Article

Hydrocarbon generation potential of the uppermost Jurassic—basal Cretaceous Sulaiy formation, South Iraq

Arabian Journal of Geosciences (Impact Factor: 1.15). 4(1):53-58. DOI: 10.1007/s12517-009-0064-y

ABSTRACT Organic geochemical analysis, palynology, and PetroMod software for the organic matters of subsurface Tithonian to Valanginian
Sulaiy formation of six wells in Basrah Region, South Iraq showed evidences for hydrocarbon generation potential. These analyses
include quantitative studies such as pyrolysis, fluorescence spectroscopy, and total organic carbon (TOC), while the qualitative
studies are the textural microscopy used in evaluating amorphous organic matter for palynofacies analysis leading to hydrocarbon
assessments. High TOC content of up to 7.3wt.%, kerogen type II of mesoliptinic type with hydrogen index of up to 466mg
HC/g TOC, and mature organic matter along with dysoxic–anoxic environment and stratigraphic framework have rated the succession
as a source rock for oil with ordinate gas, not only in Iraq but also in neighboring Kuwait and Saudi Arabia. This case study
is also inferred for hydrocarbon generation and expulsion by PetroMod software which confirmed the source potential.

لقد اظهرت تحليلات الجيوكيمياء العضوية والبالينولوجية والبرمجة الحاسوبية للمواد العضوية في تكوين السلي الممتد عمراً بين التيثوني
والفالانجيني لستة آبار في محافظة البصرة في جنوب العراق أدلة لقدرة نشوء الهيدروكاربونات. شملت هذه التحليلات دراسات كمية مثل
البيروليسيس والطيف الفلورسيني واجمالي المواد العضوية، بينما شملت الدراسات النوعية استعمال التراكيب المجهرية في تقييم المواد
العضوية العديمة الشكل التركيبي ضمن السحنات البالينولوجية المؤدية الى تحديد الهيدروكاربونات. لقد تم اعتبار التعاقبات الطبقية
لتكوين السلي صخوراً مصدرية للنفط وبعضاً من الغاز اعتماداً على الكمية العالية لاجمالي المواد العضوية حتى 3 ،7% وزناً وكيروجين
النوع الثاني الغني بالليبيد ومؤشر الهيدروجين الذي يصل الى 466 ملغم هيدروكاربون لكل غرام اجمالي المادة العضوية ومواداً عضوية
ناضجة وبيئة انعدام التهوية والهيكلية الطبقية، ليس في العراق فقط ولكن في الدول المجاورة الكويت والمملكة العربية السعودية. لقد
تم التأكد من نشوء الهيدروكاربونات واندفاعها من تكوين السلي لمناطق التجميع بواسطة البرنامج الحاسوبي البيترومود.

KeywordsSulaiy formation–South Iraq–Hydrocarbon generation–Upper jurassic–lower cretaceous

2 Bookmarks
 · 
242 Views
  • Source
    AAPG Bulletin 02/2013; Article # 20116:1-48. · 1.77 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: a b s t r a c t Thirty one crude oil samples from Lower Cretaceous reservoirs in southern Iraq were analyzed using bulk property and molecular methods to determine their maturity and biomarker characteristics, as well as to obtain information on their respective source rocks. All the oils are unaltered, non-biodegraded, have high sulfur content and API gravity is in the range for light to heavy oil (19–40° API). They are character-ized by low Pr/Ph values, even/odd predominance and front-end biased n-alkane distributions. Based on these parameters the oils were generated and expelled from a marine carbonate source rock bearing Type II-S kerogen. Compositional similarities of hopane and sterane biomarkers with those from potential source rocks allowed identification of the Upper Jurassic–Lower Cretaceous Sulaiy and Yamama carbon-ate succession as the effective source beds. A similar composition of normal and isoprenoid hydrocarbons among the oils suggests an origin from a common source rock. However, biomarker maturity ratios indi-cate a wide range of maturity. This appears to result from the type of burial history of the source rock, characterized by a slow passage through the liquid window interval during an extended period of geo-logic time.
  • [Show abstract] [Hide abstract]
    ABSTRACT: The Binalud Mountains of NE Iran represent the easternmost extension of the Alborz Range. After the Mid-Cimmerian orogenic event and rapid subsidence, the deep marine sediments of the Dalichai Formation were deposited. A well-preserved section of the formation was sampled for palynological purposes. The study revealed diverse and nearly well-preserved dinoflagellate cyst assemblages. Thirty-six dinoflagellate cyst species identified lead to identification of four biozones: Cribroperidinium crispum (Late Bajocian), Dichadogonyaulax sellwoodii (Bathonian to Early Callovian), Ctenidodinium continuum (Early to Late Callovian), and Ctenidodinium tenellum (Early Oxfordian) biozones. The close similarities of dinoflagellate cyst assemblages between Binalud Mountains, NE Iran, with those of Alborz Mountains (Northern Iran) during Middle Jurassic confirm the connection between two sedimentary basins during this time in Iran. Meanwhile, this biozonation corresponds largely to that established in Northwest Europe and reveals the marine connection between NE and North of Iran with Northwest Europe and the Northwestern Tethys during the Late Bajocian to Early Oxfordian.
    Arabian Journal of Geosciences 09/2013; · 1.15 Impact Factor

Full-text (2 Sources)

Download
340 Downloads
Available from
May 30, 2014