Depositional Environment and Sequence Stratigraphy of the Neocomian Fahliyan Formation in the North Dezful Embayment, SW Iran

Sabouhi, Mostafa; Jahani, Davood; Qurayem, F. Taati; Aminzadeh, A.

doi:10.3997/2214-4609-pdb.248.007

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A great number of sedimentological, stratigraphic, sequence stratigraphy, and facies/log based reservoir studies have 2 Geofluids been performed on the Lower Fahliyan carbonate reservoir (e.g., [21][22][23][24][25][26][27]) with limited number of investigations, carried out on the pressure regime and characterization in the Zagros Fold-Thrust Belt and the Abadan Plain Basin. Conclusions obtained from the Fahliyan time equivalent Yamama reservoir in the Iraqi Majnoon oil field represent that the Yamama reservoir is an overpressured segmented into at least two separate fault compartments [28].…”

Section: Introductionmentioning

confidence: 99%

Formation Pore Pressure Variation of the Neocomian Sedimentary Succession (the Fahliyan Formation) in the Abadan Plain Basin, SW of Iran

2017

View full text Add to dashboard Cite

The Neocomian Fahliyan Formation is one of the important oil reservoirs in the Abadan Plain Basin, SW of Iran. To evaluate the pore pressure regime of the Fahliyan reservoir, 164 in situ pressure data points (MDT, XPT, and RFT) were analyzed from seven wells belonging to six oilfields. The pressure versus depth plot revealed that the Fahliyan reservoir is highly overpressured in all fields. The formation was characterized as a multilayered stacked reservoir with different pore pressure decreasing downward in a step-wise manner. Also, there is a major pressure step in the middle part of the reservoir, suggesting the presence of a regional efficient seal dividing the reservoir into two stacked compartments, where the upper compartment is more overpressured than the lower one. The stepped pressure pattern of the Fahliyan Formation is a regional phenomenon controlled by a factor governed regionally, the depositional condition, and facies lateral changes during the deposition of shallowing upward sequence of the Fahliyan reservoir. In addition, direct relationship is observed between the reservoir pressure and burial depth. This matter could amplify the initially generated overpressure state more possible due to dewatering of sediments and by-pass product of oil migration from Garau source rock to the Fahliyan reservoir.

show abstract