Béjaïa Province

Collaborating Authors

Béjaïa Province

New Insights into the Petroleum Systems of the Algerian Offshore Basin

OnePetroSeptember, 2021

Abstract The Algerian offshore area is located in the western Mediterranean Sea, East of the Alboran basin, and south of the Algero-provencal basin. Geologically, it covers the area from a narrow continental shelf to the deep basin, water depth ranging from 0-2800m. Even if the exploration started during the sixties, the data consists mainly of 2D seismic, in addition to gravity and magnetic; this area is under-explored. The exploration activity has increased during the last two decades by acquiring more than 14000km of 2D seismic and 7000km of 3D Broadseis data. The 2D seismic program acquired between 2000 and 2011 is good and becomes poor where the messinian salt layer is structurally complex. The high quality of the 3D broadseis shows a higher resolution and a good improvement for the deep geologic events pre-salt layer, by applying modern processing sequences that focuses on noise and multiples attenuation, especially internal multiples. The depth imaging has helped to identify potential targets for exploration, including anticlinal structures, faulted and tilted blocks, carbonate build-up and channels. They may have favourable timing to be charged from pre and Miocene source rocks. The stratigraphic study of HBB-1 well identified three reservoirs showing significant sand intervals in the Miocene (Serravallian) and in the Pliocene. The interpretation of the seismic data has also allowed the identification of three sedimentary areas with distinct sub-basins fill: The Bejaia-Bougaroune basin, the Algiers basin, the Mostaganem- Tenes basin, and Habibas basin into extreme West. Evaluation of the 2D and 3D seismic data has highlighted several leads and plays that exist at various stratigraphic levels even though a working petroleum system still remains unproven. Introduction The Algerian offshore covers an area of approximately 130000 km. Exploration activity was first commenced in sixties. The basin is a frontier area of pre-salt exploration, with only one deep well and two core drills drilled on the shelf. This study integrates information from new seismic data to improve the understanding of the petroleum systems.

OnePetro

OMC

OMC-2021-230

OMC Med Energy Conference and Exhibition

Algerian Offshore, Algerian Offshore Basin, algiers basin, basin, Exhibition, exploration, mostaganem-tene basin, multiple attenuation, new insight, oligo-miocene, petroleum system, Prospectivity, quaternary sediment, Reservoir Characterization, seismic data, source rock, trap style, Upstream Oil & Gas

Country:

Europe (0.92)
Africa > Middle East > Algeria > Béjaïa Province > Bejaia (0.28)
Africa > Middle East > Algeria > Mostaganem Province > Mostaganem (0.27)

Geologic Time: Phanerozoic > Cenozoic > Neogene > Miocene > Serravallian (0.35)

Geophysics:

Geophysics > Seismic Surveying > Surface Seismic Acquisition (1.00)
Geophysics > Seismic Surveying > Seismic Processing (1.00)

Industry: Energy > Oil & Gas > Upstream (1.00)

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

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Available Data and Petroleum Interest of the Algerian Offshore Basin

Khennaf, N. (Sonatrach Exploration) | Laddada, A. (Sonatrach Exploration)

OnePetroMarch, 2013

ABSTRACT The Algerian offshore is situated in the southern part of Western Mediterranean sea. From East to the West, It extends over 1200 Km with an area of 93500 Km2, corresponding to the basins of Alboran into the West and Algero-Provencal into the center and the East. The exploration of the Algerian offshore began during the sixties, with a 2D seismic acquisition concentrated mainly on bays. Currently, a volume of about 34.500 km of 2D seismic is available. In 2011, more than 5000 Km were acquired, in addition to the gravity and magnetic data. One deep well (HBB-1; 4496.5m) and two cores drill (ARZ-1; 1304m and ALG-1; 1205m) were drilled in the Algerian offshore which still under explored. The interpretation of the HBB-1 well data shows the possibility of existence of petroleum system; with source rock related to Miocene (TOC could reach 1.5%). Concerning the reservoirs, HBB-1 well crossed 03 interesting sandy levels with good porosities (5–18%) within the Miocene and lower Pliocene highlighted on Gamma Ray and Sonic logs. Other reservoirs could be interesting and are related to the Numidian sandstones which exist to the Eastern part. The messinian evaporitic sequence could be a regional seal in addition to the interbedded clays and marls. The interpretation of all the seismic data, let to establish different structural maps, with several area of interest. The first one is situated in Eastern part between Béjaia and Annaba, and the second one is situated in the Western part between Mostaganem and Ténès. Different kind of traps (anticlines, faulted and tilted blocks) have been identified on the seismic lines acquired in 2000 and 2002. The well definition of the traps will be possible with a detailed 3D seismic acquisition in order to plan a new exploration well in the Algerian offshore basin.

OnePetro

OMC

OMC-2013-029

Offshore Mediterranean Conference and Exhibition