石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (3): 648-657.doi: 10.11743/ogg20220313
范柏江1(), 师良1, 杨杰2, 苏珊2, 马荣3, 袁耀利3, 曾陈宇1
收稿日期:
2021-06-06
修回日期:
2022-03-10
出版日期:
2022-06-01
发布日期:
2022-05-06
第一作者简介:
范柏江(1983—),男,博士、副教授,常规及非常规油气成藏机理。E?mail: 基金项目:
Bojiang Fan1(), Liang Shi1, Jie Yang2, Shan Su2, Rong Ma3, Yaoli Yuan3, Cengyu Zeng1
Received:
2021-06-06
Revised:
2022-03-10
Online:
2022-06-01
Published:
2022-05-06
摘要:
在采用能量色散X射线荧光技术的测试过程中,受能量配置探索不足的影响,所测元素的数量往往较少,导致无法充分利用元素参数来刻画古沉积环境。此外,陆相有机质的来源包括河流输入有机质和水体生产有机质,如何对其进行定量区分尚存困难。针对能量色散X射线荧光技术的能量配置进行了改进,由此将精确测试的元素数量扩充到28个。选择鄂尔多斯盆地中部延长组7段(长7段)页岩为研究对象,开展了有机碳、主要元素、微量元素的地球化学测试。在分析主要元素、微量元素等地球化学特征的基础上,对长7段有机质的沉积水体、氧化还原状态和生产力等古沉积环境进行了恢复,建立了有机质来源的数学模型,并分析了有机质的供给特征。研究结果表明,长7段有机质形成于偏温暖潮湿的气候背景,水体为偏贫氧和缺氧的淡水环境,古生产力较高但初级生产力不高。对于鄂尔多斯盆地中部地区的页岩有机质,水体来源有机质的贡献略大于陆源输入有机质的贡献。
中图分类号:
图2
鄂尔多斯盆地中部长7段页岩岩心特征a.纯页岩在水中渗气,W336井,埋深1 954.68 m,岩心照片; b.纯页岩在水中渗气,D214井,埋深1 172.72m,岩心照片; c.含砂质纹层页岩,F134井,埋深1 544.68 m,岩心照片; d.含砂质纹层页岩,D1199井,埋深1 365.19 m,岩心照片; e.纯页岩裂缝渗油,D214井,埋深1 170.46 m,岩心照片; f.页岩中植物碎屑遗迹,D19井,埋深1 369.91 m,岩心照片; g.页岩中可见生物扰动现象(有虫孔遗迹)及陆源腐殖有机质,YY1井,埋深135 6.26 m,铸体薄片,单偏光; h.页岩中含鱼骨(鱼鳞)化石,YCCV1245井,埋深1 562.63 m,铸体薄片,单偏光; i.页岩中含孢子体化石,YCCV1245井,埋深1 555.60 m,铸体薄片,单偏光"
表1
鄂尔多斯盆地中部长7段页岩元素含量数值"
元素 | 含量/10-6 | |
---|---|---|
范围 | 平均值 | |
Na | 2 990.32~4 645.05 | 3 777.75 |
Mg | 3 308.94~17 719.90 | 10 166.78 |
Al | 58 133.92~92 155.36 | 76 457.26 |
Si | 202 186.51~269 343.95 | 241 139.00 |
K | 17 498.39~31 706.56 | 24 754.35 |
Ca | 6 174.31~44 762.47 | 18 647.80 |
Ti | 2 673.77~4 572.67 | 3 822.25 |
Fe | 29 800.16~54 079.39 | 43 159.72 |
Ba | 636.97~4 775.12 | 1 622.07 |
Mn | 415.69~1 779.19 | 878.16 |
P | 306.92~1 316.63 | 631.08 |
V | 32.09~169.37 | 86.13 |
Cr | 29.29~110.18 | 78.49 |
Co | 9.47~50.88 | 26.04 |
Ni | 42.09~73.01 | 57.25 |
Cu | 20.18~63.25 | 42.61 |
Zn | 71.55~124.72 | 102.85 |
Ga | 14.46~31.11 | 22.86 |
As | 5.93~50.25 | 16.88 |
Pb | 13.01~33.69 | 18.72 |
Th | 7.84~17.44 | 12.67 |
U | 2.09~17.54 | 7.57 |
Y | 27.75~41.23 | 32.98 |
Zr | 90.93~190.26 | 139.23 |
Nb | 8.58~15.48 | 11.33 |
Mo | 0.19~7.03 | 2.75 |
Rb | 95.02~211.47 | 157.28 |
Sr | 303.15~508.52 | 391.40 |
表2
鄂尔多斯盆地中部长7段页岩微量元素的富集因子(EF)范围"
微量元素 | EF值 | 微量元素 | EF值 |
---|---|---|---|
Ba | 1.14~8.57(2.91) | As | 4.62~39.08(13.13) |
Ni | 0.82~1.42(1.11) | Pb | 0.76~1.97(1.09) |
U | 0.79~6.60(2.85) | Th | 0.63~1.39(1.01) |
V | 0.27~1.41(0.72) | Y | 1.20~1.78(1.42) |
Cr | 0.34~1.29(0.92) | Zr | 0.51~1.06(0.77) |
Co | 0.55~2.97(1.52) | Nb | 0.56~1.00(0.73) |
Cu | 0.47~1.48(0.99) | Mo | 0.22~8.20(3.20) |
Zn | 0.98~1.71(1.41) | Rb | 0.69~1.54(1.15) |
Ga | 0.84~1.81(1.33) | Sr | 1.77~2.97(2.28) |
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