Xinjiang Petroleum Geology ›› 2025, Vol. 46 ›› Issue (1): 121-126.doi: 10.7657/XJPG20250115
• APPLICATION OF TECHNOLOGY • Previous Articles
MU Qian(), LI Gaoren(
), ZHANG Wenjing, CHI Ruiqiang
Received:
2024-04-30
Revised:
2024-06-14
Online:
2025-02-01
Published:
2025-01-24
CLC Number:
MU Qian, LI Gaoren, ZHANG Wenjing, CHI Ruiqiang. Effectiveness Evaluation of Tight Sandstone Reservoirs Based on NMR Logging[J]. Xinjiang Petroleum Geology, 2025, 46(1): 121-126.
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Table 1.
Evaluation of reservoir effectiveness using NMR logging data for the Chang 8 member in the Zhijing-Ansai area, Ordos Basin"
储集层 类型 | 核磁共振T2谱 | 三类孔占比 | 小孔 占比/% | 中孔 占比/% | 大孔 占比/% | 横向弛豫 时间/ms | 核磁孔隙 三组分指数 | 特征描述 |
---|---|---|---|---|---|---|---|---|
Ⅰ类 储集层 | | | <20 | >40 | >30 | 2.0~3 000.0 | >30 | 双峰分布,第二峰值大于第一峰值,核磁总孔隙度大于10% |
Ⅱ类 储集层 | | | 10~30 | 30~50 | 20~30 | 0.3~1 000.0 | 10~30 | 双峰分布为主,第二峰值略大于第一峰值,核磁总孔隙度为7%~10% |
Ⅲ类 储集层 | | | >30 | <40 | <20 | 0.3~500.0 | <10 | 单峰分布为主,少数双峰,第二峰值远小于第一峰值,核磁总孔隙度小于7% |
Table 2.
Pore throat characteristics for the Chang 8 and Chang 9 members in the Zhijing-Ansai area, Ordos Basin"
地层 | 储集层类型 | 小孔占比/% | 中孔占比/% | 大孔占比/% | 孔喉半径/μm | 孔隙类型 | 孔喉半径指数 |
---|---|---|---|---|---|---|---|
长8段 | Ⅰ类储集层 | <20 | 30~50 | >40 | 0.01~10.00 | 大孔 | >0.03 |
Ⅱ类储集层 | 20~35 | 30~50 | 20~40 | 0.01~1.00 | 中孔 | 0.02~0.03 | |
Ⅲ类储集层 | >35 | 30~50 | <40 | 0.01~0.30 | 小孔 | <0.02 | |
长9段 | Ⅰ类储集层 | <50 | <45 | >10 | 0.01~10.00 | 大孔 | >0. 20 |
Ⅱ类储集层 | 50~60 | >40 | <10 | 0.01~1.00 | 中孔 | 0.10~0.20 | |
Ⅲ类储集层 | >60 | <35 | <5 | 0.01~0.30 | 小孔 | <0.10 |
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