西峰油田董志区长8_1储层层内非均质特征

Characteristics in Layer Heteroceneity in Chang 8_1 Reservoir,Dongzhi Region,Xifeng Oilfield

通过对长81储层渗透率非均质参数的定量计算、以测井资料为基础,结合已有资料,对长81层内夹层的类型和分布特征以及层内裂缝分布特征做了研究,认为长81各小层非均质性都比较严重,夹层类型以泥质夹层和钙质夹层为主,而由钙质胶结形成的致密油层和致密干层分布较广,是影响油藏开发效果的一个重要因素。长81各小层变异系数差别比较大,说明长81储层存在着明显的高渗带和致密带,也可以导致某些油井含水快速上升。

Through quantitative calculation on aeolotroplc parameters of reservoir permeability in the area of Chang 81, based on the well logging data and available information, we studied the form and pattern of intraformational bed and split pattern of the area. One result suggests that it is grave in layer heterogeneity of Chang 8~ reservoir, and the main interlayer types are muddy intercalation and calcareeous intercalation, compact oil reservoir and compact dry layer whieh are formated by ealeareeous eement have a wide distribution, and they play an important role in effeet of reservoir development.The other result implies that the variation eoeffieien has a big differenee between every sublayer of Chang 81 reservoir. It shows that there are elear high permeability zone and eompaet zone, whieh ean make water eut rising in some oil wells.