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Collaborating Authors
Relizane Province
Abstract The Algerian offshore area is located in the western mediterranean sea, East of alboran basin, and south of algero provencal basin. In geological perspective, it covers the area from the narrow continental shelf to the deep basin, water depth range from 0-2800m. Prospectivity is primarily associated with pre-messinian deposits, in addition to Pliocene. The seismic data consists mainly of 2D surveys, with relatively coarse coverage in addition to gravity and magnetic. The 2D seismic coverage acquired in 2011 (5000km) covers the main deep water area. The evaluation of the 2D seismic data has highlighted a number of significant leads with different sizes. They are related to different kind of traps (anticlines, faulted and tilted blocks, …). Only one deep well (4496.5m) and two core drills have been drilled. The onshore geological map reveals the extension toward the offshore of the Chelif basin. The petroleum potential of this onshore basin is proven since the 1940’s with the discoveries of Ain Zeft and Tliouanet oil fields. Reservoirs are expected to consist of sandstones related to Miocene, in addition to the Oligocene (Numidian flyshs) that can be found in the eastern part. The hydrocarbon potential interest in the eastern part could be enhanced by the positive discoveries in the Sicilian channel and also by the proven petroleum system of the Numidian in the onshore part of Tunisia and Algeria (Ain Regada).
anomaly, basin, Benabdelmoumen, continental shelf, internal report sonatrach, Khennaf, Miocene, Offshore, Petroleum Engineer, Pliocene, pre-messinian deposit prospectivity, Prospectivity, Reservoir Characterization, seismic data, sequence, spe 166569, subsurface interpretation, transect, Upstream Oil & Gas
Oilfield Places:
- Africa > Middle East > Algeria > Relizane Province > Chelif Basin > Tliouanet Field (0.94)
- Africa > Middle East > Algeria > Relizane Province > Chelif Basin > Ain Zeft Field (0.94)
SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
Thousands of kilometers of seismic reflection profiles, including deep seismic profiles, have been recently recorded in the Algerian offshore. Among this huge data base, two orthogonal profiles have been selected in the main depotcentre documented in the eastern part of the Algerian Basin, and used to update the structural model for both the Early Neogene rifting phase and subsequent Plio-Quaternary inversion operating along this currently active segment of the North African margin. For instance, the deep abyssal plain is still underlain by a thinned continental crust, Late Oligocene-Early Neogene (?) extension being controlled by the development of a narrow north-trending transtensional pull-apart basin. However, the southern part of the Algerian Basin has been subsequently inverted, both synrift series and pre-rift substratum being now locally exposed onshore within the Kabylides allochthon. As a whole, the deep Algerian offshore constitutes a foreland basin for the north-verging Plio-Quaternary thrusts imaged by recent seismic profiles beneath the continental slope, accounting for the south-ward dipping attitude of the Moho and east-trending attitude of the main Plio-Quaternary depotcentre, as expected for any thrust-related flexural basin. Because this frontier area remains almost unexplored in term of petroleum resources, with only a deep well (Habibas-1) in the west, and 2 shallow core-drills, Alger and Arzew, located west of Algiers, we have subsequently reviewed the potential and risk related to the various components of its petroleum systems. Assuming a realistic distribution of potential source rocks, a coupled kinematic-thermal and HC migration modelling has been performed along the north-trending profile, using the CERES code developed at IFP. The model results account for a very recent episode of HC generation and charge, most HC products being likely trapped beneath the Messinian salt.
Country:
- Europe (1.00)
- North America > Canada > Alberta > Woodlands County (0.25)
- Africa > Middle East > Algeria > Relizane Province (0.16)
Geologic Time:
- Phanerozoic > Cenozoic > Neogene > Miocene > Tortonian (0.71)
- Phanerozoic > Cenozoic > Neogene > Miocene > Aquitanian (0.69)
- Phanerozoic > Cenozoic > Neogene > Miocene > Messinian (0.53)
Oilfield Places:
- Europe > France > Aquitaine Basin (0.99)
- Africa > Middle East > Algeria > M'Sila Province > Hodna Basin > Oued Gueterini Field (0.97)
- Africa > Middle East > Algeria > Relizane Province > Chelif Basin > Tliouanet Field (0.94)
- (4 more...)
ABSTRACT: Cheliff basin is an intra-mountainous basin concealing two oil fields and hydrocarbon shows in Oligocene and Miocene reservoirs. The sedimentary cover consists mainly of marl deposits associated with limited sand bodies of lower and upper Miocene. Three main formations have been sampled through ten wells for geochemical evaluation, Oligocene, Middle and Upper Miocene. Although Oligocene is not widespread in the basin, it shows mean potential (type II, TOC=0.5− 1%) and a maturity level of an oil window (Tmax= 430− 455°C). The Middle Miocene marls does not have the characteristic of a source rock which could generate commercial quantities of hydrocarbon, because of the weak organic richness (TOC generally lower than 0.5 %) and the lack of preservation of the organic matter. The marls of upper Miocene have mean to good potential, the TOC range from 0.5 to 1.2 % with type II marine organic matter. However, they still immature in the analysed well, Tmax< 430°C. Nevertheless, if a kinetic model reveals a type II S kerogen (like Ain Zeft oils); this horizon could be considered as a mature source rock. The offshore is also studied through the only one well located near Habibas Islands (northern Oran). The Middle Miocene is mature whereas, the source rock potential is weak (TOC<0.5 %). The Upper Miocene is relatively rich (TOC>1%) but it still immature. The Ain Zeft heavy oil (high NSO, 23 ° API) located in the northern part of the basin is probably sourced from Messinian which is an hyper saline deposit. Tliouanet oils (light) were more likely generated from the basement, a higher maturity source rock (Cretaceous). The hydrocarbon generation from the Middle Miocene occurred at 13 my, 10 to 50 % of oil was expelled since 11 my. Using type II S kinetic model (assumption) for the upper Miocene, the model shows oil generation period of Pleistocene. There are similarities in terms of organo-facies and conditions of preservation of the organic matter between Cheliff basin and Offshore. For predicting prospective zones of potential source rock in Algerian-provincial basin, we need to study source rocks distribution and occurrence regarding the organic matter preservation and supply at a whole Mediterranean scale
basement, basin, Chelif Basin, computing parameter, demonstration well name, expulsion, geochemical characterization, middle miocene, Miocene, neogene basin, Offshore, Oligocene, organic matter, organic richness, Preservation, Reservoir Characterization, source rock, structural geology, type II, upper miocene, Upstream Oil & Gas
Country:
- Asia > Middle East > Yemen (0.93)
- Asia > Middle East > Saudi Arabia (0.93)
- Africa > Sudan (0.93)
- (4 more...)
Geologic Time:
- Phanerozoic > Cenozoic > Neogene > Miocene > Tortonian (1.00)
- Phanerozoic > Cenozoic > Neogene > Miocene > Messinian (1.00)
Oilfield Places:
- Africa > Middle East > Algeria > Relizane Province > Chelif Basin > Tliouanet Field (0.99)
- Africa > Middle East > Algeria > Relizane Province > Chelif Basin > Ain Zeft Field (0.99)
- South America > Bolivia > Beni Basin (0.97)
Algerian Offshore: New Data And Petroleum Plays
Addoum, B. (Sonatrach, Activite Amont, Division Exploration) | Slimane, M. (Sonatrach, Activite Amont, Division Exploration) | Benabdelmoumene, M.S. (Sonatrach, Activite Amont, Division Exploration) | Ghaffar, A. (Sonatrach, Activite Amont, Division Exploration) | Khennaf, N. (Sonatrach, Activite Amont, Division Exploration) | Seghir, S. Mohamed (Sonatrach, Activite Amont, Division Exploration)
ABSTRACT: The Algerian offshore represents the main southern part of the occidental Mediterranean basin. It extends from east to west over 1200 Km representing an area of 108,122.18 Km2 corresponding to the Alboran basin to the west and the Algero-provencal basin to the east. More than 20000 Km of old exclusive (1968–1977) and about 9000 km of non-exclusive seismic data show a possible petroleum interest relating to the Miocene formations in the western part and the Miocene and Oligocene (Numidian flysh) formations in the eastern part. The Spec-data has been acquired by WesternGeco during 2000 for the eastern part and during 2002 for the western part. In the western basin where only one dip well (4496.5m) and two core drills have been drilled, the onshore geological map reveals the extension toward the offshore of the Chelif basin. The petroleum potential of this onshore basin is of a great interest since the 1940's with the discoveries of Ain Zeft and Tliouanet as oil fields. The hydrocarbon potential interest in the eastern part could be enhanced by the positive discoveries in the Sicilian channel and also by the proved petroleum system of the Numidian in the onshore part in Tunisia and Algeria (Ain Regada). The results obtained from the interpretation of the new seismic lines could enhance the Petroleum's interest of the Algerian offshore.
SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
Abstract The North Algeria is an under explored petroleum province. Significant oil and gas shows have been encountered, and oil seeps are well known in the most part of the area. Oil has been extracted for the century in the Cheliff basin (Tliouanet and Ain Zeft fields). The first oil commercial discovery in Algeria on 1948 is noted in Oued Gueterini field in the Hodna basin and it's produce until present time. The North Algeria is in a geologically complex area encompassing the Offshore, Tellian atlas, Saharian atlas and constitute the zones of alpine age deformation. Although petroleum exploration in the northern foldbelt has been unsuccessfull; several wells were drilled on surface structure without seismic control and understanding the shifting structure in the subsurface, whereas others were not drilled deep enough to reach the deeper targets. The northern foldbelt area is expected to have a similar geodynamic and tectonic as the Apennines (Italia), the Zagros (Iran), which contains important oil and gas discoveries. The Offshore is a continental shelf with a tertiary and quaternary formation. The petroleum target is the mio-pliocene sands reservoirs, sourced from the messinian shales with a TOC values 0.56 to 2.60% at HBB–1 well in the occidental part. A new seismic have been acquired on 2000 by Western Geco shows a thick sedimentary deposit in the deep water zone with a variety of trapping styles related to the conventional anticline, faults, salt dome... In the Tellian atlas, two main basins are developed, the Cheliff in the west (mointain basin) and the Hodna in the central part (for deep basin). The petroleum system is proved on this basins by small fields and oil seeps from the miocene sands (shallow reservoirs). The cretaceous could be an important deep target no reached by wells. The upper miocene reservoir is charged from the messinian shales; the lower miocene reservoir sands and upper cretaceous carbonates are charged from the cretaceous shales and marls source rocks. In the saharian atlas which is an elongate trough between the saharian platform in the south and the Tellian atlas in the north, a potential basin is developed in the oriental part (south east constantine basin) where four oil fields and one gas field have been discovered in the cretaceous play. The north province could be a promising area for hydrocarbons exploration, detailled structural work based on adequate and high resolution seismic is needed to define the model and geometry of traps related to this complex area. BLOCK 1 - - FORUM 2 131 ALGERIA, NORTHERN FOLDBELT AND OFFSHORE AREA: A FUTURE HYDROCARBONS PROVINCE Introduction Northern Algeria is an under explored petroleum province. Significant oil and gas shows have been encountered and a number of small discoveries were made over 40 years ago (Oued Gueterini, Djebel Foua and Djebel Onk)
Country:
- Africa > Middle East > Algeria > M'Sila Province (0.35)
- Africa > Middle East > Algeria > Relizane Province (0.34)
- Africa > Middle East > Algeria > Northern Algeria (0.26)
Oilfield Places:
- Africa > Middle East > Algeria > Tébessa Province > Constantine Basin > Block 129 > Djebel Onk Field (0.99)
- Africa > Middle East > Algeria > Relizane Province > Chelif Basin > Tliouanet Field (0.99)
- Africa > Middle East > Algeria > Northern Algeria > Hodna Basin (0.99)
- (3 more...)
SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
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