砂岩储集层孔隙结构与油气运聚的关系

在Pittman提供的方法基础上,提出了砂岩储层孔隙结构参数“峰点孔喉半径”(r峰)的新概念,并明确了其物理意义.研究了砂岩储层孔隙结构与油气运聚关系,结果表明,汞饱和度小于20%范围内的参数都与油气二次运移有关,而汞饱和度大于30%的孔隙结构参数是与油气聚集成藏有密切关系.在大庆长垣以西地区的扶杨油层的实际应用表明,在齐家—古龙凹陷周边,峰点孔喉半径为0.13～1.5μm的储层是油气成藏的有利地区.

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

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.