岩性油气藏 ›› 2026, Vol. 38 ›› Issue (1): 5566.doi: 10.12108/yxyqc.20260105
殷疆1(
), 焦雪君2, 李小龙3, 李泰福4, 申战勇4, 李梦茜5, 孙睿1, 朱玉双1(
)
YIN Jiang1(
), JIAO Xuejun2, LI Xiaolong3, LI Taifu4, SHEN Zhanyong4, LI Mengxi5, SUN Rui1, ZHU Yushuang1(
)
摘要:
为了解决低阻油藏传统电法测井含油饱和度解释困难的问题,提出了一种基于随机森林优化算法的低电阻率储层含油饱和度评价方法,并应用于鄂尔多斯盆地环庆地区侏罗系延安组低阻储层中。研究结果表明:①基于随机森林回归算法建立含油饱和度解释模型,引入克拉克星鸦算法(NOA)优化随机森林超参数寻优过程,综合利用岩心和测井资料,经机器自学习训练,建立新的模型(NOA-RF)。②NOA方法加快了随机森林模型的训练速度,集中寻得全局最优超参数组合用时26.17 min,相比传统网格法的耗时缩短了36.18 min,且提升了含油饱和度模型的拟合精度(96.6%),优于传统网格搜索法(83.9%)和Archie法(45.2%)的精度。③利用NOA-RF模型预测的环庆地区低阻储层的含油饱和度与岩心实际含油饱和度相关系数达0.977 9,油水层识别的准确率为93.33%,比传统Archie法的准确率高53.33%。
中图分类号:
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