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Relationship of pore structure of sand reservoir with hydrocarbon migration and accumulation

LIN Jing-ye (Exploration and Development Research Institute of Daqing Oil Field Company,Ltd.,Daqing 163712,China)  
On the basis of the Pittman method,a new concept of pore structure parameter of sand reservoir,namely "peak radius of pore and throat",was proposed.The physics meanings of the new concept were determined.The relation of pore structure of sand reservoir with hydrocarbon migration and accumulation indicates that the pore structure parameters of mercury saturation below 20 percent is concerned with secondary migration of oil and gas,and those of mercury saturation over 30 percent is concerned with hydrocarbon and reservoir accumulation.The practical application of this method to Fuyang reservoir in the western Daqing Changyuan area showed that the reservoirs with the peak radius of pore and throat in the range of 0.13 to 1.5μm may be the prospective area for oil and gas accumulation around Qijia-Gulong Depression.
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