Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (2): 365-377.doi: 10.11743/ogg20220210
• Petroleum Geology • Previous Articles Next Articles
Jinyu Tao1,2,3,4(), Zongquan Hu5, Baojian Shen1,2,3,4, Anyang Pan1,2,3,4, Chuxiong Li1,2,3,4, Ruihu Wang6, Meiling Zhang6
Received:
2020-07-31
Revised:
2022-01-20
Online:
2022-04-01
Published:
2022-03-11
CLC Number:
Jinyu Tao, Zongquan Hu, Baojian Shen, Anyang Pan, Chuxiong Li, Ruihu Wang, Meiling Zhang. Sedimentary characteristics and model of platform-trough shale in the Lower Carboniferous, Guizhong Depression, Dianqiangui Basin[J]. Oil & Gas Geology, 2022, 43(2): 365-377.
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Table 1
Mineral composition of platform?trough shale in the Luzhai Formation, Guizhong Depression"
井/剖面样品号 | TOC/% | 矿物成分含量/% | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
粘土矿物 | 石英 | 钾长石 | 斜长石 | 方解石 | 白云石 | 菱铁矿 | 黄铁矿 | 石膏 | 硬石膏 | 石盐 | 重晶石 | ||
白花-1 | 3.80 | 12.1 | 86.2 | 0 | 0.3 | 0.1 | 0.1 | 0.2 | 0.5 | 0 | 0.2 | 0 | 0.3 |
白花-2 | 5.24 | 28.3 | 68.3 | 0.1 | 1.1 | 0.6 | 0.7 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0 |
白花-3 | 5.37 | 43.4 | 51.2 | 0.2 | 0.8 | 0.7 | 1.0 | 0.7 | 1.0 | 0 | 0.4 | 0 | 0.6 |
白花-4 | 4.47 | 24.7 | 73.5 | 0.1 | 0.3 | 0.4 | 0.6 | 0.3 | 0 | 0 | 0.1 | 0 | 0 |
白花-5 | 4.04 | 22.9 | 75.8 | 0.1 | 0.3 | 0.3 | 0.1 | 0.2 | 0.1 | 0 | 0.2 | 0 | 0 |
白花-6 | 5.95 | 26.3 | 70.3 | 0.1 | 0.4 | 0.5 | 0.8 | 1.1 | 0.3 | 0 | 0.2 | 0 | 0 |
白花-7 | 6.61 | 29.9 | 68.6 | 0.2 | 0.3 | 0 | 0.1 | 0.4 | 0.3 | 0.1 | 0.1 | 0 | 0 |
A井-1 | 3.91 | 19.9 | 56.5 | 0.1 | 2.3 | 16.8 | 0.8 | 0.2 | 3.0 | 0.1 | 0.2 | 0.1 | 0 |
A井-2 | 1.03 | 5.7 | 25.2 | 0.1 | 0.9 | 66.6 | 0.7 | 0.1 | 0.5 | 0 | 0.2 | 0 | 0 |
A井-3 | 5.00 | 24.5 | 62.3 | 0.2 | 3.2 | 0.4 | 1.0 | 0.4 | 6.4 | 0.1 | 0.3 | 0.1 | 1.1 |
A井-4 | 3.59 | 17.2 | 71.3 | 0 | 0.7 | 7.8 | 0.3 | 0.3 | 2.1 | 0.1 | 0.2 | 0 | 0 |
A井-5 | 3.81 | 16.8 | 70.0 | 0 | 1.3 | 8.7 | 0.4 | 0.1 | 2.3 | 0.1 | 0.3 | 0 | 0 |
A井-6 | 3.45 | 19.6 | 69.9 | 0.1 | 1.4 | 5.7 | 0.5 | 0.2 | 2.2 | 0.1 | 0.2 | 0.1 | 0 |
A井-7 | 3.89 | 26.0 | 50.2 | 0 | 1.6 | 17.3 | 0.3 | 0.5 | 3.5 | 0.2 | 0.3 | 0.1 | 0 |
A井-8 | 5.27 | 27.6 | 62.5 | 0.1 | 2.2 | 3.1 | 0.7 | 0.4 | 3.2 | 0 | 0.2 | 0 | 0 |
A井-9 | 3.02 | 28.2 | 57.7 | 0.3 | 0.9 | 8.3 | 0.9 | 0.3 | 3.0 | 0.1 | 0.3 | 0 | 0 |
A井-10 | 5.89 | 25.7 | 54.9 | 0.1 | 2.3 | 11.3 | 1.9 | 0.3 | 3.1 | 0.1 | 0.3 | 0 | 0 |
B井-1 | 2.16 | 38.8 | 50.0 | 0 | 0.5 | 3.1 | 0.2 | 0.5 | 6.5 | 0.1 | 0.3 | 0 | 0 |
B井-2 | 0.50 | 7.9 | 6.7 | 0 | 0.2 | 82.5 | 1.5 | 0.2 | 0.7 | 0.1 | 0.2 | 0 | 0 |
B井-3 | 1.70 | 46.2 | 41.3 | 0.3 | 0.7 | 2.1 | 0.2 | 0.7 | 8.0 | 0 | 0.5 | 0 | 0 |
B井-4 | 0.81 | 18.5 | 9.4 | 0 | 0.3 | 43.2 | 24.6 | 0.5 | 3.3 | 0 | 0.2 | 0 | 0 |
B井-5 | 0.95 | 24.2 | 13.0 | 0 | 0.5 | 49.6 | 6.7 | 0.8 | 4.8 | 0 | 0.4 | 0 | 0 |
B井-6 | 1.40 | 34.0 | 15.5 | 0.4 | 0.6 | 35.5 | 6.0 | 0.7 | 6.7 | 0.2 | 0.4 | 0 | 0 |
B井-7 | 0.79 | 25.3 | 13.1 | 0 | 0.3 | 49.3 | 7.5 | 0.3 | 3.8 | 0.1 | 0.3 | 0 | 0 |
B井-8 | 0.68 | 22.8 | 8.5 | 0 | 0.4 | 53.2 | 10.4 | 0.2 | 4.3 | 0 | 0.2 | 0 | 0 |
B井-9 | 1.65 | 40.2 | 26.9 | 0.5 | 0.8 | 20.6 | 3.3 | 0.4 | 6.8 | 0.1 | 0.4 | 0 | 0 |
B井-10 | 0.96 | 34.4 | 22.1 | 0 | 0.8 | 32.8 | 3.9 | 0.2 | 5.4 | 0 | 0.4 | 0 | 0 |
潭头-1 | 1.36 | 32.6 | 48.2 | 0.4 | 0.4 | 12.6 | 3.2 | 0.6 | 1.4 | 0.1 | 0.1 | 0 | 0.4 |
潭头-2 | 1.61 | 37.0 | 49.6 | 0.3 | 0.5 | 6.5 | 2.1 | 0.5 | 3.2 | 0.1 | 0.2 | 0 | 0 |
潭头-3 | 1.20 | 28.3 | 45.5 | 0.2 | 0.4 | 20.3 | 4.0 | 0.2 | 0.8 | 0.1 | 0.2 | 0 | 0 |
潭头-4 | 1.42 | 30.9 | 56.0 | 0.1 | 0.5 | 10.1 | 0.7 | 0.4 | 1.1 | 0.1 | 0.1 | 0 | 0 |
潭头-5 | 1.45 | 23.4 | 52.4 | 0.2 | 0.3 | 17.1 | 4.4 | 0.7 | 0.8 | 0.2 | 0.1 | 0 | 0.4 |
潭头-6 | 1.60 | 35.7 | 49.0 | 0.4 | 0.6 | 4.9 | 5.4 | 0.4 | 2.7 | 0.3 | 0.3 | 0 | 0.3 |
潭头-7 | 1.36 | 30.0 | 57.0 | 0.4 | 0.4 | 9.5 | 0.7 | 0.3 | 1.2 | 0.2 | 0.3 | 0 | 0 |
潭头-8 | 0.83 | 20.9 | 35.7 | 0.2 | 0.3 | 41.2 | 0.3 | 0.4 | 0.7 | 0.2 | 0.1 | 0 | 0 |
潭头-9 | 0.72 | 15.4 | 52.1 | 0 | 0.2 | 17.3 | 3.7 | 0.4 | 7.6 | 3.3 | 0 | 0 | 0 |
潭头-10 | 1.59 | 46.2 | 39.2 | 0.5 | 0.7 | 9.3 | 0.7 | 0.5 | 2.4 | 0.2 | 0.3 | 0 | 0 |
Table 2
Comparison of sedimentary characteristics between the shales in Guizhong area and in the Sichuan Basin[12,22,27-28]"
层系 | 四川盆地涪陵页岩层系 | 桂中坳陷页岩层系 | |
---|---|---|---|
层位 | 五峰组-龙马溪组 | 鹿寨组 | |
相 | 陆棚 | 台槽 | |
亚相 | 深水陆棚 | 台盆、下斜坡 | |
沉积物特征 | 岩石组成 | 黑色硅质页岩、炭质页岩、灰黑色粉砂质泥质页岩、 粉砂质灰质泥岩 | 灰黑色硅质页岩、灰质泥岩、炭质泥岩、 深灰色硅质灰岩和泥质灰岩 |
沉积构造 | 页理、水平层理、交错层理,黄铁矿结核、硅质结核, 眼球状构造等变形层理 | 水平纹层、页理,硅质、灰质与泥质滑动变形, 黄铁矿结核、燧石结核 | |
古生物 | 笔石、放射虫、硅质海绵 | 珊瑚、腕足、双壳,植物根茎 | |
沉积环境 | 水动力条件 | 弱,间歇性风暴 | 弱,浊流 |
水深 | 60 ~ 200 | 暂无数据 | |
黄铁矿发育情况 | 含量在1.0 % ~ 5.0 %,局部富集 | 含量在0.2 % ~ 14.7 %,富集 | |
氧化还原环境 | 还原环境 | 还原环境 | |
TOC/% | 2.0 ~ 11.0 | 0.6 ~ 7.1 | |
优质页岩层厚度/m | 37 ~ 76 | 20 ~ 60 |
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