Meteoric Water Incursion, Crude Oil Degradation and Calcite Cementation of an Upper Cretaceous Reservoir in the Zagros Foreland Basin (Kurdistan Region of Iraq)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F23%3A73620602" target="_blank" >RIV/61989592:15310/23:73620602 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2073-4441/15/10/1953" target="_blank" >https://www.mdpi.com/2073-4441/15/10/1953</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/w15101953" target="_blank" >10.3390/w15101953</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Meteoric Water Incursion, Crude Oil Degradation and Calcite Cementation of an Upper Cretaceous Reservoir in the Zagros Foreland Basin (Kurdistan Region of Iraq)

Popis výsledku v původním jazyce

Field observations, together with the results of gas chromatography-mass spectrometry (GC-MS) and stable carbon isotope analysis of bitumen, coupled with fluid inclusion microthermometry and stable isotope analyses of closely associated vug- and fracture-filling columnar calcite in the Upper Cretaceous Bekhme Formation, Kurdistan Region of Iraq, suggest that the degradation of crude oil was caused by the regional incursion of meteoric waters. This incursion, which is interpreted to have occurred during tectonic uplift during the Zagros Orogeny, is evidenced by: (i) the depletion of n-alkanes and acyclic isoprenoid alkanes (pristane and phytane) in the bitumen; (ii) low delta C-13(VPDB) values (-8.5 parts per thousand to -3.9 parts per thousand) and delta O-18(VPDB) values (-22.9 parts per thousand to -15.0 parts per thousand), with more radiogenic Sr isotopic ratios (0.70771-0.70772) compared to Cretaceous seawater; and (iii) low salinity and low temperatures (20 to 40 degrees C) in fluid inclusions of the columnar calcite. This study demonstrates that regional meteoric water incursion into sedimentary basins can be linked to crude oil degradation accompanied by calcite cementation events in carbonate reservoirs.

Název v anglickém jazyce

Meteoric Water Incursion, Crude Oil Degradation and Calcite Cementation of an Upper Cretaceous Reservoir in the Zagros Foreland Basin (Kurdistan Region of Iraq)

Popis výsledku anglicky

Field observations, together with the results of gas chromatography-mass spectrometry (GC-MS) and stable carbon isotope analysis of bitumen, coupled with fluid inclusion microthermometry and stable isotope analyses of closely associated vug- and fracture-filling columnar calcite in the Upper Cretaceous Bekhme Formation, Kurdistan Region of Iraq, suggest that the degradation of crude oil was caused by the regional incursion of meteoric waters. This incursion, which is interpreted to have occurred during tectonic uplift during the Zagros Orogeny, is evidenced by: (i) the depletion of n-alkanes and acyclic isoprenoid alkanes (pristane and phytane) in the bitumen; (ii) low delta C-13(VPDB) values (-8.5 parts per thousand to -3.9 parts per thousand) and delta O-18(VPDB) values (-22.9 parts per thousand to -15.0 parts per thousand), with more radiogenic Sr isotopic ratios (0.70771-0.70772) compared to Cretaceous seawater; and (iii) low salinity and low temperatures (20 to 40 degrees C) in fluid inclusions of the columnar calcite. This study demonstrates that regional meteoric water incursion into sedimentary basins can be linked to crude oil degradation accompanied by calcite cementation events in carbonate reservoirs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Water

ISSN

2073-4441

e-ISSN

—

Svazek periodika

15

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

16

Strana od-do

"1953-1"-"1953-16"

Kód UT WoS článku

000997540300001

EID výsledku v databázi Scopus

2-s2.0-85160636041