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- Title
Controlling factors on fracture development in the tight sandstone reservoirs: A case study of Jurassic-Neogene in the Kuqa foreland basin.
- Authors
Gong Lei; Gao Ming-ze; Zeng Lian-bo; Fu Xiao-fei; Gao Zhi-yong; Gao Ang; Zu Ke-wei; Yao Jia-qi
- Abstract
Systematically illuminating the controlling factors on fracture development in the tight sandstone reservoirs is the key basis to accurately predict the fracture distribution. Fractures in the tight sandstone reservoirs of Kuqa foreland basin are quantitatively characterized, and a systematic research on the fracture distribution and controlling factors is carried out. Tectonic fractures are dominant in the tight sandstone reservoirs, and their development was controlled by inherent (e.g.,lithology,mechanical stratigraphy, sedimentary micro-facies and diagenesis facies) and external (structural position and overpressure) factors. Rocks with high content of brittle minerals, fine grain size, low porosity and well sorting are conducive to the development of fractures. Fractures often develop in the competent rocks and their height is equivalent to the thickness of mechanical layer. Sedimentary micro-facies with thick cumulative deposition thickness, thin single layer and fine granularity are the favorable area for fracture development. Diagenesis facies with dense compaction and cementation are also areas favorable for fracture development. Vicinity of fault and hinge of fold are area of local stress concentration,thus the fracture density increased significantly. The existence of overpressure promotes the failure of rocks.
- Subjects
FRACTURE mechanics; RESERVOIRS; GEOLOGICAL basins
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 2, p1
- ISSN
1672-1926
- Publication type
Abstract
- DOI
10.11764/j.issn.1672-1926.2016.12.003