Prospect Characterization of the First 3D Seismic Offshore Cyprus And Lebanon

Lie, Øystein (Petroleum Geo-Services) | Skiple, Cecilie (Petroleum Geo-Services) | Trayfoot, Mark (Petroleum Geo-Services)


Summary The first 3D seismic data in the deep water offshore Cyprus and Lebanon have been acquired, processed and interpreted. Despite the lack of exploration well data a] consistent chronostratigraphic framework has been built across Cyprus and Lebanon and implications for prospectivity assessed. Several petroleum systems were identified, and potential prospect types include four-way dip closure structures and stratigraphic traps. Direct hydrocarbon indicators including amplitude and frequency anomalies are associated with many of the identified prospects. Amplitude maps have been extracted on offset stacks, and a good correlation between amplitude anomalies and the closures was found. The recent 3D seismic is considered to reduce the exploration risk in this unexplored frontier area. Introduction The offshore areas of Cyprus and Lebanon in the eastern Mediterranean Sea are currently unexplored with respect to hydrocarbon resources. The first 3D seismic surveys were acquired to obtain an improved understanding of the geological structures and the petroleum potential in these frontier deep water areas. The regional tectonostratigraphic framework of the area is influenced by the relative movements of three adjacent continental tectonic plates; the African plate to the south, the Arabian plate to the east and the Anatolian sub-plate to the north. The Levantine Basin, containing up to 10km of Mesozoic- Cenozoic sediments is situated on the north-east edge of the African plate. The basin is bounded to the north by theLatakia Ridge (LR), part of the Cyprus deformation zone (Hall et al.2005), to the west by the Eratosthenes Seamount (ES) and to the south by the Nile Delta Cone (NDC) (Figure 1). Two areas considered highly prospective were selected for acquisition of the 3D seismic data. The surveys were acquired late 2006/early 2007 and cover approximately 1550km² (Phase 1 to the south) and 1350km² (Phase 2 to the north) (Figure 1). Phase 1 covers the central part of the Levantine Basin. Phase 2 covers the northern part of the basin, the Latakia Ridge, and several other large Syrian and Cyprus-Arc deformation folds. The pre-stack time migrated 3D seismic data sets have a high signal to noise ratio and a very high reflectivity at both shallow and deeper levels. Although no exploration wells have yet been drilled offshore Cyprus and Lebanon, valuable information can be extracted from some excellent geological exposures and data from seven Lebanese onshore exploration wells (Walley, 1998). Analogues can also be drawn from the proven hydrocarbon producing provinces of the Nile Delta, North Sinai, Gaza and Israel. ES Seismic interpretation and hydrocarbon plays Nine key regional horizons have been interpreted to evaluate the prospectivity of the area. By tying the key reflectors from Cyprus in the west to Lebanon in the east a consistent chronostratigraphy was established. The following horizons were interpreted; Seabed, Intra Pliocene, Base Pliocene, Base Messinian Evaporite, Upper Miocene, Mid Miocene, Base Miocene, Eocene Unconformity and Senonian Unconformity (Figure 2). The area contains a number of potential hydrocarbon plays and a variety of structural and stratigraphic trapping styles exist.

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