Petroleum Science >2013, Issue 3: 282-291 DOI: https://doi.org/10.1007/s12182-013-0277-2
Controlling effects of the Ordoviciancarbonate pore structure on hydrocarbonreservoirs in the Tarim Basin, China Open Access
文章信息
作者：Wu Guanghui,Yang Haijun,Li Haowu and Sun Lixia1
作者单位：
School of Marine Sciences, Sun Yat-sen University, Guangdong 510006, China 2 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;3 PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China;2 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;3 PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
投稿时间：2012-04-08
引用方式：Wu, G., Yang, H., Li, H. et al. Pet. Sci. (2013) 10: 282. https://doi.org/10.1007/s12182-013-0277-2Wu, G., Yang, H., Li, H. et al. Pet. Sci. (2013) 10: 282. https://doi.org/10.1007/s12182-013-0277-2
文章摘要
The Ordovician carbonate reservoirs in the Tarim Basin with secondary dissolution pores and
vugs have complicated pore structures. The weathering crust reservoirs mainly consist of large cavities
or vugs connected by fractures, but most of the reef-shoal reservoirs have complex and small throats
among matrix pores. The pore structure can be divided into four types: big pore and big throat, big pore
but small throat, small pore and small throat, and fracture type. Most of the average throat radius falls
between 0.03 and 0.07 μm, close to that of unconventional reservoirs except in local areas with developed
fractures. Fluid driving force analysis shows that the differentiation of fluid is mainly controlled by
the throat radius in two kinds of mechanism separated by the critical throat radius about 0.1 μm. There
is obvious fluid differentiation and oil/gas/water contact in fracture-cavity reservoirs with big throats.
However, most of reservoirs under the critical throat radius have high capillary pressure, which resulted
in incomplete differentiation of gas/oil/water, and complicated fluid distribution and fluid properties in the
unconventional reservoirs.
vugs have complicated pore structures. The weathering crust reservoirs mainly consist of large cavities
or vugs connected by fractures, but most of the reef-shoal reservoirs have complex and small throats
among matrix pores. The pore structure can be divided into four types: big pore and big throat, big pore
but small throat, small pore and small throat, and fracture type. Most of the average throat radius falls
between 0.03 and 0.07 μm, close to that of unconventional reservoirs except in local areas with developed
fractures. Fluid driving force analysis shows that the differentiation of fluid is mainly controlled by
the throat radius in two kinds of mechanism separated by the critical throat radius about 0.1 μm. There
is obvious fluid differentiation and oil/gas/water contact in fracture-cavity reservoirs with big throats.
However, most of reservoirs under the critical throat radius have high capillary pressure, which resulted
in incomplete differentiation of gas/oil/water, and complicated fluid distribution and fluid properties in the
unconventional reservoirs.
关键词
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Carbonate, throat radius, critical hydrocarbon column, unconventional reservoir, mechanism