Title: Micro-fracture development impact factors analysis and its effects on well production of Hua-qing area Ordos Basin in China

Authors: Feng-juan Dong; Yuan Cao; Da-zhong Ren; Wei Sun

Addresses: Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil and Gas Reservoirs, College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi, 710065, China ' Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil and Gas Reservoirs, College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi, 710065, China ' Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil and Gas Reservoirs, College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, Shaanxi, 710065, China ' State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, Shaanxi, 710069, China

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]

Keywords: HuaQing area; Chang 6 reservoir; micro-fracture; influencing factors; well production; China.

DOI: 10.1504/IJOGCT.2019.099532

International Journal of Oil, Gas and Coal Technology, 2019 Vol.21 No.1, pp.39 - 56

Received: 28 Dec 2016
Accepted: 28 Mar 2018
Published online: 08 May 2019 *

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