بایوستراتیگرافی سازند گرو در برش­ تحت­الارضی چاه نفت، جنوب کرمانشاه

نویسندگان

1 کارشناس ارشد دانشگاه شهید بهشتی

2 دانشیار گروه زمین شناسی دانشگاه شهید بهشتی

3 استاد گروه زمین شناسی دانشگاه شهید بهشتی

4 دکتری چینه شناسی و فسیل شناسی از دانشگاه شهید بهشتی

چکیده

  به منظور مطالعه بایوستراتیگرافی سازند گرو در ناحیۀ لرستان مرکزی، یک برش تحت­الارضی در تاقدیس نفت در جنوب کرمانشاه انتخاب و مورد بررسی قرار گرفت. ستبرای حفاری شدۀ سازند گرو در این برش 485 متر است و از نظر سنگ­شناسی از سنگ آهک رسی و مارن خاکستری تیره تشکیل شده است. در این پژوهش در مجموع 1150 مقطع نازک مورد بررسی قرار گرفته است. در مطالعات زیست چینه­ای سازند گرو در برش­ مورد مطالعه ضمن تشخیص 61 گونه متعلق به 17 جنس از روزن­داران پلانکتونی، 9 بایوزون شناسایی و معرفی شده است. بر مبنای گسترش چینه ­ شناسی فسیل­ها و بایوزون­های معرفی شده، سن سازند گرو در بخش حفاری شده برش تحت الارضی چاه نفت آپتین پیشین- سنومانین پیشین می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Biostratigraphy of the Garau Formation in Naft well subsurface stratigraphic section, South Kermanshah

نویسندگان [English]

  • Y., , Ezampanah 1
  • A., Sadeghi, 2
  • M. H., Adabi, 3
  • A. M., Jamali 4
1 M.Sc, Shahid Beheshti University
2 Associete Professor, Department of Geology, Shahid Beheshti University
3 Professor, Shahid Beheshti University
4 Stratigraphy and Paleontology Department of Shahid Beheshti University
چکیده [English]

In order to biostratigraphy of the Garau Formation in the centeral Lurestan, one subsurface section (Naft well) in Naft anticline, south Kermanshah was selected and studied. The drilled thickness of the Garau Formation in this section is up to 485 meters and lithologically composed of argillaceous limestones and dark gray marls. In this research 1150 thin sections of subsurface Naft well section were studied. In biostratigraphic studies of the Garau Formation in study section 61 species belong to 17 genera of planktonic foraminifera were recognized and 9 biozones were identified. Based on distribution of fossils and biozones identificated, the age of the Garau Formation in drilled part of the subsurface Naft well section is Early Aptian to Early Cenomanian

کلیدواژه‌ها [English]

  • Biostatigraphy
  • Garau Formation
  • Aptian
  • Cenomanian
  • Kermanshah

 

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Plate 1

 

 

Figs. A, B: Globigerinelloides blowi (Bolli, 1959);C- F: Schackoina cabri Bolli, 1957; G, H: Globigerinelloides algeriana Cushman & ten  Dam, 1948; I, J: Globigerinelloides ferreolensis

Moullade, 1961;K: Hedbergella bizonae (Chevalier, 1961); L-N: Hedbergella roblesae (Obergon de la parra, 1959); O, P: Globigerinelloides barri (Bolli, Loeblich & Tappan, 1957); Q, R: Hedbergella gorbachikae Longoria, 1974; S: Hedbergella Praetrocoidea Longoria, 1974; T: Hedbergella trocoidea Gandolfi, 1942.

 

Plate 2

 


Figs.; A: Globigerinelloides aptiensis Longoria, 1974; B: Planomalina buxtorfi (Gandolfi, 1942);


C, D: Muricohedbergella simplex (Morrow, 1934); E: Ticinella madecassianaSigal, 1966; F: Ticinella raynaudi Sigal, 1966; G: Ticinella  roberti (Gandolfi, 1942); H: Rotalipora subticinensis (Gandolfi, 1957); I: Rotalipora ticinensis (Gandolfi, 1942); J: Rotalipora. appenninica (Renz, 1936);  K:Rotalipora brotzeni Sigal, 1948; L: Rotalipora gandolfi Luterbacher &Premoli Silva, 1962. M: Muricohedbergella planispira Tappan, 1940; N:Heterohelix  moremani  (Cushman, 1938); O: Costellagerina libyca (Barr, 1972); P,Q: Schackoina cenomana Schacko, 1897; R: Schackoina bicornis Reichel, 1948; S:  Schackoina pentagonalis Reichel, 1948; T: Praeglobotruncana delrioensis (Plummer, 1931).