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塔河油田缝洞型碳酸盐岩储集层中的溶洞是主要的油气储集空间,呈高度离散分布。为更好地认识此类油藏的开采动态特征,提出单洞模型进行弹性开采实验研究。结果表明:单洞模型压力、产量随时间呈指数关系递减;基于物质平衡理论,建立单洞型油藏压力、产量递减模型。采用该递减模型可有效计算单洞模型的压力、产量,验证溶洞原始体积的相对误差为4.23%,证明该模型的有效性和合理性。
The karst caves in the fractured-vuggy carbonate reservoirs in Tahe Oilfield are the major oil and gas reservoir spaces with highly discrete distribution. In order to better understand the dynamic characteristics of this kind of reservoir, a single-hole model is proposed to study the elastic mining experiment. The results show that the pressure and the yield of single-hole model decrease exponentially with time. Based on the material balance theory, a single-hole reservoir pressure and yield decreasing model is established. Using this decreasing model, the pressure and yield of the single-hole model can be calculated effectively. The relative error of the verification of the original volume of the cave is 4.23%, which proves the validity and rationality of this model.