Results
Abstract. Pakistan has a long history of oil exploration Rรฉsumรฉ%. Pendant la dรฉcade passรฉe le Pakistan montrait with intensive activity during the past decade. Large depo- une activitรฉ intense dans l'exploration des champs pรฉtrosits of natural gas have been discovered in formations of liรจres. Des gisements larges en gaz naturel ont รฉtรฉ dรฉcouthe Tertiary age in both the wings of the country. Oil pro- verts dans des formations du Tertiaire situรฉes dans les deux duction, however, remains minor and is โmainly from the parties du pays. Mais, la production d'huile est insignifiante Early Tertiary in the small Potwar province where a recent et provient essentiellement du Tertiaire basse dans la petite discovery in the Jurassic rocks has revealed further pro- province de Potwar oรน une dรฉcouverte rรฉcente dans les spects. Oil exploration and geological surveys have result- roches jurassiques ร rรฉvรฉlรฉ des prospects futurs. L'exploed in a greater understanding of the area. ration de l'huile et les inspections gรฉologiques donnaient Pakistan comprises three sedimentary basins: the Bengal une meilleure connaissance du territoire. basin in East Pakistan; the Indus and the Baluchistan basins Le Pakistan comprend trois bassins sรฉdimentaires: le bassin in West Pakistan. A study of the architecture and depo- Bengal ร l'est et les bassins de l'Indus et du Beluchiston ร sitional history of these basins indicates that shallow l'ouest du pays. Une รฉtude de l'architecture et de l'histoire marine, and sometimes restricted environments, prevailed des dรฉpรดts de ces bassins indique que des environs plats during some of the Paleozoic, Mesozoic, and Tertiary ages marinsโ et limitรฉs prรฉdominent dans les territoires descenin the rapidly sinking trough and certain other areas. dant rapidement pendant les รฉpoques polรฉozoiques, mรฉso-Distribution of known hydrocarbon indications also points zoiques et tertiaires. La distribution connue des indications to the suitability of these areas for the generation and ac- d'huile montre que ces territoires sont convenables pour la cumulation of oil. Although some of the favourable areas gรฉnรฉration et l'accumulation de l'huile. Quoique quelques have been found unproductive many are not yet fully des ces zones favorisรฉes soient trouvรฉes non-productives il tested. Some comparatively unknown areas also may have y en a beaucoup qui n'ont รฉtรฉ pas encore examinรฉes. On promise. croit que certaines d'autres zones maintenant inconnues so ยกen t prod u ctives. INTRODUCTION West Pakistan and ]drilled a number of bore holes. The only production in the 19th century was obtain-Petroleum investigation in Pakistan can be traced ed at Khhattan where about 800,000, gallons were back to 1869 when a shallow bore hole was drilled by produced during 1886-94. a government agency near an oil seepage at Fateh-
- Asia > Pakistan (1.00)
- Asia > Middle East > Iran (0.49)
- Phanerozoic > Paleozoic > Cambrian (1.00)
- Phanerozoic > Mesozoic > Jurassic (1.00)
- Phanerozoic > Cenozoic > Tertiary (1.00)
- (6 more...)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (1.00)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Marine Environment (0.67)
- Asia > Pakistan > Sindh > Ghotki District > Middle Indus Basin > Guddu Block > Mari Field (0.99)
- Asia > Pakistan > Lower Indus Basin (0.99)
- Asia > Pakistan > Balochistan > Ranikot Formation (0.99)
- (13 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
This paper describes the history, stratigraphy, structure and some of the development problems of the Gachsaran oilfield, which is situated near the boundary of the provinces of Khuzestan and Fars in southern Iran (Persia), and is probably one of the world's largest oilfields. The field was discovered in 1928, but until 1956 was, on account of the relatively heavy and sulphurous character of its crude, developed only to a limited degree. Shifts in the marketing, demand and refining situation, however, have now led to extensive development. Gachsaran is at present the most southeasterly of the line of fields in the Khuzestan foothills of the Zagros Range. As to structure, stratigraphy and producing characteristics, the field is of the classic Khuzestan type, and has individual well Potentials of the order of 20,000 to 40,000 bpd from the Asmari Limestone (Oligocene-Miocene). The latter is folded into a very simple pattern of large antidines and synclines, but is overlain by a complicated and disconformable overburden of Miocene evaporites and clastics (the Lower Fars formation); the principal development problems are consa quently the forecasting of the attitude of the Asmari below the disconformable cover, and the difficulties entailed in drilling through the unstable, mobile and highly-pressured Lower Fars overburden. The field as so far provisionally delineated is 130 square miles in area to the oil-water eontact, and has au Asmari Limestone oil column of 7150 ft. and two small separate gas-caps. The present production of the field is 60,000 bpd of 32"API oil through a 12-inch pipeline to the Bandar Ma'shur crude terminal and the Abadan refinery. The first stage of the present extensive development calls for increase in production capacity to 450,000 bpd, to be exported mainly through a new 26/28/30" pipeline, one hundred miles long, terminating on the island of Kharg in the Persian Gulf.
- Asia > Middle East > Iran > Khuzestan (1.00)
- Asia > Middle East > Iran > Kohgiluyeh and Boyer-Ahmad (0.71)
- Phanerozoic > Mesozoic > Cretaceous > Upper Cretaceous (0.68)
- Phanerozoic > Mesozoic > Cretaceous > Lower Cretaceous (0.68)
- Phanerozoic > Cenozoic > Paleogene (0.66)
- Phanerozoic > Cenozoic > Neogene > Miocene (0.44)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (0.90)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock > Limestone (0.61)
- Asia > Middle East > Kuwait > Jahra Governorate > Arabian Basin > Widyan Basin > Lower Fars Formation (0.99)
- Asia > Middle East > Iraq > Kirkuk Governorate > Zagros Basin > Baba Gurgur Field > Kirkuk Field > Qamchuqa Formation > Upper Qamchuqa Formation (0.99)
- Asia > Middle East > Iraq > Kirkuk Governorate > Zagros Basin > Baba Gurgur Field > Kirkuk Field > Qamchuqa Formation > Tarjil Formation (0.99)
- (48 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Production and Well Operations (1.00)
- (5 more...)