Controlling factors on fracture development in the tight sandstone reservoirs:A case study of Jurassic-Neogene in the Kuqa foreland basin

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  • 1.Science and Technology Innovation Team on Fault Deformation,Sealing and Fluid Migration,Northeast Petroleum University,Daqing 163318,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,Beijing 102249,China;
    3.Petroleum Geology Research & Experiment Center,Research Institute of PetroleumExploration & Development,PetroChina,Beijing 100083,China;
    4.The Fourth Oil Production Company of Daqing Oilfield Co.Ltd.,Daqing 163511,China

Received date: 2016-10-13

  Revised date: 2016-11-23

  Online published: 2017-02-10

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.

Cite this article

Gong Lei,Gao Ming-ze,Zeng Lian-bo,Fu Xiao-fei,Gao Zhi-yong,Gao Ang,Zu Ke-wei,Yao Jia-qi . Controlling factors on fracture development in the tight sandstone reservoirs:A case study of Jurassic-Neogene in the Kuqa foreland basin[J]. Natural Gas Geoscience, 2017 , 28(2) : 199 -208 . DOI: 10.11764/j.issn.1672-1926.2016.12.003

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