Oil & Gas Geology ›› 2021, Vol. 42 ›› Issue (6): 1334-1343.doi: 10.11743/ogg20210608
• Petroleum Geology • Previous Articles Next Articles
Tingbin Sun1(), Chengyan Lin2, Ling Wang1
Received:
2020-06-16
Online:
2021-12-28
Published:
2021-12-16
CLC Number:
Tingbin Sun, Chengyan Lin, Ling Wang. Microscopic formation mechanisms and distribution patterns of remaining oil in the marine clastic reservoirs of the Carboniferous, Tarim Basin[J]. Oil & Gas Geology, 2021, 42(6): 1334-1343.
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Table 1
Micropore texture types of the Carboniferous A reservoir, Tarim Basin"
类型 | 毛管压力曲线参数 | 铸体薄片图像分析 | 类型占比/% | 岩性 | ||||
孔喉半径/μm | 渗透率/(10-3 μm2) | 孔隙直径/μm | 喉道直径/μm | |||||
Ⅰ(粗喉) | Ⅰg(高渗) | >10 | >500 | >95 | >35.0 | 3.5 | 中砂岩 | |
Ⅱ(中喉) | Ⅱg(高渗) | 5 ~ 10 | > 500 | 75 ~ 95 | 28.0 ~ 35.0 | 17.0 | 细砂岩 | |
Ⅱz(中渗) | 5 ~ 10 | 50 ~ 500 | 67 ~ 75 | 25.0 ~ 28.0 | 37.6 | 细砂岩 | ||
Ⅲ(细喉) | Ⅲz(中渗) | 1 ~ 5 | 50 ~ 500 | 64 ~ 67 | 23.5 ~ 25.0 | 28.9 | 细砂岩 | |
Ⅲd(低渗) | 1 ~ 5 | 10 ~ 50 | 58 ~ 64 | 20.5 ~ 23.5 | 9.6 | 粉砂岩 | ||
Ⅲtd(特低渗) | 1 ~ 5 | 1 ~ 10 | 48 ~ 58 | 17.5 ~ 20.5 | 1.9 | 粉砂岩 | ||
Ⅳ(微细喉) | Ⅳtd(特低渗) | <1 | 1 ~ 10 | <48 | <17.5 | 1.3 | 粉砂岩 |
Table 2
Parameter statistics for remaining oil experiments in the Carboniferous A reservoir, Tarim Basin"
实验类型 | 样品及参数 | 实验条件 | ||||||
样品编号 | 岩性 | 渗透率/(10-3μm2) | 孔隙结构 | 温度/℃ | 围压/MPa | 实验用油 | ||
水驱过程的CT扫描检测 | CT-1 | 细砂岩 | 154.0(液测) | ⅡZ | 50 | 5.5 | 用实际井口原油,按照地层原油粘度进行配比 | |
CT-2 | 细砂岩 | 65.6(液测) | ⅢZ | |||||
水驱后含油薄片观察 | SQY-1 | 细砂岩 | 144.9(气测) | ⅡZ | 100 | 39.0 ~ 41.0 | 实际井口原油加天然气,按照地层原油粘度配比 | |
SQY-2 | 细砂岩 | 471.8(气测) | ⅡZ | |||||
SQY-3 | 细砂岩 | 475.1(气测) | ⅡZ | |||||
SQY-4 | 细砂岩 | 279.0(气测) | ⅡZ | |||||
SQY-5 | 细砂岩 | 26.0(液测) | ⅢZ | 100 | 39.0 | |||
微观刻蚀模型驱油 | FZ-1 | — | — | Ⅰg | 100 | 30.0 ~ 35.0 | 煤油 | |
FZ-2 | — | — | Ⅱg | |||||
FZ-3,FZ-4,FZ-5 | — | — | Ⅱz | |||||
FZ-5,FZ-5 | — | — | Ⅲz |
Table 3
Formation mechanisms and distribution patterns of remaining oil in the Carboniferous A reservoir, Tarim Basin"
剩余油形成机理 | 驱替液波及效率 | 机理分析 | 分布模式 | 剩余油分布模式及特征 | 比例/ % |
突进分隔作用 | 波及效率高 | 孔内分散油珠分散分布 | 10.1 | ||
剥离作用 | 波及效率中等 | 孔内半饱和状分散分布 | 55.3 | ||
毛细管绕流作用 | 未波及/ 弱波及 | 孔内饱和状斑状和片状富集 | 21.0 | ||
油润湿捕获作用 | 波及效率高 | 孔内膜状零散分布 | 4.8 | ||
角隅捕获作用 | 波及效率高 | 孔内角状星点状分布 | 3.0 | ||
细喉道捕获作用 | 波及效率中等 | 喉道夹持油滴状星点状分布 | 3.8 |
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