基于沉积微相特征挖掘的随机森林岩石相测井识别方法——以新场地区须家河组二段致密砂岩为例

何小龙, 张兵, 杨凯, 何一帆, 李琢

A log-based lithofacies identification method based on random forest and sedimentary microfacies characteristics:A case study of tight sandstones in the second member of the Xujiahe Formation in the Xinchang area

HE Xiao-Long, ZHANG Bing, YANG Kai, HE Yi-Fan, LI Zhuo

图2 川西坳陷须二段岩石相典型沉积构造
a—XC7井(T₃x^2-3),透镜体软沉积变形; b—GM3井(T₃x^2-1),沙纹层理;c—ZJ20井(T₃x^2-3),后积层理;d—ZJ20井(T₃x^2-1),平行层理;e—ZJ20井(T₃x^2-1),槽状交错层理;f—GM3井(T₃x^2-1),块状层理;g—GM3井(T₃x^2-3),泥砾;h—CF563井(T₃x^2-1),碳屑;i—XC8井(T₃x^2-3),平行层理“酥饼缝”;j—GM3井(T₃x^2-3),板状交错层理“酥饼缝”
a—well XC7(T₃x^2-3),soft deposition deformation of lens body;b—well GM3(T₃x^2-1),sandprint bedding;c—well ZJ20井(T₃x^2-3),retrogradation bedding;d—well ZJ20(T₃x^2-1),parallel bedding;e—well ZJ20(T₃x^2-1),trough cross bedding;f—well GM3(T₃x^2-1),massive bedding;g—well GM3(T₃x^2-3),mud gravel;h—well CF563(T₃x^2-1),charcoal;i—well XC8(T₃x^2-3),parallel layer "puff pastry seam";j—well GM3(T₃x^2-3),plate shaped cross bedding "puff pastry seam"

Fig.2 Typical sandstone sedimentary structure of the second member of Xujiahe Formation in the Western Sichuan depression