MReX identified gas and oil zones despite OBM invasion Challenges • Low-porosity, low-permeability sand reservoir with mud/oil contamination • Deep OBM invasion • OBM-contaminated signals distributed across the measured interval requiring isolation of the formation’s actual oil zones Results • Produced accurate fluid identification plots • Obtained accurate porosity measurements • Identified gas and oil reserves A major offshore operator in the East China Sea wanted to identify the oil and gas zones in a low-porosity, low-permeability sand reservoir with significant mud/oil invasion. The operator drilled a well with oil-based mud (OBM) with 12 1/4-in. and 8 1/2-in. borehole sections. In order to reduce risks, the mud density needed to be high, which resulted in a deeper

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