塔里木盆地奥陶系鹰山组多类型白云岩储层成因机制

doi:10.11743/ogg20200109

Abstract

Abstract:

The Ordovician Yingshan Formation is one of the most important targets of petroleum exploration in the Tarim Basin. The genetic mechanism of well-developed dolomite reservoirs of multiple types has always been a focus of study here. The micropetrologic and geochemical characteristics of various dolomite reservoirs, including shallow buried, karstified and hydrothermal modification types, are revealed through analyses of tectonic-sedimentary setting, thin section observation and scanning electron microscopy, combined with in-situ carbon-oxygen isotopes, whole-rock carbon-oxygen-strontium isotopes, and fluid inclusion data. The dolomite reservoir of shallow-buried type is characterized by obvious euhedral crystals, and the consistent carbon and oxygen isotope compositions of mineral dolomite with different occurrences, reflecting the similar source of dolomitization fluids. The dolomite reservoir of karstified type is characterized by dedolomitization, calcite cementation of meteoric water origin, and negative δ¹⁸O values and rich radiogenic ⁸⁷Sr. The dolomite reservoir of hydrothermal modification type is typically characterized by such hydrothermal minerals as fluorite and quartz. Its hydrothermal fluids are typically high in temperature and salinity, and the dolomite and calcite cements are characterized by negative ¹⁸O and Eu positive anomaly in forming the reservoir space. The multiple origins of dolomite reservoirs determine that their development and distribution are controlled by many factors including lithofacies, local structural locations, and fluid properties.

Key words: dolomitization, dedolomitization, hydrothermal fluid, carbonate rock, Ordovician, Tarim Basin

CLC Number:

TE122.2

Donghua You, Zicheng Cao, Mingjun Xu, Yixiong Qian, Shi Wang, Xiaolin Wang. Genetic mechanism of multi-type dolomite reservoirs in Ordovician Yingshan Formation, Tarim Basin[J]. Oil & Gas Geology, 2020, 41(1): 92-101.

Figures/Tables 5

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Genetic mechanism of multi-type dolomite reservoirs in Ordovician Yingshan Formation, Tarim Basin

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