geolmsuВЕСТНИК МОСКОВСКОГО УНИВЕРСИТЕТА. СЕРИЯ 4. ГЕОЛОГИЯMoscow University Bulletin. Series 4. Geology0579-9406Издательский Дом МГУ10.55959/MSU0579-9406-4-2024-63-6-163-172geolmsu-760Research ArticleСтатьиГидрогеохимическое моделирование образования сероводорода в карбонатном коллекторе на примере месторождения Шануль, юго-запад ИранаHydrogeochemical Modeling of Hydrogen Sulfide Formation in a Carbonate Reservoir: A Case Study of the Shanul Field, Southwest Iranhttps://orcid.org/0000-0002-8223-4454ГолизадеХ.GholizadehH.

Хамидреза Голизаде

Москва

Hamidreza Gholizadeh

Moscow

H.r.Gholizade@gmail.comhttps://orcid.org/0000-0001-6699-0770КрасноваЕ. А.KrasnovaE. A.

Елизавета Андреевна Краснова

Москва

Elizaveta A. Krasnova

Moscow

e.krasnova@oilmsu.ruКорзунА. В.KorzunA. V.

Анна Вадимовна Корзун

Москва

Anna V. Korzun

Moscow

A.Korzun@mail.ruhttps://orcid.org/0000-0002-5447-3909РаббаниА.RabbaniA.

Ахмадреза Раббани

Тегеран

Ahmadreza Rabbani

Tehran

Rabbani@aut.ac.irМосковский государственный университет имени М.В. ЛомоносоваРоссияLomonosov Moscow State UniversityRussian FederationМосковский государственный университет имени М.В. Ломоносова; Институт геохими и и аналитической химии им. В.И. Вернадского РАНРоссияVernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of SciencesRussian FederationТехнический Университет имени АмиркабираИранAmirkabir University of Technology, Faculty of Petroleum EngineeringIslamic Republic of Iran20242901202506163172Copyright © Голизаде Х., Краснова Е.А., Корзун А.В., Раббани А., 20252025Голизаде Х., Краснова Е.А., Корзун А.В., Раббани А.Gholizadeh H., Krasnova E.A., Korzun A.V., Rabbani A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestnik.geol.msu.ru/jour/article/view/760

Термохимическое восстановление сульфатов (ТСР) является одним из механизмов происхождения сероводорода в коллекторе. В последние годы были разработаны новые подходы к гидрогеохимическому моделированию процесса ТСР в углеводородных резервуарах. Эти модели были разработаны для понимания основных гидрогеохимических механизмов образования сероводорода и его контролирующих факторов. В настоящей работе на примере месторождения Шануль на юго-западе Ирана было проведено моделирование процесса ТСР в пермских — нижнетриасовых отложениях. В данном исследовании была использована одномерная диффузионная модель массопереноса (Phreeqc), основанная на равновесных реакциях взаимодействия газ-вода-порода и кинетических реакциях восстановления сульфатов и метаногенеза. Результаты моделирования показали, что на скорость протекания ТСР и объем H2S влияют в большей степени три фактора: минеральный состав вмещающей породы-коллектора, перепад давления резервуара и pH пластовой воды. Главную роль в интенсивности образования сероводорода в пласте играет минеральный состав. Присутствие железосодержащих минералов может резко снизить уровень сероводорода. Результаты моделирования показывают, что присутствие 5% железосодержащих минералов полностью удаляет из системы сероводород за 20 лет. Более того, было отмечено, что изменение пластового давления при добыче или закачки воды также значительно влияет на содержание сероводорода в пласте. Падение давления до пятидесяти процентов (с 600 до 300 атм.) от начального пластового давления увеличивает содержание H2S более чем в десять раз (с 4 × 10–4 до 4 × 10–3 моль/кг (H2O)). Кроме того, было показано, что изменение рН водного раствора существенно изменяет скорость ТСР. Скорость образования сероводорода увеличивается в более кислой среде. По результатам моделирования снижение pH воды на 20% (с 6,5 до 5,7) приведет к увеличению концентрации H2S с 8 × 10–4 до 16 × 10–4 моль/кг (H2O).

Thermochemical sulfate reduction (TSR) is one of the mechanisms responsible for the generation of hydrogen sulfide in a reservoir. Recently, novel hydrogeochemical modeling approaches are developed to unravel TSR in hydrocarbon reservoirs. These modeling were developed in order to comprehend the basic hydrogeochemical mechanisms for H2S production and its controlling factors. In this paper, the modeling of the TSR process in Permian-Lower Triassic deposits was carried out using the example of the Shanul gas field in southwestern Iran. The one-dimensional diffusive mass transport model used in this study (Phreeqc) is based on equilibrium reactions for gas–water–rock interactions and kinetic reactions for sulfate reduction and methanogenesis. The simulation results show that the intensity of the TSR reaction and the volume of driven H2S are influenced to a large extent by three factors: the mineral composition of the host reservoir rock, the pressure drop of the reservoir, and the pH of the formation water. The results highlight that, the mineral composition of the host rocks alters the intensity of TSR process. The presence of iron containing minerals may significantly inhibit the H2S production. Modeling results show that the presence of 5% iron-containing minerals could completely remove hydrogen sulfide from the system within 20 years. Moreover, it has been observed that the change in reservoir pressure after production or injection also significantly affects the content of hydrogen sulfide in the reservoir. A pressure drop up to fifty percent (from 600 to 300 atm) of the initial reservoir pressure increases the H2S content by more than ten times (from 4×10–4 to 4×10–3 mol/kg (H2O). In addition, it has been shown that changing the pH of an aqueous solution significantly changes the rate of TSR reaction. According to the simulation results a 20% decrease in water pH (From 6.5 to 5.7) will lead to an increase in H2S concentration from 8×10–4 to 16×10–4 mol/kg (H2O).

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The authors declare that there are no conflicts of interest present.