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Study on fractures and their stress features in oil reservoir of the Sanzhao area, Songliao Basin, China


, : Study on fractures and their stress features in oil reservoir of the Sanzhao area, Songliao Basin, China. Gaoxiao Dizhi Xuebao = Geological Journal of China Universities 5(3): 328-333

Located in the eastern Daqing placanticline, north part of the Songliao basin, the Sanzhao district is the most important peripheral oil accumulation area of Daqing oilfield. Since the Fuyang reservoirs are the main oil-bearing formations in this area and characterized by poor physical properties and low production, further studies on the reservoir fractures, as well as their effects in the modern stress field would be necessary for the efficient development and high-stable production of Daqing oilfield. Aimed to solve some urgent problems for the development of oilfield, such as the well water-out and production decrease caused by abundant fractures in the reservoirs, a comprehensive study has been conducted to investigate the properties and pattern of distribution of fractures in the Fuyang reservoir. Results of this study are summarized as the followings: (1) Natural fractures in the Sanzhao region are primarily oriented in near EW, NS and NE directions. Although the dominant fractures may vary both vertically and horizontally in different oilfields, most fractures are oriented approximately in EW direction. (2) Most fractures in the Fuyang reservoirs are shear fractures with high dip-angle. A close correlation has been found between the filling degree of fractures and the oil-bearing rank of sand-body. High oil-bearing rank is usually associated with the less filled fractures. (3) Quantitative study has suggested that the fracture density and the thickness of rocks is related to each other. The thicker the rocks, the lesser the fractures. (4) For the Fuyang reservoirs in the Sanzhao district, the largest horizontal major-stress has an approximate EW direction and natural fractures in EW direction are effective fractures.

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