低孔渗含钙砂泥岩薄互层电阻率求真处理方法

【作者】 王琳琳；

【导师】 刘江；

【作者基本信息】 黑龙江大学 ， 应用数学， 2008， 硕士

【摘要】 由于大庆长垣以西地区萨尔图、高台子油层具有典型的含泥含钙、砂泥薄互出现的特点,一般单层厚度小于1m,薄互层内砂岩厚度小于0.4m,超出了各种测井方法的垂向分辨能力,加之含泥含钙,致使油水层解释尤其是水淹层解释符合率一直处于较低水平。针对油田具体特点,通过理论与经验校正方法相结合,开展双侧向电阻率层厚围岩校正、井眼校正、岩性校正,突出电阻率与储层流体内在关系,达到较准确评价油水层的目的。本文给出的电阻率校正方法首先采用理论校正图版消除侧向测井井眼泥浆分流影响,进而以密闭取芯井的岩石物理实验资料为基础,建立有效孔隙度、钙质含量、泥质含量、胶结指数、含水饱和度计算模型.最终通过回归分析手段建立起岩心分析含水饱和度与储层电阻率、泥质含量、钙质含量、层厚、围岩电阻率、地层水电阻率关系方程,从侧向测井原理出发确定了各种地质参数、环境参数对测井响应的贡献大小,实现电阻率测井的岩性校正、层厚围岩校正。以经典的阿尔奇模型为桥梁,检验校正方法的校正效果。经实际资料检验,校正后电阻率计算含水饱和度平均绝对误差达到5.48pu。,平均相对误差8.75%,较校正前计算含水饱和度分别提高了2.83pu。及4.15个百分点,对提高油水层解释符合率,尤其水淹层解释符合率具有非常重要意义。更多还原

【Abstract】 In west of Daqing Changyuan , Saertu and Gaotaizi oil layers contain clay shale and calcium, sand and shale in reservoir have thin mutually characteristic, and because the thickness of thin interbed layer is is smaller than 0.4m, has surpassed the resolution of each kind of well logging method, causing the explanation coincidence rate of interpretation continuously to be in a lower level , particular in water-flooded zones. Based on the characteristic and basic theory for logging interpretation, combined with the experience of correction method, this article develops formation thickness and the adjacent formation correction, the borehole correction, the lithological correction of the dual laterolog, prominenting electronic resistivity and the reservoir fluid intrinsic relations, achieved the goal of evaluating reservoir accurately.the electronic resistivity correction method firstly uses the theory correction chart to eliminate the mud divergence influence, and this article establishes the calcareous content, the shale content, the effective porosity, the cementation exponent, the water saturation computation model through petrophysics experimental data of sealing core, Finally establishes the core sample analysis water saturation and the reservoir electronic resistivity, the shale content, the calcareous content, the adjacent formation electronic resistivity, the resistivity of the formation water relations equation. Based the laterolog principle, it had determined the contribution of each geological parameter, the environment parameter to the log response, achieved formation thickness and the adjacent formation correction, the lithological correction. Taking the classics Archie’s formula , the examinated the effect of correction. After the actual material examination, the average absolute error of computing the water saturation achieved 5.48pu. the average relative error achieved 8.75it have much significance in enhancing the explanation coincidence rate, especially in the explanation of water-flooded zones.更多还原