页岩释气过程中碳同位素的分馏特征

陶成; 翟常博; 俞凌杰; 申宝剑; 王杰; 杨华敏

doi:10.11781/sysydz202001113

页岩释气过程中碳同位素的分馏特征

doi: 10.11781/sysydz202001113

陶成^{1, 2,},
翟常博¹,
俞凌杰¹,
申宝剑¹,
王杰¹,
杨华敏¹

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
页岩油气富集机理与有效开发国家重点实验室, 江苏无锡 214126

基金项目:

国家科技重大专项 2016ZX05060

国家自然科学重点基金 U1663202

详细信息

作者简介:
陶成(1978-), 男, 博士, 高级工程师, 从事同位素地球化学研究。E-mail: tc60@163.com

中图分类号: TE135
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出版历程
- 收稿日期: 2019-08-29
- 修回日期: 2019-11-01
- 刊出日期: 2020-01-28

Carbon isotope fractionation characteristics during shale gas release

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China

摘要

摘要: 钻井现场开展页岩岩心解吸气同位素监测，由于损失气样品缺失，而不能得到岩心气体释放全过程同位素的变化规律。通过加工岩心甲烷高压饱和-解吸装置，并接入色谱-同位素质谱联机系统，满足在线实时监测解吸气甲烷碳同位素变化的要求。在此基础上，开展页岩岩心释气的正演模拟实验，发现了解吸气甲烷碳同位素先期稳定、后期变轻后逐渐变重的变化规律，揭示了岩心中游离气和吸附气的相态转化、二者混合比例的动态演化与同位素变化趋势的相关性，表明同位素在页岩气开发状态的示踪方面具有应用潜力。
- 碳同位素 /
- 同位素分馏 /
- 甲烷 /
- 页岩气
Abstract: The isotope monitoring of desorption gas from shale cores was carried out at the drill site. Gas is lost during core recovery and thus the isotope variation for the whole process of gas release from shale cores cannot be obtained. A high pressure methane saturation-desorption device was developed and connected to the chromatographic-isotope mass spectrometry system to monitor the carbon isotope change of released CH₄ on-line. The isotopic curves of releaed methane were initially stable, and then tended to become lighter and finally heavier, which was related to the phase transformation and the mixing ratio of free gas and adsorbed gas. Isotopes have potential applications in monitoring shale gas development.
- carbon isotope /
- isotopic fractionation /
- methane /
- shale gas

HTML全文

图 1 页岩高压饱和气体解吸过程的同位素分馏实验装置

Figure 1. High pressure saturation-desorption isotope fractionation device for shale

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图 2 页岩岩心中甲烷解吸碳同位素分馏模拟实验

Figure 2. Carbon isotope fractionation test for CH₄ desorbed from shale cores

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表 1 在线连续流甲烷碳同位素重复性检测

Table 1. On-line continuous flow methane isotope repeatability measurement

序号	信号强度44 mV	信号强度45 mV	δ¹³C_CH₄/‰	序号	信号强度44 mV	信号强度45 mV	δ¹³C_CH₄/‰
1	20 042	22 619	-42.00	7	19 940	22 497	-41.92
2	20 056	22 633	-41.92	8	19 916	22 470	-41.92
3	19 994	22 563	-41.94	9	19 951	22 510	-41.92
4	19 775	22 313	-42.01	10	20 002	22 565	-41.95
5	19 733	22 264	-41.96	11	19 757	22 285	-41.94
6	19 882	22 435	-41.96	12	20 005	22 567	-41.94

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