Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (4): 1089-1105.doi: 10.11743/ogg20240414
• Petroleum Geology • Previous Articles Next Articles
Qin ZHANG1,2(), Donglian LU1, Kai WANG3, Chang LIU4, Mingqiang GUO5, Mengjie ZHANG1, Chaojie GUO1, Ying WANG1, Wenzhong HU1, Xiaomin ZHU1,2
Received:
2024-03-02
Revised:
2024-07-10
Online:
2024-09-05
Published:
2024-09-05
CLC Number:
Qin ZHANG, Donglian LU, Kai WANG, Chang LIU, Mingqiang GUO, Mengjie ZHANG, Chaojie GUO, Ying WANG, Wenzhong HU, Xiaomin ZHU. Lithofacies classification and microscopic pore characteristics of fine-grained sedimentary rocks in the Hetang Formation, Lower Yangtze region[J]. Oil & Gas Geology, 2024, 45(4): 1089-1105.
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Table 1
Mineral composition of fine-grained rocks in the Hetang Formation, Lower Yangtze region"
样品编号 | 全岩矿物组分含量/ % | 岩相类型 | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
黏土 矿物 | 文石 | 石英 | 钾长石 | 斜长石 | 方解石 | 白云石 | 黄铁矿 | 其他成分 | ||
WP10 1-1 | 29.8 | — | 68.8 | 0.1 | — | — | — | — | 1.3 | 块状含黏土硅质泥岩相 |
WP10 4-1 | 8.8 | — | 41.9 | 12.4 | 20.2 | — | 5.1 | 11.6 | — | 块状硅质泥岩相 |
WP11 4-1 | 3.9 | — | 93.8 | 0.5 | 0.3 | — | 0.3 | 1.2 | — | 块状硅质泥岩相 |
WP13 1-1 | 15.2 | — | 74.0 | 3.4 | 4.0 | — | 0.9 | 2.5 | — | 纹层状硅质页岩相 |
ZP3 3-1 | 21.3 | 1.8 | 28.5 | 2.6 | 7.4 | 7.7 | 30.0 | 0.3 | 0.4 | 块状硅/灰混合质泥岩相 |
ZP3 4-1 | 27.7 | — | 52.3 | 4.5 | 13.3 | 0.8 | 0.7 | — | 0.7 | 块状含黏土硅质泥岩相 |
ZP1 2-1 | 13.8 | 2.4 | 9.9 | — | 2.1 | 60.6 | 10.4 | 0.7 | 0.1 | 块状混合灰质泥岩相 |
Table 2
Clay mineral composition of the fine-grained rocks in the Hetang Formation, Lower Yangtze region"
样品编号 | 黏土矿物相对含量/ % | 混层比/% | TOC/ % | |||||
---|---|---|---|---|---|---|---|---|
高岭石 | 绿泥石 | 伊利石 | 伊/蒙 混层 | 绿/蒙 混层 | 伊/蒙 混层 | 绿/蒙 混层 | ||
WP10 1-1 | 1.9 | — | 93.0 | 5.1 | — | 10 | — | 2.12 |
WP10 4-1 | 12.1 | 3.4 | 69.6 | 14.9 | — | 45 | — | — |
WP11 4-1 | 1.1 | — | 93.3 | 5.6 | — | 10 | — | — |
WP13 1-1 | 4.6 | 35.0 | 45.7 | 7.0 | 7.7 | 10 | 20 | — |
ZP3 3-1 | 3.7 | 20.4 | 69.8 | 6.1 | — | 10 | — | 3.89 |
ZP3 4-1 | 3.0 | 7.4 | 65.4 | 12.7 | 11.5 | 10 | 30 | 2.08 |
ZP1 2-1 | 4.3 | 13.8 | 68.9 | 13.0 | — | 10 | — | 5.77 |
Table 3
Physical property data of fine-grained rocks in the Hetang Formation, Lower Yangtze region"
样品编号 | 样品长度/cm | 样品直径/cm | 岩石密度/ (g/cm3) | 孔隙度/ % | 垂直渗透率/ (10-3 μm2) | 岩相类型 |
---|---|---|---|---|---|---|
WP10 1-1 | 2.323 | 2.530 | 2.228 | 14.917 | 0.042 80 | 块状含黏土硅质泥岩相 |
WP10 4-1 | 2.752 | 2.545 | 2.415 | 3.307 | 0.007 64 | 块状硅质泥岩相 |
WP11 4-1 | 2.472 | 2.524 | 2.405 | 2.105 | 0.006 28 | 块状硅质泥岩相 |
WP13 1-1 | 2.841 | 2.536 | 2.286 | 14.913 | 0.035 70 | 纹层状硅质页岩相 |
ZP3 3-1 | 3.381 | 2.470 | 2.026 | 25.517 | 0.775 00 | 块状硅/灰混合质泥岩相 |
ZP1 2-1 | 1.924 | 2.531 | 2.679 | 1.772 | 0.007 10 | 块状混合灰质泥岩相 |
Table 4
N2 and CO2 isothermal adsorption experiment-derived pore structure parameters of fine-grained rocks in the Hetang Formation, Lower Yangtze region"
样品编号 | 岩相 | N2孔隙结构 | CO2孔隙结构 | ||||
---|---|---|---|---|---|---|---|
BET孔隙比表面积/(m2/g) | BJH累计孔隙比表面积/(m2/g) | 总孔隙体积/(cm3/g) | DFT孔隙比表面积/(m2/g) | DR孔隙比表面积/(m2/g) | 总孔隙体积/(cm3/g) | ||
WP10 1-1 | 块状含黏土硅质泥岩相 | 15.758 7 | 11.449 4 | 0.020 882 0 | 12.159 0 | 10.909 2 | 0.002 100 0 |
WP10 4-1 | 块状硅质泥岩相 | 6.493 9 | 5.603 0 | 0.006 837 0 | 20.682 0 | 22.760 6 | 0.004 460 0 |
WP11 4-1 | 块状硅质泥岩相 | 7.121 3 | 6.115 4 | 0.007 504 0 | 21.742 0 | 21.163 4 | 0.004 570 0 |
ZP1 2-1 | 块状混合灰质泥岩相 | 1.305 0 | 1.511 5 | 0.002 780 0 | 5.945 0 | 7.111 6 | 0.001 000 0 |
ZP3 3-1 | 块状硅/灰混合质泥岩相 | 11.263 7 | 9.049 4 | 0.012 775 0 | 11.700 0 | 9.384 7 | 0.002 090 0 |
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