The effect of organic matter quantity and mineral composition on the adsorption capacity in the shales

Kim, Hayung; Jang, Hochang; Choi, Jiyoung

doi:10.31697/jpsg.2020.2.1.11

J Pet Sediment Geol 2(1):11-23

eISSN: 2635-7704

DOI: https://doi.org/10.31697/jpsg.2020.2.1.11

Article

유기물 함량과 광물 조성이 셰일 내 메탄가스 흡착능력에 미치는 영향

김하영¹, 장호창², 최지영³^,^*

The effect of organic matter quantity and mineral composition on the adsorption capacity in the shales

Hayung Kim¹, Hochang Jang², Jiyoung Choi³^,^*

Author Information & Copylight ▼

¹한국수자원공사 한강유역본부 한강사업계획처

¹강원대학교 에너지공학부 에너지자원융합공학전공

¹한국지질자원연구원 석유해저연구본부 석유가스연구센터

¹Hangang River Regional Head Office, Korea Water Resources Corporation

²Division of Energy Engineering, Kangwon National University

³Petroleum & Marine Research Division, Korea Institute of Geoscience and Mineral Resources

^*Corresponding Author : Jiyoung Choi, Tel: +82-42-868-3252, Fax: +82-42-868-3417, E-mail: jychoi@kigam.re.kr

ⓒ Copyright 2020 Korean Society of Petroleum and Sedimentary Geology. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permit unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Nov 20, 2019 ; Revised: Aug 20, 2020 ; Accepted: Aug 26, 2020

Published Online: Dec 01, 2020

요약

본 연구에서는 캐나다 수저리아드 분지(Liard Basin) 내 베사리버층(Besa River formation)의 엑쇼(Exshaw)와 패트리(Patry) 멤버에서 취득된 셰일 시료의 총유기탄소(total organic carbon, TOC), 주요 원소(major elements) 및 광물 함량에 따른 흡착 특성을 분석하기 위해 지화학 분석과 고압 메탄가스 흡착시험을 수행하였다. 대상 시료의 TOC는 3.18-9.86%로 나타났고, 주요 원소는 함량 순으로 SiO2, Al2O3, Fe2O3, CaO이었으며, 광물은 석영(quartz), 백운모/일라이트(muscovite/illite), 방해석(calcite), 황철석(pyrite)으로 구성됨을 확인하였다. 기존에 알려진 셰일의 흡착 특성을 고려하여 0 psig부터 약 4,500 psig까지 압력에 따라 흡착시험을 수행하였으며, 그 결과 흡착 능력을 대표하는 랭뮤어 부피(Langmuir volume)와 압력(Langmuir pressure)은 각각 101.8-167.0 scf/ton, 97.5-881.3 psia로 나타났다. 또한, TOC, 주요 원소, 광물 함량과 셰일의 랭뮤어 부피의 상관관계를 분석하였으며, 랭뮤어 부피는 TOC와는 무관하지만 SiO2 및 석영의 함량과 반비례하고, Al2O3를 비롯한 점토 광물의 함량과 비례하는 선형적인 관계를 나타냈다. 따라서 리아드 분지 셰일 시료의 흡착 능력과 지화학적 특성 간의 상관관계는 저류층 특성화(reservoir characterization)를 위한 주요 인자로 사용될 것으로 기대된다.

ABSTRACT

The purpose of this study is to investigate the adsorption characteristics with major element and mineral contents of shale samples from Exshaw and Patry members in the Besa River Formation of the Liard Basin. Geochemistry analysis and high pressure methane adsorption test are carried out to analyze the adsorption characteristics of total organic carbon (TOC) and major element and mineral composition of the shales. The results show that total organic carbon of the samples is in the range of 3.18-9.86%, and the major elements are dominated by SiO2, Al2O3, Fe2O3, and CaO. The mineral composition of the samples are composed of quartz, muscovite/illite, calcite, and pyrite. Adsorption tests are performed from 0 psig to 4,500 psig considering the known characteristics of the shale. Langmuir volume is in the range of 101.8-167.0 scf/ton, and Langmuir pressure is in the range of 97.5-881.3 psia, respectively. In addition, the correlation between TOC, major elements, mineral contents, and the Langmuir volume are analyzed. Langmuir volume is not related with TOC but inversely proportional to the SiO2 and quartz contents, and proportional to the clay content. Therefore, it is expected that the correlation between the adsorption capacity and the geochemical properties of shale samples in the Liard Basin is to be used as a major factor for reservoir characterization.

Keywords: 리아드분지; 셰일; 흡착성능; 총유기탄소; 광물조성

Keywords: Liard Basin; shale; adsorption capacity; TOC; mineralogy

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