Stress sensitivity and its influence factors of tight oil reservoir in Chang 7 Member, Ordos Basin

doi:10.3969/j.issn.1672-7703.2017.05.007

Abstract

Abstract: It is important to identify the stress sensitivity of tight oil reservoir and its influence factors, when the tight oil reservoir is developed by quasi-natural energies. Stress sensitivity experiment was conducted on the tight oil reservoir in Chang 7 Member of Yanchang Formation in the Ordos Basin under the reservoir pressure. It is indicated that the permeability of the Chang 7 tight oil reservoir is of medium to weak stress-sensitive. The petrology and micro-pore structure of the Chang 7 tight oil reservoirs with different types of stress sensitivity were analyzed and compared by the techniques of cast thin section, constant pressure mercury intrusion, constant-rate mercury intrusion, field emission scanning electron microscopy and Micro-CT, etc. The results suggest several influence factors on stress sensitivity, including the content of plastic components, types and contents of interstitial materials, and pore throat size. Through comprehensive analysis of the practices in the pilot development zone and the reservoir characteristics of Chang 7 tight oil reservoirs, it is found that the stress sensitivity affects greatly the oil production rate and the decline rate of horizontal wells due to sharp decrease of formation pressure in the stimulated intervals of Chang 7 reservoirs. Moreover, different development plans are prepared for the Chang 7 tight oil reservoirs depending on provenances, origins and physical properties, so as to mitigate the influence of stress sensitivity on productivity.

Key words: Ordos Basin, Chang7 Member, tight oil, stress sensitivity, petrology, pore structure

CLC Number:

TE122.2

Yang Xiao, Feng Shengbin, Wang Jiong, Niu Xiaobing, You Yuan, Liang Xiaowei, Wang Weibin. Stress sensitivity and its influence factors of tight oil reservoir in Chang 7 Member, Ordos Basin[J]. China Petroleum Exploration, 2017, 22(5): 64-71.

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