华池地区长8段致密油储层品质定量评价方法

Quantitative Evaluation Method of Tight Oil Reservoir Quality of Chang 8 Member in Huachi Area

鄂尔多斯盆地华池地区长8段属于低孔隙度低渗透率致密油储层,其复杂的孔隙结构使得储层参数计算精度低,定性的储层品质分类方法不能满足精细解释需求,需要开展储层品质定量评价,提高致密油储层解释符合率。通过岩石物理实验资料与试油资料建立储层品质分类标准,基于岩石物理实验资料与核磁共振测井资料建立孔隙度、渗透率、中值孔喉半径、排驱压力、分选系数、孔喉半径均值的测井解释模型,采用主成分分析法确定测井解释参数的权重系数,经归一化处理后构建储层品质综合评价指数。应用结果表明,该方法能够定量评价致密油储层品质级别,储层品质定量计算结果与试油产量吻合,具有一定的推广应用价值。

Chang 8 member in Huachi area of Ordos basin belongs to low porosity and low permeability tight oil reservoir.Its complex pore structure makes the calculation precision of reservoir parameters low,and the qualitative classification method of reservoir quality cannot satisfy the fine interpretation requirements.Therefore,it is necessary to carry out quantitative evaluation of reservoir quality to improve the interpretation coincidence rate of tight oil reservoir.The classification standard of reservoir quality is established through petrophysical experiment analysis data and oil test data.Based on petrophysical experiment data and nuclear magnetic logging data,logging interpretation models of porosity,permeability,median radius of pore throat,displacement pressure,sorting coefficient and mean radius of pore throat are established.Principal component analysis method is used to determine the weight coefficient of logging interpretation parameters.After normalized treatment,the comprehensive evaluation index of reservoir quality is constructed.The application results show that this method can quantitatively evaluate the quality level of tight oil reservoir,and the quantitative calculation results of reservoir quality are consistent with the test oil production,which has certain application value.