Evaluation of natural fractures and geological sweet spot in the Shunbei ultra-deep carbonate fault-controlled reservoir, Tarim Basin

The Shunbei ultra-deep carbonate strike-slip fault-controlled reservoir in Tarim Basin is rich in reserves. The strike-slip faults and the natural structural fractures are the main storage space and flow channels of hydrocarbon resources. Therefore, studying the natural fracture development characte...

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Bibliographic Details
Published in:Carbonates and evaporites 2024-06, Vol.39 (2), p.20, Article 20
Main Authors: Zhang, Gemeng, Ru, Zhixing, Li, Yingtao, Liu, Shuang
Format: Article
Language:English
Subjects:
Brittle fracture
Brittleness
Carbonates
Cores
Density
Dolomite
Dolostone
Earth and Environmental Science
Earth Sciences
Flow channels
Fractures
Geology
Lime
Limestone
Lithology
Mineral Resources
Mineralogy
Mudstone
Ordovician
Original Article
Permeability
Porosity
Reservoirs
Strike-slip faults
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Summary:The Shunbei ultra-deep carbonate strike-slip fault-controlled reservoir in Tarim Basin is rich in reserves. The strike-slip faults and the natural structural fractures are the main storage space and flow channels of hydrocarbon resources. Therefore, studying the natural fracture development characteristics in this kind of reservoir is of great significance. The lithology of the Middle and Lower Ordovician strata in the Shunbei area is limestone and dolomite, including packstone, wackestone, grainstone, boundstone, lime mudstone, silicified limestone and silty-fine crystalline dolomite, medium-coarse crystalline dolomite. Based on the statistics of fracture density and brittleness index of core samples, it is found that in limestone, lime mudstone has the highest brittleness index, while boundstone has the lowest; in dolomite, the brittleness index of medium-coarse crystalline dolomite is higher than that of silty-fine crystalline dolomite. The natural structural fracture density has an obvious positive correlation with the rock brittleness index. The brittleness index of dolomite is generally higher than that of limestone. When the brittleness index is the same, dolomite has superior porosity and permeability, whereas limestone has a stronger capacity to fracture. Those kinds of highly brittle layers in carbonate reservoirs are more likely to be geological sweet spots in the Shunbei area.
ISSN:0891-2556
1878-5212
DOI:10.1007/s13146-024-00926-9