石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (5): 1210-1222.doi: 10.11743/ogg20210518
收稿日期:
2020-08-12
出版日期:
2021-10-28
发布日期:
2021-10-26
作者简介:
谷宇峰(1988-), 男, 助理研究员, 储层表征和测井解释技术。E-mail: Yufeng Gu1(), Daoyong Zhang1, Zhidong Bao2
Received:
2020-08-12
Online:
2021-10-28
Published:
2021-10-26
摘要:
识别储层岩性是开展地层对比和沉积展布等地质基础研究工作的重要前提。致密砂岩储层多为砂、泥岩薄互层,形成的岩性不仅种类较多,而且大部分岩性的测井响应也较为相似,为相关的岩性识别工作带来了困难。基于机器学习技术在模式识别上具有强大的分析性能,选用了稳定性好且计算效率高的XGBoost模型来解决致密砂岩储层岩性识别问题。该模型在建模过程中需要较多的经验参数参与,且计算速度随着自变量的增加而逐渐降低,为此提出了采用CRBM模型和PSO模型对其进行改进。CRBM模型具备数据提取功能,可从源数据中挖掘出更少但更利于建模的新自变量,而PSO模型可通过迭代计算确定XGBoost所有经验参数的最优值。以姬塬油田西部长4+5段部分取心井资料为基础,通过设计两个实验来验证提出的混合模型的预测能力。为加强验证效果,在实验中加入了PNN和SVM的优化模型进行对比。实验后发现所提出模型的预测准确率最高,均在90%以上。实验结果表明所提出的模型不仅能有效解决致密砂岩储层岩性识别问题,且较以往经典预测模型更具推广应用性。
中图分类号:
表1
验证模型参数设置及优化结果"
PNN | SVM | XGBoost | |
初始参数(是否需要优化) | α=X(0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1)(是) | c=1 (是) 核函数=RBF(否) gamma=1 (是) | D=100 (是) η=0.01 (是) max_depth=3 (是) λ=0.1 (是) min_chile_weight=0.1 (是) δ=0 (是) 损失函数=交叉熵损失函数(否) |
PSO参数设定 | q=10 t=100 ωmax,ωmin=0.9, 0.4 c1, c2=1.5 r1和r2,范围[0, 1] | ||
各优化参数的σmax_1和σmax_2 | |||
α (10-2, 2×100) | c (10-3, 103) gamma (10-3, 103) | D (1020, 104) η (10-3, 100) max_depth (3×100, 101) λ (100, 102) min_chile_weight (100, 102) δ (100, 101) | |
各优化参数的Wmax | |||
α (0.1) | c (10) gamma (10) | D(50) η(0.1) max_depth(5) λ(10) min_chile_weight(10) δ(5) | |
优化后参数 | X=(0.85, 0.83, 0.91, 0.79, 0.98, 0.89, 1.01, 0.87) | c=15 gamma=2.5 | D=730 η=0.2 max_depth=5 λ=1.3 min_chile_weight=1.2 δ=0 |
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