In this study, a seismic-sedimentology workflow was implemented to improve facies and reservoir interpretation in ultradeep Cambrian carbonate platform-basin system. The thick (>1,200 m), mostly dolomitized carbonates in the study area were divided to six third-order sequences. Four vertical seismic facies are closely related to unique seismic-geomorphologic (landform) zones, revealing a transition from platform interior, platform margin, to slope and basin. The core and outcrop data supported the interpretation. The use of −90°, relative impedance 3D seismic data and frequency-fusion technique on stratal slices was the key to recognize and map deepwater slope fan and basin-floor fan facies that could become new exploration targets in the basin.

Note: This paper was accepted into the Technical Program but was not presented at the 2020 SEG Annual Meeting.

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