Biostratigraphy of Dashtak and Khaneh Kat Formations in Zagros Basin

Khoshnoodkia, Mehdi; Mohseni, Hassan; Hajian, Mahmoud; Kheyrkhah, Mohammad Fallah; Tehrani, K. Khosro; Khaleghi, M.

doi:10.3997/2214-4609-pdb.248.304

Cited by 1 publication

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“…The Lower-Middle Triassic Dashtak Formation is a formation in the Kazerun Group with lithologies of do-lomite, shale, anhydrite, Argilaceuos dolomite, etc. The lithologies of this formation consist of 6 sequences alternately, such as the section of shale Agar evaporative part A, evaporative part B, evaporative part C, the Sefidar dolomite part, and evaporative part D. Due to the presence of thick anhydrite layers, this formation is considered as an important cap rock in the Zagros Basin for gas reservoirs of the Dahrom Group (Dalan and Kangan) in the south of Iran (Khoshnoodkia et al, 2010;Hajian-Barzi et al, 2015;Rahmani et al, 2018;Habibnia et al, 2016). In this study, petrophysical and geological information of two wells has been used for modelling.…”

Section: Geology Of the Regionmentioning

confidence: 99%

Drill Bit Selection in a Formation With Different Sedimentary Facies Using the Markov Chain: A Case Study at One of the Oil Fields in the South of Iran

Rad¹,

Negahban²,

Tokhmechi³

et al. 2021

MBPB

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The selection of a drill bit is an essential issue in well planning. Furthermore, identification and evaluation of sedimentary rocks before well drilling plays a crucial role in choosing the drill bit. Moreover, the Markov chain as a stochastic model is one of the powerful methods for identifying lithological units, which is based on the calculation of the transition probability matrix or transition matrix. The Markov chain experiences transitions from one state (a situation or set of values) to another according to specified probabilistic rules. In this paper, the Markov chain was implemented for bit selection in a formation with different sedimentary facies (such as the Dashtak Formation). Therefore, the proper drill bit was proposed by utilizing the transition matrix of rock facies and the available bits. This process was carried out in two wells where the thicknesses of the Dashtak Formation are 960 meters and 1410 meters. Consequently, the results indicate that the Markov chain is a practical method for selecting bits in a sequence of rock facies based on an acceptable matching between the reality mode (the used bits in the well) and the Markov chain results. Besides, in the case of using an improper bit in a well, and using a bit in a washing and reaming operation, there were differences between the used bits and the Markov chain outputs.

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Section: Geology Of the Regionmentioning

confidence: 99%