岩石热解热失重法计算砂岩储集层含油饱和度

Calculate oil saturation of sandstone reservoir by thermal decomposition weightlessness method of rock pyrolysis.

含油饱和度是储集层解释评价中一项非常重要的参数,可为储集层解释评价提供数据支持。以岩石热解录井技术为基础,通过对多口井的岩心、井壁取心的岩石热解分析,利用地化样品热解前后的质量变化,推导出砂岩储集层的含油饱和度公式,该方法操作简单,只要在进行岩石热解分析时将分析前和分析后的质量用天平称出即可,然后通过前后质量的差值计算出含油饱和度。实例证明,热失重法与室内分析含油饱和度的原理相同,与测井、核磁录井测定的含油饱和度数值接近,该方法是一种既经济、又快速的计算砂岩储集层含油饱和度的方法。岩石热解录井热失重法计算含油饱和度方法可以填补岩石热解录井在储集层物性分析中对含油饱和度计算的空白与不足,对于提高录井储集层解释评价水平具有重要的实践意义。

Oil saturation is one of very important parameters in reservoir interpretation and evaluation and it can provide data support for reservoir interpretation and evaluation.Taking rock pyrolysis logging technology as the basis,through the rock pyrolysis analysis of multiwell core and sidewall coring,by using the mass changes of geochemical samples before and after thermal decomposition,the authors derived oil saturation formula of sandstone reservoir.The method is simple,which just weighs the mass pre-and-post analysis with the balance in rock pyrolysis,then calculats oil saturation by the difference in pre-and-post mass.Examples proved that the principle of thermal decomposition weightlessness is the same as that of laboratory analysis on oil saturation and nearing oil saturation measured with wireline logging and NMR logging,it is a rapid and economic method to calculate oil saturation of sandstone reservoir.The method of calculating oil saturation by rock pyrolysis logging can fill the gap in oil saturation calculation during reservoir physical property analysis of rock thermal pyrolysis logging.It has an important practical significance for improving the level of reservoir interpretation and evaluation of mud logging.