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- Title
Fracture development of different structural styles in Kuqa foreland thrust belt: From outcrop observation of structural fracture.
- Authors
Liu Chun; Zhang Rong-hu; Zhang Hui-liang; Wang Bo; Huang Wei
- Abstract
Natural fracture in reservoir has important influence on oil and gas production. It is difficult to determine the distribution of fracture network's heterogeneity only rely on limited downhole data. In addition, it is also difficult to obtain a large number of the static parameters for fracture numerical simulation, so the quantitative evaluation of fracture faces greater challenge. Based on typical tectonic styles of Kuqa foreland thrust belt outcrop area (which include thrust monoclinic, high angle thrust anticline and slip anticline), this article described the fracture unique development and distribution characteristics of different tectonic styles, then established the fractures development models of different tectonic style, finally analyzed the controlling factors on fracture growth. The results show that the thrust monocline fold develops two phases fractures, the strike direction are NNW mainly. Late vertical open fractures have absolute priority in this tectonic style, and early high angle oblique fracture is filled by calcite. The density of fracture from core of anticline to wing has decreasing tendency. High angle thrust anticline develops three phases fracture, and the strike direction is NNW and NWW. The early fracture was full filled by calcite, middle-late fracture are opened. The fracture cut off the single sand body and converges to rock bed, which have obvious mechanical stratigraphic characteristics. The steep wing of anticline’s developed more tectonic fractures than that of slower wing, which shows asymmetric distribution. The compression wing of slip anticline develops two stage high angle oblique open fracture,and the fracture strike direction is NNW and NEE. The sandstone deformation of barrier wing is weak in which it doesn't have obvious fracture development. The fracture growth characteristics under different structural styles are of great significance to the numerical simulation of fracture and the prediction of reservoir distribution.
- Subjects
GAS reservoirs; PETROLEUM production; TECTONIC landforms; CALCITE; ROCK-forming minerals; SEDIMENTATION &; deposition
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 1, p1
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2016.11.020