Abstract: To accurately recover the hydrocarbon loss in rock cuttings is a crucial step for the evaluation of reservoir and flooded oil layer during oilfield exploration and reservoir development by using pyrolysis geochemistry logging.However,it is very difficult to determine the recovering coefficients,because there are many causes for the loss of hydrocarbon in rock cutting.A new method for determining pyrolysis parameters of rock cutting,namely critical point analysis, was proposed.The first step of this method is to find the critical point by drawing the scatter plot of hydrocarbon content versus the ratio of light hydrocarbon content to heavy hydrocarbon content.The second step is to calculate the recovering coefficient by contrasting the pyrolysis parameters in the critical points of different types of analyzed samples.This method has been interpreted reasonably in the term of theory and applied in Huanghua Depression.A good effectiveness has been achieved.

Key words: rock cutting, pyrolysis parameters, geochemistry, logging data, reservoir evaluation, hydrocarbon loss, critical point analysis

摘要： 在利用岩屑地化录井资料进行油层产液性质评价的过程中,准确地确定岩屑中的烃类损失是一个非常关键的环节.由于引起岩屑烃类损失的因素较多,使恢复系数的确定异常困难.针对这一问题,提出了一种临界点分析法.首先利用烃类组分含量与轻重组分含量比值之间的关系,确定出两者关系变化的拐点,称为临界点;进而对比不同类型分析样品临界点对应的热解参数,最后可确定恢复系数.该方法不仅从理论上得到了科学的解释,而且在实际应用中取得了较好的效果.

关键词: 岩屑, 热解参数, 地球化学, 录井资料, 储层评价, 烃类损失, 临界点分析法