Petrophysical Regression regarding Porosity, Permeability, and Water Saturation Driven by Logging-Based Ensemble and Transfer Learnings: A Case Study of Sandy-Mud Reservoirs

Figure 6

Correlations of applied well logs (a), variables extracted by continuous restricted Boltzmann machine (CRBM) (b), and variables gained by principal component analysis (PCA) (c). AC = acoustic log; CNL = compensated neutron log; DEN = density log; GR = gamma ray; SP = spontaneous potential; PE = photoelectric absorption cross-section index; AT10, AT20, AT30, AT60, and AT90 = resistivity of formation measured by array induction log at 10-inch, 20-inch, 30-inch, 60-inch, and 90-inch logging depth; CV1 to CV6 are variables extracted by CRBM; PV1 to PV6 are variables produced by PCA.

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