储层因子在疏松砂岩油藏采收率预测中的应用

Application of reservoir factor to forecasting the recovery efficiency of unconsolidat-ed sandstone reservoirs.

由于在油田勘探后期上报的探明可采储量直接影响上市公司融资效果,因此探明储量采收率的标定就显得尤为重要。通过收集并整理胜利油区高开发程度油田开发样本以及采收率影响因素的分析,发现对疏松砂岩油藏而言,孔隙度与采收率呈正相关关系;而对于固结砂岩油藏而言,孔隙度与采收率没有直接关系。于是提出了反映储集层参数的因素--储层因子,该因素是储集层渗透率与孔隙度的函数。应用储层因子可有效反映储集层性质对采收率的影响,而且可明显提高高开发程度疏松砂岩油藏采收率的计算精度。

Because the proved recoverable reserves at later period of oil-gas exploration can directly influence the circulating funds of the companies on the market, so the calibrating the recovery efficiency of the proved reserves appeared important especially. Through collecting and collating the samples of high -developed oilfields in Shengli petroliferous province and analyzing the influencing factors of recovery efficiency, it was found that porosity was in normal correlation to recover-y efficiency in the unconsolidated sandstone reservoirs and they had no directly relation in consolidated sandstone reservoirs. So the reservoir factor reflecting the reservoir parameters was brought forward. It is a function of porosity and permeability. Applying the reservoir factor can reflect the effect of reservoir characteristics on recovery efficiency and can obviously increase precision in calculating the recovery efficiency of the high-developed unconsolidated sandstone reservoirs.