结合电阻率层析成像和高分辨率浅层地震分析，用于印度塔尔彻煤田的煤炭勘探

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2024-05-19 DOI:10.1007/s11600-024-01349-9

Arvind Yadav, Thinesh Kumar, Anurag Tripathi, Sanjit Kumar Pal, Shalivahan

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引用次数: 0

摘要

塔尔彻煤田是印度热能级煤储量最重要的煤田之一；然而，几乎没有任何公开发表的地球物理研究可用于绘制地下煤层、作物带、断层位置、地层边界等。在本研究中，对印度奥迪沙塔尔彻煤田东北部戈里班德的五个剖面的电阻率层析成像（ERT）和两个剖面的高分辨率浅层地震（HRSS）勘测进行了综合分析，以研究煤层的结构控制，并划分煤炭潜力区和非煤区。利用三个钻孔的地质岩芯数据验证了 ERT 和 HRSS 结果。三个 ERT 剖面（ERT_P1、ERT_P2 和 ERT_P3）的数据采集方向与走向垂直，两个 ERT 剖面（ERT_P4 和 ERT_P5）的数据采集方向与走向一致。在走向方向采集 ERT 数据的目的是将倾角线和走向线交叉点的电阻率值关联起来。两个 HRSS 剖面（HRSS_P1 和 HRSS_P2）数据是沿着 ERT 剖面（ERT_P1 和 ERT_P2）的两条相应倾角线采集的。ERT 数据采用温纳-施伦贝谢阵列采集，电极间距为 10 米，采用多次滚动排列，以覆盖所需的剖面长度，剖面线间距约为 200 米。HRSS 数据采用 "端对射 "方法采集，使用 24 倍共同深度点勘测，地震检波器间距为 4 米，采用多个滚动沿线序列，以覆盖所需的剖面长度，剖面线间距约为 200 米，其中近距和远距分别为 88 米和 276 米。使用 Paradigm 19 地震处理软件分析了 HRSS 数据。对 5 个二维 ERT 剖面（ERT_P5-ERT_P1）和 2 个 HRSS 剖面（HRSS_P1 和 HRSS_P2）的综合分析表明，研究区南部的特点是高电阻率（100-500 Ωm）分布相对较低至中等，而地震剖面显示出多个强反射地层，这是钻孔中发现的碳质地层造成的，表明存在 Barakar 地层。北部的特点是高电阻率（200-1000 Ωm）分布，而地震剖面则显示出多个分布的小反射体，这是由于巨石层和或致密砂岩造成的。对 ERT 和 HRSS 数据的综合研究划定了一个突出的 F4 断层带，表明了 Talchir 和 Barakar 地层之间的接触边界。

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Combined electrical resistivity tomography and high-resolution shallow seismic analysis for coal exploration in Talcher Coalfield, India

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Combined electrical resistivity tomography and high-resolution shallow seismic analysis for coal exploration in Talcher Coalfield, India

Talcher Coalfield is one of the most important coalfields considering thermal grade coal reserves in India; nevertheless, hardly any published geophysical study is available for mapping the subsurface coal, in-crop zone, fault location, formation boundary, etc. In the present study, a combined analysis of electrical resistivity tomography (ERT) in five profiles and high-resolution shallow seismic (HRSS) survey in two profiles was carried out in Goribandh at the northern–eastern part of the Talcher Coalfield, Odisha, India, to study the structural control of coal seams and to delineate the coal potential zone and non-coal zone. Geological core data from three boreholes were utilized to validate the ERT and HRSS results. Three ERT profiles (ERT_P1, ERT_P2, and ERT_P3) data were acquired in perpendicular to the strike direction, and two ERT profiles (ERT_P4 and ERT_P5) data were collected in the strike direction. The purpose of the acquisition of ERT data in the strike direction is to correlate the resistivity values at the cross point of dip lines and strike lines. Two HRSS profiles (HRSS_P1 and HRSS_P2) data were collected along the same two corresponding dip lines of the ERT profiles (ERT_P1 and ERT_P2). The ERT data were collected using Wenner–Schlumberger array at 10 m electrode spacing with multiple roll-along sequences to cover the desired profile length with an approximate profile line spacing of 200 m. The Res2Dinv program was used to execute the inversion of the combined data set. The HRSS data were acquired by ‘End-on-Shooting’ method using 24-fold common depth point survey at 4 m geophone spacing with multiple roll-along sequences to cover the desired profile length with approximate profile line spacing of 200 m, where near trace and far offsets trace were 88 and 276 m, respectively. HRSS data were analyzed using Paradigm 19 seismic processing software. Comprehensive analysis of five numbers of 2D ERT sections (ERT_P1-ERT_P5) and two numbers of HRSS sections (HRSS_P1 and HRSS_P2) indicates that the southern part of the study area is characterized by relatively low to moderate high resistivity (100–500 Ωm) distribution while seismic sections demonstrate multiple strong reflecting horizons, due to carbonaceous beds as identified in the boreholes, indicating Barakar formation. The northern part is characterized by high resistivity (200–1000 Ωm) distribution, while seismic sections exhibit multiple distributed minor reflectors due to boulder beds and or compact sandstone. The combined study of ERT and HRSS data delineates a prominent fault zone F4, indicating a contact boundary between the Talchir and Barakar formations.

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来源期刊

Acta Geophysica GEOCHEMISTRY & GEOPHYSICS-

CiteScore

3.80

自引率

13.00%

发文量

251

期刊介绍： Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.