Abstract
Micro-fractures, which are characterised by complex-non-structural geneses, are critical in tight sand reservoir production. Taking the Chang 6 reservoir of the Huaqing area, the Ordos basin, as an example, the influential factors of the micro-fracture development are analysed from a novel perspective. Studies show that the influences of above factors on micro-fracture are listed as follows: brittle mineral content > median grain size > stratum thickness > overburden pressure. In same lithology, enrichment position of rigid compositions is a key factor to the micro-fracture generation. However, sandstones are rigid and prone to forming micro-fracture. The effect of diagenesis on micro-fracture development is quite complex. Micro-fractures generate at the contact position between soft and hard materials. And then, the effects of micro-fractures on the well production have been analysed, which hence offers scientific guidance for further high-efficiency development of the Chang 6 tight sandstone oil reservoir in this area. [Received: December 28, 2016; Accepted: March 28, 2018]
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