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    长岭断陷下白垩统湖相烃源岩形成古环境及主控因素

    李浩 陆建林 李瑞磊 王保华 徐文 左宗鑫 王苗 刘娅昭

    李浩, 陆建林, 李瑞磊, 王保华, 徐文, 左宗鑫, 王苗, 刘娅昭, 2017. 长岭断陷下白垩统湖相烃源岩形成古环境及主控因素. 地球科学, 42(10): 1774-1786. doi: 10.3799/dqkx.2017.539
    引用本文: 李浩, 陆建林, 李瑞磊, 王保华, 徐文, 左宗鑫, 王苗, 刘娅昭, 2017. 长岭断陷下白垩统湖相烃源岩形成古环境及主控因素. 地球科学, 42(10): 1774-1786. doi: 10.3799/dqkx.2017.539
    Li Hao, Lu Jianlin, Li Ruilei, Wang Baohua, Xu Wen, Zuo Zongxin, Wang Miao, Liu Yazhao, 2017. Generation Paleoenvironment and Its Controlling Factors of Lower Cretaceous Lacustrine Hydrocarbon Source Rocks in Changling Depression, South Songliao Basin. Earth Science, 42(10): 1774-1786. doi: 10.3799/dqkx.2017.539
    Citation: Li Hao, Lu Jianlin, Li Ruilei, Wang Baohua, Xu Wen, Zuo Zongxin, Wang Miao, Liu Yazhao, 2017. Generation Paleoenvironment and Its Controlling Factors of Lower Cretaceous Lacustrine Hydrocarbon Source Rocks in Changling Depression, South Songliao Basin. Earth Science, 42(10): 1774-1786. doi: 10.3799/dqkx.2017.539

    长岭断陷下白垩统湖相烃源岩形成古环境及主控因素

    doi: 10.3799/dqkx.2017.539
    基金项目: 

    中国石化科技部项目“长岭断陷结构充填特征及有利成藏组合研究” P13073

    国家“十三五”重大专项“陆相页岩油资源潜力评价与分布规律” 2017ZX05049-001-006

    详细信息
      作者简介:

      李浩(1984-),男,博士,主要从事油气成藏机理及非常规油气评价研究工作

    • 中图分类号: P631.81

    Generation Paleoenvironment and Its Controlling Factors of Lower Cretaceous Lacustrine Hydrocarbon Source Rocks in Changling Depression, South Songliao Basin

    • 摘要: 恢复烃源岩形成时期的古环境,落实优质烃源岩发育主控因素对确定湖相烃源岩发育层系及刻画烃源岩非均质性意义重大.利用岩石学、元素地球化学对长岭断陷早白垩世火石岭期至营城期的古环境进行恢复,并对反映古环境的微量元素含量及其比值与有机碳含量(Total Organic Carbon, TOC)进行相关性分析,确定控制湖相烃源岩发育的主要环境因素.研究表明,从火石岭期至沙河子期,再到营城期,长岭断陷经历了古水深从变深到变浅,古气候从潮湿-半潮湿气候到半干旱气候,古盐度从淡水相到半咸水相,湖泊水体还原性从增强到减弱的古环境演化过程,早白垩世不同时期长岭断陷古环境表现出明显的分带性,古气候和氧化还原条件是控制长岭断陷下白垩统湖相烃源岩发育的主要环境因素.长岭断陷沙河子组二段烃源岩形成于潮湿与缺氧的古环境,该时期湖盆演化处于均衡补偿阶段,且烃源岩古生产力较高,因此研究区沙河子组二段优质烃源岩十分发育,分布广.

       

    • 图  1  长岭断陷地理位置(a)及构造区划(b)

      Fig.  1.  Location of Changling depression (a) and tectonic division (b)

      图  2  长岭断陷下白垩统沉积充填及断陷期构造演化

      Fig.  2.  The sedimentary filling features of the lower Cretaceous and structural evolution in early Cretaceous

      图  3  长岭断陷下白垩统烃源岩TOC与S1+S2关系

      Fig.  3.  w(TOC)-S1+S2 crossplot of the lower Cretaceous source rocks in Changling depression

      图  4  长岭断陷下白垩统烃源岩干酪根碳同位素直方图

      Fig.  4.  The histogram of kerogen carbon isotopes of the lower Cretaceous source rocks in Changling depression

      图  5  长岭断陷下白垩统湖相烃源岩元素含量比Sr/Cu与古气候指数关系

      Fig.  5.  Relationship between Sr/Cu and paleoclimatic index in lacustrine source rocks of the lower Cretaceous samples from Changling depression

      图  6  长岭断陷下白垩统湖相烃源岩元素含量比V/Cr与Ni/Co关系

      Fig.  6.  Relationship between V/Cr and Ni/Co in lacustrine source rocks of the lower Cretaceous samples from Changling depression

      图  7  长岭断陷下白垩统湖相烃源岩元素含量比Sr/Ba与Sr含量关系

      Fig.  7.  Relationship between Sr/Ba and Sr in lacustrine source rocks of the lower Cretaceous samples from Changling depression

      图  8  龙凤山地区B2井下白垩统湖相烃源岩元素标志与古环境恢复

      Fig.  8.  Identification of the paleoenvironment by the vertical distribution of element contents in the lower Cretaceous lacustrine source rocks of B2 well from Longfengshan area, Changling depression

      图  9  伏龙泉地区SL3井下白垩统湖相烃源岩元素标志与古环境恢复

      Fig.  9.  Identification of the paleoenvironment by the vertical distribution of element contents in the lower Cretaceous lacustrine s Changling depression

      图  10  长岭断陷下白垩统烃源岩微量元素含量及其比值与TOC关系

      反映氧化还原条件的参数:微量元素含量Cr、Ni、V,元素含量比Ni/Co与V/Cr;反映古气候的参数:微量元素含量Cu,古气候指数,元素含量比Fe/Cu与Sr/Cu;反映古盐度的参数:微量元素含量Sr,元素含量比Sr/Ba与Sr/Ca

      Fig.  10.  Relationship between the element contents or its ratio and TOC in lacustrine source rocks of the lower Cretaceous samples from Changling depression

      图  11  长岭断陷下白垩统烃源岩反映古生产力的微量元素参数与TOC关系

      Fig.  11.  Relationship between TOC and trace element parameters reflected paleoproductivity of lacustrine source rocks of the lower Cretaceous samples from Changling depression

      表  1  SL3井下白垩统元素标志、水体相对深度及沉积环境划分

      Table  1.   Element indexes, relative water depth and sedimentary environments of the lower Cretaceous lacustrine source rocks of SL3 well

      层位 泥岩主要颜色 暗地比
      (%)
      Fe/Mn (Al+Fe)/(Ca+Mg) 反映古水深参考指标范围
      范围 均值 范围 均值
      营四段 灰色、褐色 1743~54 49 4.5~8.3 6.8三角洲平原 深湖:Fe/Mn<30,(Al+Fe)/(Ca+Mg)<2.5;半深湖:30<Fe/Mn<40,2.5<(Al+Fe)/(Ca+Mg)<5.0;滨浅湖:Fe /Mn>40,(Al+Fe)/(Ca+Mg)>5.0
      营三段 灰色、深灰色 4043~49 46 5.8~7.6 6.7滨浅湖
      营二段 灰色 6642~53 46 6.0~7.5 6.5滨浅湖
      营一段 灰色 1334~46 41 6.9~8.9 7.9滨浅湖
      沙二段 黑色、深灰色 8217~52 37 0.7~5.6 2.9深湖
      沙一段 深灰色,顶部灰黑色 6628~48 39 3.6~5.8 4.7半深湖
      火二段 深灰色 2538~65 48 5.0~8.2 6.6滨浅湖
      下载: 导出CSV

      表  2  古盐度微量元素判断指标

      Table  2.   Trace element index for paleosalinity recognition in samples

      判断指标 淡水 半咸水 咸水
      Sr丰度(10-6) <300 300~500 >500
      Sr/Ba <0.6 0.6~1.0 >1.0
        注:据郑荣才和柳梅青(1999)李进龙和陈东敬(2003).
      下载: 导出CSV
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