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Article by Jiang L
Article by Xia D
Article by Zhu Z
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Differences in reservoir-forming dynamic characteristics of tight sandstone reservoir and conventional sandstone reservoir: a case from Fuyu sandstone reservoir of Sanzhao area in northern Songliao Basin
JIANG Li-na1, XIA Dan1, ZHU Zheng-yuan2
1. Exploration and Development Research Institute of Daqing Oilfield Co. Ltd., Daqing 163712, Heilongjiang, China;
2. The First Oil Production Company of Daqing Oilfield Co. Ltd., Daqing 163712, Heilongjiang, China
Abstract: In order to investigate the characteristics of Fuyu oil sandstone reservoir, three-dimensional CT scanning technology and rate-controlled mercury penetration technique are used to describe the micro pore throats structure. Results show that the widely developed pore throats of conventional sandstone reservoirs are micro scale pore throats with good connectivity. The scattered developed pore throats of tight sandstone reservoirs are nano scale pore throats with poor connectivity. The differences of micro pore throats determine the differences of oil and gas filling, migration, accumulation and percolation mechanism. By means of high pressure mercury injection test, buoyancy and capillary resistance formula and core flow test in Fuyu reservoir, it is concluded that the driving force for primary migration of oil and gas is overpressure and the main driving force for the second migration and accumulation is buoyancy in the conventional sandstone reservoir. Oil and gas mainly migrate laterally, and the association of faults and sand bodies provides the main migration pathway. Fluid flow state follows Darcy flow law in the conventional sandstone reservoir. Whereas in tight sandstone reservoir, the driving force of oil and gas is overpressure. Oil and gas mainly migrate vertically, and the fluid presents low velocity non-Darcy flow phenomenon. The difference of reservoir-forming dynamics determines the difference of reservoir geological characteristics and distribution. The analysis shows that the conventional reservoir in Sanzhao area is mainly in the long distance and high structure area with obvious oil-water contact, i.e. the water is under the oil, which is subjected to structural control, while the tight reservoir is mainly located near and below the source, and oil and gas are accumulate in "sweet spot" area. Trap boundary is not obviously.
Keywords: micro pore structure   reservoir-forming dynamic characteristics   non-Darcy flow   reservoir characteristics  
�ո����� 2016-12-08 �޻����� 2017-04-24 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2018.01.017
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