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http://dx.doi.org/10.9727/jmsk.2017.30.3.113

Mineral Compositions and Distribution in the Drilling Cores from the Miocene Pohang Basin, Korea  

Lee, Jinhyun (Department of Geological Environmental Sciences, Pusan National University)
Hwang, Jinyeon (Department of Geological Environmental Sciences, Pusan National University)
Son, Moon (Department of Geological Environmental Sciences, Pusan National University)
Son, Byeong Seo (Department of Geological Environmental Sciences, Pusan National University)
Oh, Jiho (Department of Geological Environmental Sciences, Pusan National University)
Lee, Hyomin (Department of Geological Environmental Sciences, Pusan National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.30, no.3, 2017 , pp. 113-126 More about this Journal
Abstract
In order to investigate the geological storage potential of $CO_2$, X-ray diffraction analysis were conducted for drilling core samples collected from the two drilling sites located in Yonil group of the Miocene Pohang Basin. As a result, various minerals were identified such as quartz, plagioclase, orthoclase opal-CT, smectite, mica, illite, kaolin mineral, chlorite, calcite, gypsum, pyrite, dolomite, and siderite. Smectite was detected in almost all of core samples, and relatively large amounts of smectite were observed in the cores from deeper strata. Opal-CT, mainly occurred in the upper interval of cores, was formed by diagenesis of amorphous diatoms. It shows a tendency that d101 value of cristobalite decreases with depth from $4.10{\AA}$ to $4.05{\AA}$. The almost identical variations in mineral composition with depth are observed at the two sites. This fact indicates that rocks distributed at the two sites were probably deposited in the similar depositional environments. It is determined that the strata in the study area can play roles of cap-rock for $CO_2$ storage, because the considerable amounts of smectite were contained in the rocks through the cores.
Keywords
Pohang Basin; Yeonil Group; Smectite; Opal-CT; Diagenesis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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