煤层中CO<sub>2</sub>注入运移瞬变电磁法监测技术探索

doi:10.11720/wtyht.2020.1429

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Abstract

The injection of CO₂ into the coal seam changes the CO₂ saturation of the coal seam.According to Archie's empirical formula,there are obvious differences in coal seam resistivity before and after CO₂ injection,which provides conditions for TEM monitoring.In the development of coalbed methane in Shizhuang North Block,the electrical resistivity changes of coalbed methane before and after CO₂ injection were monitored by TEM. The results show that the increase of electrical resistivity of coal seam can be caused by CO₂ injection in coal seam, and can be monitored by TEM. At the same time,the induced voltage can directly reflect the change of formation electrical characteristics caused by CO₂ injection.The equivalent resistivity from the surface to the coal seam is calculated by using the calculation formula of formation equivalent resistivity,and the transient electromagnetic sampling delay and the corresponding induced voltage of the formation near the coal seam are solved.The variation of induced voltage relative to background value reflects the change of formation electrical properties.The variation and rate of formation induced voltage caused by CO₂ injection are analyzed and calculated.Combined with the error range,the range of CO₂ migration enrichment zone can be inferred.

Key words： CO₂ injection monitoring transient electromagnetic method induction voltage coal seam

Received: 01 September 2019 Published: 24 June 2020

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	Fang-Zhi CUI
	Tao ZHOU
	Bing ZHANG

Cite this article:

Fang-Zhi CUI,Tao ZHOU,Bing ZHANG. TEM monitoring technology of CO₂ injection and transport in coal seam[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 573-581.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1429 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/573

Statistical table for calculating logging resistivity near coal seam of injection well

Formation column diagram of well SX006-1

Schematic diagram of work layout in the study area

Line 1240 apparent resistivity section
a—observation of background values in October 2011; b—observations after 700 tons of CO₂ was injected into well SX006-1 in November 2013; c—in October 2015, after 1 619 tons of CO₂ was injected into well SX006-1, the well was closed for 10 months,subsequent observation after 1 750 tons of CO₂ was injected into well SX006.Ellipse area is abnormal area,same as below

Line 1260 apparent resistivity section
observation after 1 460 tons of CO₂ was injected into well sx006-1 in November 2014

Planar contrast map of induced voltage in strata near coal seam
a—observation of background values in October 2011; b—observations after 700 tons of CO₂ was injected into well SX006-1 in November 2013; c—in October 2015, after injecting 1 619 tons of CO₂ into well SX006-1, the well was closed for 10 months,subsequent observation after injecting 1 750 tons of CO₂ into well SX006-2 and injecting 800 tons of CO₂ into well SX006-2

Plane diagram of relative variation of induced voltage of formation near coal seam to background value
a—700 tons of CO₂ was injected into well SX006-1 in November 2013; b—In October 2015, after injecting 1 619 tons of CO₂ into SX006-1 well, the well was closed for 10 months,subsequent 1 750 tons of CO₂ was injected into SX006 well and 800 tons of CO₂ was injected into SX006-2 well

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