排烃定量研究

Quantification of hydrocarbon expulsion

介绍了两种排烃定量方法。一种基于生、排烃物理模拟并通过试验残渣的沥青分析、热解分析数据计算排烃量和排烃率,并回归出腐泥型生油岩排烃率与镜质体反射率关系式;另一种通过若干热解热模拟试验样品的氢指数、有机碳衰减轨迹建立原始氢指数恢复图版和有机碳恢复图版并求取排烃量和排烃率。前一种方法被用于平面排烃定量,后一种方法被用于剖面排烃定量。研究表明,排烃率差异主要发生在层段之间,与疏导层距离无关,排烃段对应声波时差曲线"负凹",未排段对应声波时差曲线"高峰"。排烃率与生烃率、演化程度成正比,与残留烃碳比成反比。

Two quantitative methods of hydrocarbon expulsion were proposed in this paper.One is based on physical simulations of hydrocarbon expulsion,and data of asphalt content and pyrolysis of experimental residue.The quantity and efficiency of expulsion was calculated by this method.And relation between rate of expulsion hydrocarbon of sapropel-type source rocks and vitrinite reflectance was also regressed.The other one can gain the quantity and rate of expulsion hydrocarbon by index comeback charts of original hydrogen and organic carbon,which were established by decay track of hydrogen index and organic carbon obtained in pyrolysis-thermal experiments of many samples.The former method is used for the quantitative hydrocarbon expulsion of plane,and the later one is used for that of profile.It is confirmed that the differentiation of the expulsing rat is mainly between neighboring intervals and independent of the distance from source rocks to reservoirs.The expulsion-hydrocarbon source rock is corresponding with negative and hollow of time-difference curve of acoustic wave,the non expulsion-hydrocarbon source rock is corresponding with the one＇s peak,and the expulsing efficiency is in direct ratio to generating-hydrocarbon efficiency and degree of thermal evolution,but is in reverse ratio to ratio of the residual hydrocarbon-carbon.