| 鄂尔多斯盆地直罗组地层岩性测井响应特征 |
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| 引用本文： | 俞礽安,司马献章,李建国,王善博,杨君,刘晓雪.鄂尔多斯盆地直罗组地层岩性测井响应特征[J].煤田地质与勘探,2018,46(6):33. |
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| 作者姓名： | 俞礽安 司马献章 李建国 王善博 杨君 刘晓雪 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）项目（2015CB453000）；中国地质调查局地质调查项目（DD20160127） |
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| 摘 要： | 为了准确划分直罗组地层岩性、识别地层及解译矿层，通过综合分析鄂尔多斯盆地4个主要铀矿集区侏罗系直罗组地层的定量伽马、自然电位、三侧向电阻率、密度4条测井曲线参数，采用归类统计和测井曲线形态分析，结果显示不同地区直罗组的伽马照射量率数值差异不大，东南缘地区电阻率值明显高于其他地区，密度值变化呈现"南高北低"特征；垂向上直罗组上段的伽马背景值和电阻率相对直罗组下段偏低，密度值变化不大；区域上直罗组地层中从粗砂岩到泥岩的伽玛背景值逐渐增高；密度值略微增高，电阻率和自然电位异常幅度由大变小。根据不同类型岩石测井参数和相系差异，建立了东北缘地区电阻率与密度交会图版岩性识别模型。煤田钻孔测井岩性解译时具有放射性异常的砂岩段粒度应提高1~2个级别。
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| 关 键 词： | 鄂尔多斯盆地 直罗组地层 测井 岩性识别 |
| 收稿时间： | 2018-07-15 |
Response characteristics of lithologic logging of Zhiluo Formation in Ordos basin |
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| Abstract: | For accurately classifying the strata lithology, identifying strata and interpreting ore beds of Zhiluo Formation, the parameters of four logging curves of Jurassic Zhiluo Formation in four major uranium ore accumulation areas in Ordos basin, including quantitative gamma, natural potential, trilateral resistivity and density, were comprehensively analyzed and classified, statistics and morphological analysis of logging curves were used. The results show that there was no significant difference in gamma radiation rate in Zhiluo Formation in different areas, the resistivity value in southeast margin was obviously higher than that in other areas, and the density value was characterized by being high in the south and low in the north; Vertically the gamma background value and resistivity of the upper section of Zhiluo Formation was are lower than that of the lower section, and the density value didn't not change much; Regionally from coarse sandstone to mudstone the gamma background value increased gradually; The density value increased slightly, and the abnormal amplitude of resistivity and natural potential changed from the high to the low. Based on the difference of logging parameters and facies of different types of rocks, the lithologic identification model of resistivity and density crossplot in the northeastern margin area and the logging facies characteristic of Zhiluo Formation in different ore accumulation areas were established. The granularity of sandstone sections with radioactive anomalies should be increased by 1-2 grades during lithological interpretation of coal logging. |
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