储层宏观非均质性研究——以吉林油田大208区黑帝庙油层为例

储层非均质性是影响油气藏中油、气、水渗流及油气采收率的主要内因。进行储层非均质研究,对查明油藏剩余油分布、采取合理注采措施、提高采收率显得十分必要。以吉林油田大208区黑帝庙油层三角洲前缘亚相储层为例,采用隔夹层识别对比、沉积微相分析、地质统计学系数和劳伦兹系数方法分析了层间、层内和平面非均质性。研究表明:黑帝庙油层发育3套稳定隔层,据此可划分为3套开发层系;夹层在各单砂体中比较发育,应将夹层分割的注采井归为不同注采井网;非均质性受沉积微相影响明显,水下分流河道和河口坝微相的非均质性最强;地质统计学参数和劳伦兹系数研究表明,黑帝庙油层10个单砂体均为极强的非均质性,统计学参数往往偏离强非均质标准甚远,而劳伦兹参数值分布于0～1间,更能直观定量的表现出储层宏观非均质性强弱。

The study of the macroscopic heterogeneity of reservoir: Taking the Heidimiao reservoir of Da 208 block in Jilin Oilfield as an example

Reservoir heterogeneity is the main internal factors that impact the reservoirs of oil,gas,water seepage and the oil and gas recovery. The study of reservoir heterogeneity is very necessary for making clear the distribution of remaining oil,taking reasonable injection-production measures and improving the recovery. Taking the Da 208 Heidimiao oil formation delta front subfacies of Jilin Oilfield as an example,the interlayer heterogeneity and in-layer heterogeneity and plane heterogeneity were analyzed with the method of recognizing and comparing the barriers and interlayers,sedimentary microfacies analysis,geostatistical parameters,and Lorentz coefficient. The study shows that the Heidimiao reservoir develops three sets of stability barriers,which can be divided into 3 layer series of development; the interlayers develop in the all single sands,the injection-production wells that the interlayers divided should be classified as different well pattern; the heterogeneity is obviously impacted by sedimentary microfacies,the heterogeneity of subsea river channel and mouth bar microfacies is the strongest; the studies of geostatistical parameters and Lorentz coefficient have shown that Heidimiao reservoir 10 single sands are highly heterogeneous,and statistical parameters often deviate from the strong heterogeneous standard far,while the Lorentz parameter values distribute between 0 and 1,more intuitive and quantitative to show the strong and weak of the macroscopic heterogeneity of reservoir.