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Guzman, Alfredo E. (Pemex Exploración y Producción, México) | Aquino, Jose A. (Pemex Exploración y Producción, México) | Ruiz, Jose M. (Pemex Exploración y Producción, México) | Flores, Marcos A. (Pemex Exploración y Producción, México) | Garcia, Jesus H. (Pemex Exploración y Producción, México)
PEMEX DISCOVERIES OF NEW OIL BENEATH THE CANTARELL FIELD, OFFSHORE CAMPECHE, MÉXICO Alfredo E. Guzmán, Pemex Exploración y Producción, México José A. Aquino, José M. Ruiz, Marcos A. Flores, Jesús H. García. Abstract The Cantarell Field, discovered in 1976, is one of the largest oil fields in the world and the largest one offshore. It is located on the continental shelf in the southern part of the Gulf of Mexico, in the east- central part of the Campeche Sound, 80 km north of Ciudad del Carmen, in the State of Campeche, Mexico. This mature giant field has produced 8.53 billion barrels of 22º API oil and 3.56 tcf of gas during 22 years of exploitation and still has 13.39 bboe of remnant 3P reserves. The geologic structure has, traditionally, been considered to be made up of four blocks: Akal, Nohoch, Chac, and Kutz, being the first the most important one, with more than 90% of the reserves. In may 2002, produces 1.91 mmbod and 700 mmcfgd from 191 wells, most of them completed in an early Cretaceous carbonate talus breccia. The possibility of a structurally favorable repeated section being present beneath the Cantarell Field was recognized more than ten years ago, but a lack of quality imaging and understanding of the structurally complex area, delayed the exploratory drilling. Initial results indicate that the new discovery, called Sihil, mayan word for autochtonous, falls in the P1 expectations. Booked 3P reserves for the discovery, most of them in a late Cretaceous-early Paleocene talus breccia facies were 1.23 bboe of both 22º and 30º oils, with appraisal drilling establishing three additional secondary production levels: an Eocene grainstone, an early Cretaceous dolomitized fractured mudstone to wackestone and a late Jurassic oolitic grainstone. The Sihil discovery confirmed the validity of a thrust fault play and allowed Pemex E&P to establish an exploration strategy for other structures on trend with similar characteristics that, when tested, will add even more hydrocarbon reserves to this once considered exploratory mature area. Introduction This paper is an update version of an earlier one prepared by the Exploration, Drilling, and Cantarell Asset groups of the Northeastern Marine Region of Pemex E&P, that was presented both, at OTC and AAPG conferences. We want to acknowledge Pemex E&P for the permission and support to present this paper and to all the Pemex personnel involved in the discovery and appraisal of this new field. The Cantarell field, discovered in 1976 offshore the state of Campeche, in southeastern Mexico, constitutes a world class supergiant. Located on the continental shelf of the southern Gulf of Mexico, within what is known as the Campeche sound, some 80 kilometers NNW of Ciudad del Carmen, Campeche, Mexico (Fig.1), is considered to be a mature field. It has produced approximately 8.53 mmmbo of 20 to 24° API gravities and 3.56 tcf during 22 years of exploitation. BLOCK 1 -- FORUM 2 117 PEMEX DISCOVERIES OF NEW OIL BEN
Abstract The Permian was an unusual time in the Earth's past, a time of continental accretion, falling sea level, and of global cooling. Basins formed at this time hold some of the most prolific petroleum systems in the world, are well studied, yet still hold much mystery with respect to their relationship between tectonic evolution, sedimentary fill, thermal maturities, and remaining exploration potential. One such important Permian basin is that of the deep Delaware Basin of southeastern New Mexico and west Texas U.S.A. Tectonic subsidence analysis of 11 boreholes reveal best fit kinetic maturities which require one major tectonic extension event from ~268 Ma to ~251 Ma (betas ~1.25 to ~1.53) and shortening from 80Ma to 65Ma (beta ~0.855). Principal source rocks are the underlying Devonian Woodford, Carboniferous Barnett, Permian Wolfcamp, Bone Spring and Delaware Mountain Group (DMG) formations. Modeling shows that the DMG and Bone Spring Formations are presently within the oil window whereas the Woodford and Barnett formations are below the oil window. The DMG began entering early mature oil phase in late Permian. Woodford and Barnett formation began entering the early mature oil phase in the late Pennsylvanian. The Bell Canyon formation is within the main oil window in the deeper part of Delaware Basin (northeast and eastern part of Delaware Basin) whereas the Brushy Canyon formation is within the main oil window in the northern part of the Delaware Basin. Major migration pathways in the Delaware Basin are SE to NW and SW to NE. The critical moment for the accumulation of liquids in the DMG and Bone Spring is Late Permian, around 265Ma -261Ma. Knowledge of the thermal maturity evolution of the Delaware Basin provides important constraints upon determining optimal exploration programs for exploiting liquids and gases either conventionally or unconventionally in these Permian strata.
Section I-Paper 17 THE MAIN SEDIMENTARY BASINS OF IRAN AND THEIR OIL PROSPECTS BY B. MOSTOFI" AND E. FREI** ABSTRACT. This paper, written in connection with the publication of the Geological Map of Iran on the scale 1 : 2,500,000, under press, reviews the main sedimentary basins of the Tertiary and older rocks, in relation to the genesis and accumulation of oil. Fourteen basins and subbasins, or areas, are described, nemely : from the Caspian-the Moghan plain, the Resht and Mazanderan cmbayments, and the Gorgan plain; from northeast Iran-the Sarakhs plain and Kopet Dagh; from north-west Iran-the Khoi, Tabriz-Shahpur, Mianeh, and Ardebil basins; from central Iran-the Main Central and Isfahan-Saidabad basins ; from southeast Iran--the Lut, Sistan, Jaz Murian, and Makran basins. Characteristic Sediments, fossils, and main stratigraphic breaks are summarized in a stratigraphie table of 7 columns which coincide with the principal sedimentary provinces of Iran. Tertiary deposits are treated in detail. A map of non-sedimentary rocks and salt plugs indicates the geographical posi- tion of the basins described. In the basins of central and northwestern Iran, Oligo-Miocene limestone in suitable structures, with evaporites or shales as cover rocks, forms the major prospects. In the Caspian area and in Makran facies conditions differ fundamentally, and oil accumulations are expected in elastic horizons of younger and youngest formations. Oil possibilities of older rocks are more brieflp discussed.
. En relation avec la prochaine publication d'une carte géologique de l'Iran à l'échelle de l/2,500,000ème, actuellement sous presse, cet article passe en revue les principaux bassins sédimentaires des roches tertiaires et de celles des époques antérieures, ainsi que leur relation avec la genèse et l'accumulation du pétrole. I1 décrit quatorze bassins principaux ou secondaires, (ou régions) de l'Iran, à savoir, dans la Caspienne: la plaine du Moghan, les baies de Resht et dn Mazanderan et la plaine de Gorgan; au Nord- Est: la plaine de Sarakhs et le Kopet Dagh; au Nord-Ouest: les bassins de Khoi, Tabriz-Shahpnr, Mianeh et Ardebil; an Centre: le grand Bassin Central et le bassin d'Ispahan-Saidabad; au Sud-Est: les bassins de la Lut, du Sistan, Jaz Murian et de Makran. Les sédiments caractéristiques, les fossiles, et les discontinuités stratigraphiques essentielles sont exposés dans une table stratigraphique à 7 colonnes correspondantes aux principales provinces sédimen- taires de l'Iran. Les dépôts tertiaires y sont traités plus en détail. Une carte des roches non-sédimen- taires et des dômes de sel montre la situation géographique des bassins décrits. Dans les bassins du Centre et du Nord-Ouest de l'Iran, le calcaire oligo-miocène en structures appropriées avec des évaporite ou des marnes comme roches de couverture, offre lea meilleures perspectives. Dans la région caspienne et l