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Research on Micro Pore Structure of Overseas Tight Oil Reservoir and Its Influence on Ordos Basin
You Yuan, Niu Xiaobing, Xin Honggang, Feng Shengbin, Song Juan, Mao Zhenhua and Zhang Dandan
2013, 32(1):
12-18, 66.
DOI: 10.3969/j.issn.1002-302x.2013.01.003
Micro pore structure of tight oil reservoir holds the key to research of tight oil reservoir. It is also a main headache for tight oil exploration and development. Micro pore structure of tight oil reservoir is difficult for description of characteristics, classification and appraisal as well as forecast. In addition, pore structure is in complicated relations to oil and gas absorption and filtration. Some progress has been made in overseas study of micro pore structure of tight oil reservoir. For example, nano-pore throats have been discovered and the follow-up study was made on their genesis, thus developing a series of methods for micro-structure analysis and inspection. The digital-core technology was developed to quantitatively analyze components of minerals and their functions in micro flow, effectively clarify and characterize micro fractures, and make comparison and analysis of the sizes of various pores and fluidic molecules in the reservoir. Based on the foreign experience, this article discusses the mindset and method for study of micro pore structure of tight oil reservoir in Ordos Basin, aiming to make breakthrough in testing micro pore structure of tight oil reservoir, confirm existence of nano-pores in tight oil reservoir and its contribution, unveil the matching relations of pores and throats in tight oil reservoir, understand development of micro fracture in tight oil reservoir and its distribution law, and explore the methods for transformation and protection of tight oil reservoir.
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