致密油储层常规测井系列适应性评价研究

致密油储层岩性细、物性差和非均质性强等特点,使有效储层与非储层、油层与水层、工业产层与低产层的测井响应特征差异非常小,测井对比度低。通过孔隙度测井和电阻率测井系列的适应性分析,提出了适应致密油储层的测井仪器精度要求,并在现有测井仪器精度条件下,发展了满足非均质和非线性要求的解释模型:选取自然伽马(GR)、声波时差(AC)、密度(DEN)和电阻率(Rt)四条测井曲线,采用模糊综合聚类方法建立了高精度的孔隙度和渗透率解释模型,结合核磁共振测井资料,建立了可变岩电参数饱和度修正模型,提高了储层参数解释精度。

Adaptability analysis of conventional logging series for tight oil reserviors

Tight oil reservoir has many characteristics such as fine lithology,poor physical property,strong heterogenei-ty,which lead to small difference and low contrast in log responses between effective and non - reservoir,oil and water res-ervoir,industrial and low - yielding reservoir. Based on the adaptability analysis of porosity and resistivity logging series, demands on the accuracy rating of the logging tool for tight oil reservoirs were set,the interpretation model,which can satis-fy the heterogeneity and nonlinear,was built under the current precision of logging tools. By using the method of fuzzy com-prehensive evaluation,GR,AC,DEN and RT curves were selected to establish the high precision porosity and permeability model. Combined with the nuclear magnetic resonance data,the rock - electric parameters saturation correction model was built to improve the interpretation accuracy of the reservoir parameters.