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首页> 外文期刊>Indian Minerals >A PRELIMINARY EVALUATION OF EFFICACY OF GRAVITY SURVEY IN EXPLORATION FOR LIGNITE IN THE PALANA LIGNITE FIELD, DISTRICT BIKANER, RAJASTHAN
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A PRELIMINARY EVALUATION OF EFFICACY OF GRAVITY SURVEY IN EXPLORATION FOR LIGNITE IN THE PALANA LIGNITE FIELD, DISTRICT BIKANER, RAJASTHAN

机译：拉贾斯坦邦比卡纳地区PALANA褐铁矿田中褐铁矿勘探重力测量的初步评估

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摘要

Lignite-bearing sedimentary rock sequence of Lower Tertiary age occurs around Palana in the Bikaner district of Rajasthan (La Touche, 1902; Pareek, 1964 and Dutta, 1971). The lignite and associated rocks do not outcrop in the area and are buried under a thick pile of Quaternary deposits. For want of any surface indicator for lignite, geophysical gravity surveys were employed to delineate residual gravity 'lows' in the search for lignite. As the locations interpreted as gravity 'lows' are considered to be occupied by low-density material, these are indicative of probable lignite , occurrences (Telford et al, 1976). Test drilling for regional assessment of lignite was carried out with gravity surveys as one of the bases (Saxena and Sahiwala, 1992; Babulal et al., 1991). The idea of targeting gravity lows for delineation of lignite occurrences is based on the premise that lignite and associated clays, being low-density material, are prone to get reflected in the gravity lows. Since the presumption of locating lignite occurrences with the help of residual gravity concept is based on the fact that lignite is a low-density material, an attempt has been made to study the behaviour of gravity profile vis-a-vis the thickness of lignite seam and other sedimentological parameters such as cumulative thickness of sediments overlying Nagaur basement, thickness of Tertiary rocks, thickness of Quaternary rocks, thickness of Lathi formation, thickness of clay and thickness of arenaceous plus carbonate rocks up to a depth of 50 m (Table 1; Fig. 1,2). This preliminary study has been carried out with the help of four representative cross-sections in about 70 sq. km area to the north-east of Palana by examining lithological succession intersected in 11 boreholes (Fig. 1). During the course of investigation, a total of 67 boreholes were drilled in an area measuring 360' sq. km (approx). Lignite occurs mostly between 110m and 125 m depth and the maximum thickness of lignite seam recorded was 2.80 m.
机译：较低年龄的含褐煤的沉积岩层序在拉贾斯坦邦的比卡内尔地区的帕拉纳附近发生（拉塔什，1902;帕里克，1964;杜塔，1971）。褐煤和伴生的岩石不在该区域露头，而是被埋在厚厚的第四纪沉积物中。为了缺乏褐煤的表面指示剂，在寻找褐煤时，采用了地球物理重力调查来描绘残余重力“低点”。由于被解释为重力“低点”的位置被认为是低密度材料所占据的位置，因此这些位置指示着褐煤的发生（Telford等，1976）。以重力勘测为基础之一进行了褐煤区域评估试验钻探（Saxena和Sahiwala，1992; Babulal等，1991）。以重力低点为目标来描述褐煤的想法是基于这样的前提，即褐煤和相关的粘土（低密度材料）很容易在重力低点上得到反映。由于利用残余重力概念推定褐煤发生位置的推论是基于褐煤是一种低密度材料这一事实，因此已尝试研究重力剖面相对于褐煤煤层厚度的行为。以及其他沉积学参数，例如Nagaur基底上覆沉积物的累积厚度，第三纪岩石的厚度，第四纪岩石的厚度，Lathi地层的厚度，黏土的厚度以及直到50 m深度的砂质和碳酸盐岩的厚度（表1;图1,2）。这项初步研究是在帕拉纳东北部约70平方公里的地区，通过检查四个相交于11个钻孔的岩性演替（图1），完成了四个代表性断面的研究。在调查过程中，在面积约360平方公里（约）的区域钻了67个钻孔。褐煤主要发生在110m至125m深度之间，记录的褐煤接缝最大厚度为2.80m。

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