基于机器学习的鄂尔多斯盆地陇东地区长7段岩相测井识别方法

doi:10.13809/j.cnki.cn32-1825/te.2023.04.015

Abstract

Abstract:

Lithofacies analysis serves as the foundation for reservoir evaluation. However, due to the limited coring quantity and cost constraints, identifying lithofacies using logging data for uncored wells becomes crucial. In the Longdong area of the Ordos Basin, the lithofacies of the Chang-7 member have been classified into six types dependent on core identification results and imaging logging data. Based on core calibration, the logging response characteristics of different lithofacies were summarized, leading to the establishment of the lithofacies recognition mode using conventional logging curve. To achieve automatic lithofacies recognition in the study area, machine learning algorithms were employed. The traditional classification algorithms were affected significantly by the unbalanced sample. After comparing the application effects of different unbalanced data classification algorithm in the region, it’s found that bagging algorithm of ensemble learning notably improved the classification performance of all lithofacies by combining multiple classifiers. As a result, the overall lithofacies identification precision of this region has been improved by 20 %. According to the regional application results, the identification accuracy of single well can reach 84.33 %, demonstrating its practical applicability and effectiveness.

Key words: logging response characteristics, lithofacies, unbalanced data, classification, Chang-7 member in Longdong area

CLC Number:

TE122

SHEN Li,WANG Caizhi,NING Congqian,LIU Yingming,WANG Hao. Well-log lithofacies classification based on machine learning for Chang-7 member in Longdong area of Ordos Basin[J].Petroleum Reservoir Evaluation and Development, 2023, 13(4): 525-536.

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岩相类型	样本数/个	岩相类型	样本数/个
均质砂岩	1 848	粉砂质泥岩	6 634
非均质砂岩	6 331	黑色页岩	2 585
暗色泥岩	3 369	凝灰岩	487

欠采样方法	岩相样本数/个
欠采样方法	均质砂岩	非均质砂岩	暗色泥岩	粉砂质泥岩	黑色页岩	凝灰岩
不采样	1 290	4 429	2 322	4 657	1 843	336
随机欠采样	336	336	336	336	336	336
OSS	1 157	3 640	2 100	4 393	860	336
ENN	786	2 971	1 219	3 134	1 564	336
NCR	1 021	3 795	1 828	4 144	1 723	336
随机过采样	4 657	4 657	4 657	4 657	4 657	4 657
SMOTE	4 657	4 657	4 657	4 657	4 657	4 657
ADASYN	1 290	4 429	2 322	4 657	1 843	4 683
Borderline- SMOTE	4 657	4 657	4 657	4 657	4 657	4 657

序号	井名	岩心标定/个	模型识别/个	准确率/%
1	L34	877	723	82.44
2	L43	828	669	81.74
3	L49	1 029	832	80.86
4	L55	836	669	81.04
5	L97	1 294	1 071	82.79
6	T38	957	767	80.19
7	N196	855	721	84.33
8	M139	861	708	82.22
9	M160	935	749	83.15
10	L303	880	725	82.44

Well-log lithofacies classification based on machine learning for Chang-7 member in Longdong area of Ordos Basin

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