A Study on the Formation Environment of Dolomite within the  Devonian Grosmont Formation,  Alberta,  Canada

Junghwan  Seol; Youngwoo Kil; Ji-Hoon  Kim; Jiyoung  Choi; Myong-Ho  Park; Il-Mo  Kang; Yunsoo  Jo

doi:10.12972/ksmer.2016.53.6.529

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2016 Vol.53, Issue 6 Next Page

Research Paper

A Study on the Formation Environment of Dolomite within the Devonian Grosmont Formation, Alberta, Canada 캐나다 앨버타 주에 분포하는 데본기 그로스몬트층 돌로마이트의 형성 환경 연구

31 December 2016. pp. 529-540

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Abstract

The Grosmont Formation is one of the massive bitumen-bearing carbonate deposits located in Alberta, Canada. Two cores (10-36-81-17W4 and 1-16-92-21W4) were collected from middle-eastern part of the Grosmont Platform. Geochemical data from both these two drilling cores and previous studies were used to identify the diagenetic characteristics of dolomite within the Devonian Grosmont Formation, composed of four sedimentary units (UG3, UG2, UG1, and LG). Upper Grosmont units (UG3 and UG2) were affected by dolomitization events on the near surface condition, whereas lower Grosmont units (UG1 and LG) were formed on the relatively shallow burial condition. The dolomites were formed by dolomitizing fluid originated from Devonian seawater. Isotopic results imply that formation temperature of dolomites within the Grosmont Formation ranges from 30 to 60°C, relatively low temperature.

Keywords

Grosmont formation

Dolomite

Dolomitization

Devonian seawater

Formation temperature

캐나다 앨버타 주에 위치하고 있는 그로스몬트층은 다량의 비투멘이 매장된 데본기 탄산염암 저류층으로 UG3, UG2, UG1, 그리고 LG의 단위층서로 구성되어 있다. 이번 연구에서는 그로스몬트층에서 일어난 탄산염암 속성작용의 특성을 규명하기 위하여 그로스몬트층 중앙 동부 지역에서 취득한 두 개의 시추코어(10-36-81-17W4, 1-16-92-21W4)에 대한 지화학 분석을 수행하였고 기존 연구 결과들과 비교분석하여, 그로스몬트층 돌로마이트의 종합적인 형성 환경을 해석하였다. 연구결과, 그로스몬트층은 크게 4개의 퇴적단위(UG3, UG2, UG1 및 LG)로 구성되며, 상부 UG3과 UG2는 천부환경에서 돌로마이트화작용의 영향을 받았으나, 하부 UG1과 LG는 매몰환경에서 부분적으로 돌로마이트가 형성된 것으로 판단된다. 동위원소 분석결과는 돌로마이트화작용을 일으키는데 영향을 미친 속성수는 데본기 해수이며, 돌로마이트의 생성온도는 비교적 낮은 약 30~60°C 이다.

키워드

그로스몬트층

돌로마이트

돌로마이트화작용

데본기 해수

생성온도

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 53
No :6
Pages :529-540
Received Date : 2016-04-14
Revised Date : 2016-06-20
Accepted Date : 2016-12-22
DOI :https://doi.org/10.12972/ksmer.2016.53.6.529

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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