TY - JOUR

T1 - Применение литолого-геохимического подхода для определения генезиса каверновых коллекторов доломитового резервуара (нижний девон, Гыданский полуостров)

AU - Васильева, Ксения Юрьевна

AU - Ершова, Виктория Бэртовна

AU - Вилесов, А.П.

AU - Окунева, Т.Г.

AU - Рыбакова, А.Д.

AU - Солошенко, Н.Г.

AU - Прокофьев, В.Ю.

AU - Маслобоева, Анна Евгеньевна

AU - Севрюков, Д.А.

AU - Бугрова, Ирина Юрьевна

PY - 2025/3/30

Y1 - 2025/3/30

N2 - To evaluate the origin of cavernous hydrocarbon reservoir in the Lower Devonian dolostones (Western Taimyr, eastern coast of the Gydan Peninsula), the host rocks and the infilling carbonate minerals were studied using an integrated approach, including petrographic, cathodoluminescence, isotopic, geochemical and fluid inclusion studies. This approach showed that limestones that accumulated in the open subtidal shelf zone underwent dolomitization in early diagenesis, and dolomites with a fine-crystalline matrix were formed; the dolostones were significantly compacted during subsequent subsidence and geostatic compaction. The dolostones underwent fracturing the Late Hercynian tectonic phase (Late Carboniferous – Permian); fractures are associated with fissure caverns. Both fractures and caverns are partially filled with high-temperature generations of dolomite, quartz and calcite; low negative δ18О values and high positive Eu/Eu* anomalies confirm their hydrothermal genesis. Similarity in PAAS-normalized patterns of Rare Earth Elements in the host rock and vein (cavernous) carbonate mineral indicates that the source for the infilling carbonate was the host rock. The results obtained show the high potential of using the applied approach in establishing the stages of development of a carbonate reservoir and for predicting its distribution in the section and area.

AB - To evaluate the origin of cavernous hydrocarbon reservoir in the Lower Devonian dolostones (Western Taimyr, eastern coast of the Gydan Peninsula), the host rocks and the infilling carbonate minerals were studied using an integrated approach, including petrographic, cathodoluminescence, isotopic, geochemical and fluid inclusion studies. This approach showed that limestones that accumulated in the open subtidal shelf zone underwent dolomitization in early diagenesis, and dolomites with a fine-crystalline matrix were formed; the dolostones were significantly compacted during subsequent subsidence and geostatic compaction. The dolostones underwent fracturing the Late Hercynian tectonic phase (Late Carboniferous – Permian); fractures are associated with fissure caverns. Both fractures and caverns are partially filled with high-temperature generations of dolomite, quartz and calcite; low negative δ18О values and high positive Eu/Eu* anomalies confirm their hydrothermal genesis. Similarity in PAAS-normalized patterns of Rare Earth Elements in the host rock and vein (cavernous) carbonate mineral indicates that the source for the infilling carbonate was the host rock. The results obtained show the high potential of using the applied approach in establishing the stages of development of a carbonate reservoir and for predicting its distribution in the section and area.

KW - Gydan Peninsula

KW - Lower Devonian

KW - caverns

KW - diagenesis

KW - dolostone

KW - isotopic and geochemical studies

KW - reservoir development

UR - https://www.mendeley.com/catalogue/0f73ad9e-bd75-3e0a-b789-225095b6ed2f/

U2 - 10.18599/grs.2025.1.22

DO - 10.18599/grs.2025.1.22

M3 - статья

VL - 27

SP - 114

EP - 124

JO - Георесурсы

JF - Георесурсы

SN - 1608-5043

IS - 1

ER -