吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (3): 747-756.doi: 10.13278/j.cnki.jjuese.20180307

• 地质与资源 • 上一篇    

宁夏固原炭山地区中侏罗统延安组油页岩特征及其沉积环境

海连富1, 王磊1, 马治军1, 徐清海2, 宋扬1, 白金鹤1   

  1. 1. 宁夏回族自治区矿产地质调查院, 银川 750021;
    2. 长江大学地球科学学院, 武汉 430100
  • 收稿日期:2018-11-22 发布日期:2020-05-29
  • 通讯作者: 徐清海(1988-),男,讲师,博士,主要从事矿产普查与勘探方面的研究,E-mail:786635796@qq.com E-mail:786635796@qq.com
  • 作者简介:海连富(1989-),男,回族,工程师,博士研究生,主要从事基础地质、矿产地质找矿方面的研究,E-mail:hailianfu@163.com
  • 基金资助:
    宁夏回族自治区自然科学基金项目（2018AAC03204）；宁夏回族自治区重点研发计划重大（重点）项目（2018BFG02013）；宁夏回族自治区地勘基金项目（2017地勘04）

Oil Shale Characteristics and Sedimentary Environment of Yan'an Formation in Middle Jurassic in Tanshan Area, Guyuan, Ningxia

Hai Lianfu1, Wang Lei1, Ma Zhijun1, Xu Qinghai2, Song Yang1, Bai Jinhe1   

  1. 1. Ningxia Hui Autonomous Region Mineral and Geological Survey Institute, Yinchuan 750021, China;
    2. Schoolof Earth Sciences, Yangtze University, Wuhan 430100, China
  • Received:2018-11-22 Published:2020-05-29
  • Supported by:
    Supported by Natural Science Foundation of Ningxia Hui Autonomous Region (2018AAC03204), Major (Key) Project in Key R & D Programs of Ningxia Hui Autonomous Region (2018BFG02013) and Geological Prospecting Fund Project of Ningxia Hui Autonomous Region (2017 Geological Prospecting 04)

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摘要： 宁夏固原炭山地区存在大量与煤伴生的油页岩资源，油页岩主要赋存于中侏罗统延安组中下部各含煤层系中。本文采集钻孔所获延安组油页岩岩心样品，通过低温干馏、主量元素测定以及钻井录井等方法对炭山地区油页岩特征进行了研究，明确了油页岩测井识别依据，恢复了油页岩沉积环境。研究表明：炭山地区油页岩主要以黑色、灰黑色、深灰色为主，质地较轻，密度小，硬度小，断口参差状、贝壳状，具油脂光泽、沥青光泽，块状层理发育；油页岩含油率为3.60%~9.00%，灰分质量分数为42.50%~79.05%，全硫质量分数为0.07%~1.37%，发热量为11.01 kJ/g（平均值），属中品质、硅质灰分、低硫且与煤伴生的油页岩；油页岩中w（SiO2）变化较大，为53.89%~65.55%，w（Al2O3）为17.45%~23.29%，w（K2O）明显高于w（Na2O），w（Fe2O3+MgO）为12.75%~21.98%，表明油页岩中含有较多的含钾矿物和镁铁成分；另外，Al2O3/（CaO+Na2O）值为3.09~21.12，揭示油页岩稳定组分含量较高。炭山地区油页岩测井曲线特征明显区别于煤层和泥岩，油页岩长距伽马、声波时差和密度介于煤层与泥岩之间，而电阻率明显低于煤层和泥岩。炭山地区油页岩化学蚀变指数为74.87~84.35，Sr/Ba值为0.33~0.83，平均为0.61，Th/U值为1.00~3.50，表明本地区油页岩沉积环境为温暖、温润的缺氧、贫氧的陆相淡水湖泊环境和沼泽环境。

关键词: 油页岩, 含油率, 沉积环境, 延安组, 炭山地区

Abstract: There are abundant oil shale resources accompanied with coal in Tanshan area. Oil shale are mainly existed in coal-bearing strata of the middle and lower part of Yan'an Formation in Middle Jurassic. Based on the oil shale samples of Yan'an Formation obtained from boreholes, the characteristics and sedimentary environments were studied, and the identification basis of oil shale logging was defined in Tanshan area by low-temperature dry distillation, main element measurement,and drilling logging. The research shows that the oil shale in Tanshan area is mainly black, grayish black and dark gray, with light texture, low density,and low hardness. The oil shale has the characteristics of staggered, shell-like fracture, grease, asphalt luster, and block layer development. The oil-bearing ratio is 3.60%-9.00%, the ash is 42.50%-79.05%, the total sulfur is 0.07%-1.37%, and the calorific value is 11.01 kJ/g (average value), which belongs to medium quality because it is siliceous ash, low sulfur, and associated with coal. The content of SiO2 in oil shale varies greatly from 53.89% to 65.55%, Al2O3 is 17.45%-23.29%, K2O is significantly higher than Na2O, and Fe2O3+MgO value is 12.75%-21.98%, containing many potassium-bearing minerals and magnesium iron components. The Al2O3/(CaO+Na2O) value is 3.09-21.12, which reveals that the stable components in oil shale are high. The logging curves characteristics of oil shale are obviously different from the coal seams and mudstones. The data of gamma, sonic and density of oil shale are between the coal seam and the mudstone, and the resistivity is significantly lower than the coal seam and mudstone. The chemical alteration index of oil shale is 74.87-84.35, Sr/Ba value is 0.33-0.83 with average of 0.61, and Th/U value is 1.00-3.50, indicating that the oil shale sedimentary environment in Tanshan area was a warm, anoxic, and oxygen-poor terrestrial freshwater lake environment.

Key words: oil shale, oil-bearing ratio, sedimentary environments, Yan'an Formation, Tanshan area

中图分类号: 

  • P618.12
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