印度尼西亚Berau盆地Sajau煤的x射线计算机断层扫描分析:清晰和微清晰特征的三维成像

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS
A. Hamdani
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引用次数: 8

摘要

白劳盆地地区上新世萨夭煤具有中等至高度发育的明净体系。理理裂缝多发育在明暗带,且理理裂缝一般与煤层顺层面倾斜或垂直。煤层中裂隙网的存在是煤层气勘探的重点。利用三维x射线计算机断层扫描(CT)技术对Sajau煤层的裂隙特征进行了识别,如煤层的裂隙方向、裂隙的几何形状和裂隙的成矿作用等。利用CT扫描成像技术,在萨夭煤中发现了两种不同类型的天然裂缝,即面缝和对接缝。该技术还可以识别出面部和臀部夹板的方向,如3D图像所示。从图像上看,面部夹板为NNE-SSW方向,臀部夹板为NW-SE方向。横切关系表明,NNE-SSW型理缝形成时间早于NW-SE型理缝。该程序还确定了填满裂缝的矿物类型。根据矿物的密度,将其划分为极高密度矿物(黄铁矿)、高密度矿物(绿铜矿)和低密度矿物(高岭石、方解石)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
X-Ray Computed Tomography Analysis of Sajau Coal, Berau Basin, Indonesia: 3D Imaging of Cleat and Microcleat Characteristics
The Pliocene Sajau coals of the Berau Basin area have a moderately to highly developed cleat system. Mostly the cleat fractures are well developed in both bright and dull bands, and these cleats are generally inclined or perpendicular to the bedding planes of the seam. The presence of cleat networks/fractures in coal seam is the important point in coalbed methane prospect. The 3D X-ray computed tomography (CT) technique was performed to identify cleats characteristics in the Sajau coal seams, such as the direction of coal cleats, geometry of cleat, and cleats mineralization. By CT scan imaging technique two different types of natural fractures observed in Sajau coals have been identified, that is, face cleats and butt cleats. This technique also identified the direction of face cleats and butt cleats as shown in the resulting 3D images. Based on the images, face cleats show a NNE-SSW direction while butt cleats have a NW-SE direction. The crosscutting relationship indicated that NNE-SSW cleats were formed earlier than NW-SE cleats. The procedure also identified the types of minerals that filled the cleats apertures. Based on their density, the minerals are categorized as follows: very high density minerals (pyrite), high density minerals (anastase), and low density minerals (kaolinite, calcite) were identified filling the cleats aperture.
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来源期刊
International Journal of Geophysics
International Journal of Geophysics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.50
自引率
0.00%
发文量
12
审稿时长
21 weeks
期刊介绍: International Journal of Geophysics is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of theoretical, observational, applied, and computational geophysics.
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