Title: Depositional Environments and Internal Architecture of Oligo-Miocene Gas Reservoirs, Cyprus
Speaker: Juan Gomez
Time: 11:30am - 1pm
Location: Chevron, 1400 Smith, 50th Floor, Room 50092
Depositional Environments and Internal Architecture of Oligo-Miocene Gas Reservoirs, Cyprus
The Aphrodite Field, discovered offshore Cyprus in 2012 and appraised through subsequent wells in 2013 and 2023, represents a major gas accumulation in the Levant Basin. Appraisal results indicate significant stratigraphic and architectural complexity, with reservoir compartmentalization identified as a key subsurface uncertainty. To reduce this uncertainty, the latest appraisal well acquired an integrated dataset including advanced wireline logs, fluid samples, and whole core through the D Sand interval. These data were combined with seismic interpretation and regional analogs to refine depositional environment, reservoir connectivity, and dynamic development assumptions.
Reservoir characterization applied a hierarchical deep-water stratigraphic framework using elements, complexes, and complex sets to describe the Oligo-Miocene reservoir architecture. The younger Tamar-equivalent C/B/A sand complexes and the overlying Levant mudstone form an upper complex set interpreted as lower-slope to basin-floor, unconfined distributary lobe deposits of Early Miocene age. The C Sand contains approximately 60% of field resources, whereas the B Sand is absent or locally pinched out and the A Sand is interpreted as distal.
The older D Sands contain approximately 40% of field resources and record a more confined, higher-gradient depositional system. The D2 Lower interval is interpreted as spatially confined slope-valley, leveed-channel, or channel-bypass deposits that transition upward into broader, weakly confined channel complexes in the D2 Upper. The D1 Sand comprises lower, middle, and upper complexes separated by thin mudstones, with the lower complex interpreted as channel bypass and the middle to upper complexes interpreted as weakly confined channels. Regional mudstone complexes, including the CD Shale, D1-2 Shale, and D2 Shale, provide important stratigraphic datums for correlation across an erosive and heterogeneous interval.
Whole core from the CD Shale and D1-D2 Upper interval provides the first D Sands core description in the Levant Basin. Core observations include coarse-grained erosive bases, upward-fining Bouma-style turbidites, dewatering structures, hybrid event beds, linked debrites, and common sand injections, supporting rapid sedimentation and variable confinement. Integration of seismic, logs, core, and analog data changed depositional interpretations from dominantly unconfined to more confined architectures, directly influencing static modeling, connectivity prediction, and field development planning.
Speaker:
Juan Gomez
Bio: Juan Gomez is a geoscientist with 20 years of industry experience spanning Shell, Noble Energy, and Chevron. He holds a B.S. in Petroleum Engineering from the University of Texas at Austin and has worked across exploration, appraisal, and development in a variety of geoscience and petrophysics roles. His experience includes the Gulf of Mexico, South America, West Africa, Canada, and several major U.S. onshore basins. Most recently, his work has included the Aphrodite Field in Cyprus and the Eastern Mediterranean. Outside of work, Juan is a husband and father of five who enjoys serving and mentoring others, coaching, camping, hiking, fishing, and snorkeling."
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