩现场解吸气含量为0.32~5.48 m³/t，连续含气量大于2 m³/t的地层厚44.05 m，含气性与TOC有很强的正相关性；解吸气甲烷含量为81.90%~95.48%，乙烷含量为0.78%~3.95%，含微量丙烷，为典型的干气；非烃气体中氮气含量稍高，平均约为6.7%，二氧化碳含量低于1%，不含H₂S；吸附气占50%~60%，游离气占40%~50%。解吸早期吸附性弱的CH₄和N₂先脱附出来，吸附性强的C₂H₆和CO₂后脱附出来，至解吸结束仍有相当量的C₂H₆和CO₂未脱附出来。解吸过程中碳、氢同位素均发生变化，δ¹³C_CH₄变化范围为-39.92 ‰~-25.86 ‰，δ¹³C_C₂H₆为-41.57 ‰~-39.34 ‰，δ¹³C_C₃H₈为-40.89 ‰~-35.46 ‰，δ¹³C_CO₂为-23.42 ‰~-19.23 ‰；δD_CH₄为-136.90 ‰~-128.00 ‰，δD_C₂H₆为-160.45 ‰~-155.30 ‰；由于同位素的质量分馏效应，解吸过程中残留的甲烷碳同位素增大了5.15 ‰~13.33 ‰，甲烷氢同位素增大1.64 ‰~8.90 ‰，乙烷碳、氢同位素和二氧化碳的碳同位素基本不变。气体碳同位素分馏还受页岩物性的影响，大的孔隙体积引起更显著的甲烷碳同位素分馏效果，同时还引起乙烷体积含量的差异。利用解吸半量体积所取气样的同位素值代表全部气体的平均值，δ¹³C_CH₄平均值为-33.19 ‰，δ¹³C_C₂H₆平均值为-40.04 ‰，δ¹³C_C₃H₈平均值为-39.07 ‰，页岩气表现出δ¹³C_CH₄ > δ¹³C_C₂H₆且δ¹³C_C₃H₈ > δ¹³C_C₂H₆、δD_CH₄ > δD_C₂H₆的同位素"倒序"特征。与威远地区下寒武统筇竹寺组类似，宜昌地区水井沱组页岩气同样处于气态烃同位素反转阶段的早期，具有多源复合热成因气的特点。

关键词: 页岩气, 现场解吸, 气体组分, 碳同位素, 氢同位素, 下寒武统水井沱组, 中扬子地区

Abstract:

As displaying good gas reserves, the Lower Cambrian Shuijingtuo Formation shale in Yichang area, Middle Yangtze region is a new exploration area of shale gas in Sichuan Basin. Based on the onsite analysis of gas-bearing property for 64 pieces of Shuijingtuo Formation gas shale from two shale gas exploration wells, this paper determines the analytical gas content, gas composition, carbon and hydrogen stable isotopic composition of analytical gas, analyzes the changes in the analytical gas composition and the gaseous hydrocarbon and carbon dioxide isotope during analytical process, and explores the occurrence state of shale gas, inversion characteristics and geological significance of gas stable isotope. The results show that Shuijingtuo Formation shale contains the analytical gas of 0.32-5.48 m³/t, and the formation with continuous gas content greater than 2 m³/t is 44.05 m thick, demonstrating a strong positive correlation between gas content and TOC. The analytical gas contains methane and ethane of 81.90% -95.48% and 0.78% -3.95%, respectively and also a trace of propane, classified as a typical dry gas; the content of nitrogen is a bit high in non-hydrocarbon gases, with an average of about 6.7%, and the carbon dioxide content is less than 1%, free of H₂S. The adsorption gas and free gas accounts for 50% -60% and 40% -50% respectively. In the early stage of adsorption, CH₄ and N₂, with weak adsorbability, are first desorbed, followed by C₂H₆ and CO₂, with strong adsorbability; until the end of gas analysis, a considerable amount of C₂H₆ and CO₂ still has not been desorbed. During the analytical process, the carbon and hydrogen isotopes have changed, the variation range of δ¹³CH₄, δ¹³C₂H₆, δ¹³C₃H₈, δ¹³CO₂, δD_CH₄ and δD_C₂H₆ is -39.92 ‰--25.86 ‰, -41.57 ‰--39.34 ‰, -40.89 ‰--35.46 ‰, -23.42 ‰--19.23 ‰, -136.90 ‰--128.00 ‰ and -160.45 ‰--155.30 ‰, respectively. Due to the mass fractionation effect of isotope, the methane carbon isotope and methane hydrogen isotope remained in the analytical process is increased by 5.15 ‰ -13.33 ‰ and 1.64 ‰ -8.90 ‰ respectively; the ethane carbon, hydrogen isotope and carbon isotope of carbon dioxide is basically unchanged. The gaseous carbon isotope fractionation is also affected by the physical properties of shale, and the larger pore volume will lead to a more significant methane carbon isotope fractionation effect, as well as a difference in the volume content of ethane. The isotope value of the gas sample taken by desorbing the half volume represents the average value of all gases; the average value of δ¹³CH₄, δ¹³C₂H₆ and δ¹³C₃H₈ is -33.19 ‰, -40.04 ‰ and -39.07 ‰, respectively; the shale gas shows the "reverse order" feature of isotope:δ¹³CH₄ > δ¹³C₂H₆,δ¹³C₂H₆ < δ¹³C₃H₈, δD_CH₄ > δD_C₂H₆. Similar to the Lower Cambrian Qizhusi Formation in Weiyuan, Shuijingtuo Formation shale gas in Yichang area is also in the early stage of reversal of gaseous hydrocarbon isotope, and has the characteristics of multi-source composite thermogenic gas.

Key words: shale gas, canister desorption, gas component, carbon isotope, hydrogen isotope, Lower Cambrian Shuijingtuo Formation, Middle Yangtze region

中图分类号:

TE132.2

罗胜元, 陈孝红, 刘安, 李海, 孙冲. 中扬子宜昌地区下寒武统水井沱组页岩现场解吸气特征及地质意义[J]. 石油学报, 2019, 40(8): 941-955.

Luo Shengyuan, Chen Xiaohong, Liu An, Li Hai, Sun Chong. Characteristics and geological significance of canister desorption gas from the Lower Cambrian Shuijingtuo Formation shale in Yichang area,Middle Yangtze region[J]. Acta Petrolei Sinica, 2019, 40(8): 941-955.

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中扬子宜昌地区下寒武统水井沱组页岩现场解吸气特征及地质意义

Characteristics and geological significance of canister desorption gas from the Lower Cambrian Shuijingtuo Formation shale in Yichang area,Middle Yangtze region

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