老君庙M层沉积特征及储层非均质性研究

Reserch on the Sedimentary Characteristics and Reservior Heterogeneity of M-layer of Laojunmiao Oilfield

Ｍ油层为一厚层块状砂岩油藏。由于沉积环境的影响，沉积物颗粒分选性较差，岩相变化快，加之后期成岩作用的差异，造成了油层平面井间和剖面层间的非均质性。本文以酒西盆地老君庙油田Ｍ油藏为研究对象，在分析储层沉积特征的基础上，运用多种统计方法对不同级别储层单元内渗透率的垂直和平面非均质性进行了研究，探讨了Ｍ油藏全层和小层的非均质性特征及其影响因素。

M-reservoir of Laojunmiao oilfield in Jiuquan Basin, Gansu province, is of Neogene massive sandstone. M-layer is mainly a braided stream factes, composed wholly of sandstones of different grain size without complete clayey intercalation, Under the influence of sedimentary environment, poorly sorted grain, the variations of factes and lithogenesis, heterogeneity is present both in general and on lateral or vertical profile, based on the analysis of the characteristics of the M -layer deposits, a variety of statistic methods have been used to evaluate the heterogeneity on different scale. On the whole, heterogenerity is very severe for each reservior unit. The content of cement and fine silt, the sorting coefficient are the facters which produce mainly impact on the heterogenerity of M -reservior.