华北板块南缘六盘山盆地固参1井马东山组泥页岩段古沉积环境研究
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本文为宁夏回族自治区地质局科技计划项目(编号:宁地科发[2016]号)的成果


Paleosedimentary environmental study of mud—shale member of Madongshan Formation of well Gucan1 in Liupanshan Basin, North China Plate
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    摘要:

    以六盘山盆地固参1井白垩系马东山组泥页岩段为研究对象,通过元素地球化学测试分析,采用CaO/(MgO·Al2O3)、Sr/Cu、Rb/Sr、Sr /Ba、Sr丰度、Th/U、 V/Cr、V/(V+Ni)、Fe/Mn和(Al+Fe)/(Ca+Mg)等一系列古气候、古盐度、古氧化还原条件和古水深判别指标,对固参1井马东山组泥页岩沉积古环境进行探讨。结果表明:马东山组泥页岩沉积时期总体为年平均古气温应大于15℃的温暖潮湿气候,水体为半深湖—滨浅湖的半咸水—咸水环境,沉积物是在贫养—厌氧环境中形成的。古气候、古盐度、古氧化还原条件及古水深在垂向上存在3个相对变化的旋回,且古气候与古水深、古还原条件呈正相关性,与盐度呈负相关性。适宜的古水深、较强的还原条件,稳定匮乏的碎屑供给等古环境因素相对变化的3个旋回共同控制了马东山组泥岩、页岩、钙质泥岩、泥灰岩组合的非均质的页岩油气储层。

    Abstract:

    Objectives: Paleosedimentary environmental study of mud—shale member of Cretaceous Madongshan Formation(Fm. ) in the Liupanshan Basin includes the paleoclimate, paleosalinity, paleoredox conditions and paleobathymetric through 10 samples collected from well Gucan1 in the basin. Methods: Based on geochemical element analysis and a series of identification indexes of paleoclimate, paleosalinity, paleoredox conditions and paleobathymetric,such as CaO/(MgO·Al2O3), Sr/Cu, Rb/Sr, Sr /Ba, Sr abundance, Th/U, V/Cr, V/(V+Ni), Fe/Mn and (Al+Fe)/(Ca+Mg) to restored its Paleosedimentary environmental. Results: Comprehensive analysis shown that the sedimentary period of mud—shale member in the Madongshan Fm. , the paleoclimate was warm temperate higher than 15 ℃,the water body was brackish—salt water of semideep to shallow lake, and the sediments were deposited under strong reduction conditions. The paleoclimate, paleosalinity, paleoredox conditions and paleobathymetric had 3 relative changes cycles in vertical direction, and the paleoclimate had a positive correlation with paleoredox conditions and paleobathymetric while had a negative correlation with paleosalinity. Conclusions: Paleoenvironmets factors of relative changes of 3 cycles such as appropriate paleodepth, strong reduction conditions, stable and scarce supply debris jointly control the heterogeneous of unconventional shale and gas reservoir facies of the Madongshan Fm.

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马风华,潘进礼,马瑞赟,吴文忠,张勇,马小娟.2019.华北板块南缘六盘山盆地固参1井马东山组泥页岩段古沉积环境研究[J].地质论评,65(5):1123-1130,[DOI].
MA Fenghua, PAN Jinli, MA Ruiyun, WU Wenzhong, ZHANG Yong, MA Xiaojuan.2019. Paleosedimentary environmental study of mud—shale member of Madongshan Formation of well Gucan1 in Liupanshan Basin, North China Plate[J]. Geological Review,65(5):1123-1130.

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  • 收稿日期:2019-03-07
  • 最后修改日期:2019-07-18
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  • 在线发布日期: 2019-09-19
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