Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (5): 1305-1320.doi: 10.11743/ogg20240508
• Petroleum Geology • Previous Articles Next Articles
Hong ZHANG1(), Youliang FENG1, Chang LIU1, Zhi YANG1, Kunyu WU2, Guohui LONG2, Jianhuan YAO3, Bowen MENG1, Haoting XING2, Wenqi JIANG4, Xiaoni WANG1, Qizhao WEI1
Received:
2024-03-06
Revised:
2024-10-08
Online:
2024-10-30
Published:
2024-11-06
CLC Number:
Hong ZHANG, Youliang FENG, Chang LIU, Zhi YANG, Kunyu WU, Guohui LONG, Jianhuan YAO, Bowen MENG, Haoting XING, Wenqi JIANG, Xiaoni WANG, Qizhao WEI. Dominant lithofacies and factors controlling reservoir formation of the shale sequence in the upper member of the Paleogene Lower Ganchaigou Formation, Ganchaigou area, Qaidam Basin[J]. Oil & Gas Geology, 2024, 45(5): 1305-1320.
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Table 1
Qualitative to semiquantitative identification results of micro- to nano-scale matrix pore systems in different lithofacies of the E32 in well CP2, Ganchaigou area"
岩相类型 | 孔隙类型 | 高分辨率 扫描电镜图像 | 基质孔隙系统 (扫描电镜图像孔隙提取) | 大面积视域统计孔径 分布情况 | 面孔率/ % | 孔径分布/nm | 峰值 孔径/nm |
---|---|---|---|---|---|---|---|
块状灰云岩 (埋深 2 755.44 m) | 晶间孔 粒间溶孔粒内溶孔 | 5.83 | 11.00 ~ 1 088.00 (85.00) | 181.09 | |||
454.29 | |||||||
层状灰云岩 (埋深 2 749.10 m) | 晶间孔 粒内溶孔 | 4.50 | 11.02 ~ 1083.93 (302.67) | 302.67 | |||
断续状水平层理混积岩(埋深 2 752.29 m) | 粒间残余孔 粒内溶孔 | 2.14 | 11.00 ~ 952.00 (52.00) | 181.09 | |||
纹层状 混积岩 (埋深 2 759.94 m) | 粒间残余孔 粒内溶孔 | 3.07 | 11.00 ~ 679.00 (51.00) | 181.09 |
Table 2
Statistics of nitrogen adsorption experiment-derived fractal dimensions of reservoirs of different lithofacies in the E32, Ganchaigou area"
岩相 | 样品编号 | 微孔 | 中孔+宏孔 | 分形维数平均值 | ||
---|---|---|---|---|---|---|
D1 | R2 | D2 | R2 | |||
块状灰云岩 | CP2-6 | 1.993 7 | 0.948 5 | 2.602 4 | 0.995 7 | 2.298 1 |
层状灰云岩 | CP2-4 | 2.008 6 | 0.955 6 | 2.607 5 | 0.991 6 | 2.308 1 |
纹层状混积岩 | CP2-21 | 1.870 7 | 0.943 6 | 2.640 8 | 0.997 9 | 2.255 8 |
断续状水平层理混积岩 | CP2-11 | 2.266 1 | 0.982 7 | 2.579 4 | 0.992 9 | 2.422 8 |
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