Oil & Gas Geology ›› 2025, Vol. 46 ›› Issue (5): 1430-1445.doi: 10.11743/ogg20250504
• Petroleum Geology • Previous Articles
Chuang ER1,2(
), Hongbo GUAN1, Wei LIU3, Ni CHENG4, Jie BAI5, Chong HU6
Received:2025-08-02
Revised:2025-08-29
Online:2025-10-30
Published:2025-10-29
CLC Number:
Chuang ER, Hongbo GUAN, Wei LIU, Ni CHENG, Jie BAI, Chong HU. Impacts of terrigenous inputs on organic matter type: A case study of shales in the Chang 73 oil sub-group of the Triassic Yanchang Formation, Ordos Basin[J]. Oil & Gas Geology, 2025, 46(5): 1430-1445.
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Table 1
Lithofacies types of shales from the Chang 73 oil sub-group in four wells, Ordos Basin, and their implications for sedimentary settings"
岩相 类型 | 层状页岩 | 不连续-连续纹层状页岩 | 块状-不连续纹层含粉砂页岩 | 块状-不连续纹层粉砂质页岩 | 层状粉砂质页岩 | 纹层状粉砂质页岩 | 块状粉砂质页岩 |
|---|---|---|---|---|---|---|---|
| 显微结构特征 | 发育连续长英质纹层、黏土质纹层和块状结构等3种以上显微沉积构造,纹层厚度 > 1.0 mm | 以连续和不连续的长英质纹层与黏土质纹层为主,纹层厚度 < 1.0 mm | 以块状结构和不连续的长英质纹层和黏土质纹层为主,长英质含量低 | 以块状、不连续的长英质纹层和黏土质纹层为主,纹层厚度 < 1.0 mm,长英质含量偏高 | 发育长英质纹层、黏土质纹层和块状结构等3种以上显微沉积构造,层厚 > 1.5 mm,长英质含量高 | 发育连续的长英质纹层和黏土质纹层,纹层厚度 < 1.0 mm,纹层数量多,长英质含量偏高 | 无明显显微沉积构造,长英质含量高 |
| 沉积环境意义 | 水体安静,受重力流沉积影响,沉积分异明显 | 水体较安静,存在波动,受重力流沉积影响大 | 水体动荡性增加,受重力流沉积影响大,沉积分异作用弱 | 水体动荡性增加,受重力流沉积影响大,陆源输入增加,沉积分异作用弱 | 水体动荡,受重力流沉积影响大,陆源输入增加 | 水体安静,受重力流沉积影响大,陆源输入增加,沉积分异明显 | 水体动荡,陆源输入影响大,沉积分异不明显 |
| 陆源物质影响 | 弱 | 偏弱 | 偏强 | 强 | 强 | 强 | 强 |
| 腐泥组含量/% | |||||||
| 镜质组含量/% | |||||||
| 干酪根类型指数 | |||||||
| H269井 | - | - | + | ++ | ++ | + | + |
| HA87-1井 | + | - | + | + | - | + | - |
| ZU375井 | + | ++ | - | - | ++ | - | - |
| W336井 | ++ | + | + | + | + | + | + |
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