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本文结合牛庄洼陷地质特征,剖析了前人关于双孔隙度法、碳氧比法、自然伽马法以及ΔLogR法在该地区烃源岩TOC测井评价的适应性,认为这些方法由于与该地区的岩性特征、方法固有参数及基线选取的误差等关联,使得烃源岩TOC测井评价的精度不高甚至根本不适合.依据牛庄洼陷地区的实测TOC和测井资料,本文通过构建TOC含量与自然伽马、声波时差以及电阻率的关系,从而形成了一套适合本地区且操作方便的测井多参数改进计算模型.结果表明,改进模型TOC的计算值与实测值之间绝对误差小于0.4的点占总数的91.7%,证实该模型求取牛庄洼陷烃源岩TOC值的准确性和可靠性.改进后的模型为牛庄洼陷烃源岩TOC测井评价提供了一种新的方法,具有良好的应用前景.
Based on the geological characteristics of Niuzhuang Sag, the authors analyzed the adaptability of TOC log evaluation of source rock in this area based on the dual porosity method, carbon and oxygen ratio method, natural gamma ray method and ΔLogR method. The lithology characteristics, intrinsic parameters of the method and errors of the baseline selection make the accuracy of TOC logging evaluation of source rocks not high or even unsuitable.According to the measured TOC and logging data in Niuzhuang depression, By constructing the relationship between TOC content and natural gamma ray, acoustic time difference and electrical resistivity, a set of improved multi-parameter logistic calculation model is developed that is suitable for the local area and easy to operate. The results show that the calculated value of TOC and the measured value The absolute error is less than 0.4, accounting for 91.7% of the total, confirming the accuracy and reliability of the model for calculating TOC values of source rocks in Niuzhuang depression.The improved model is used for TOC logging evaluation of source rocks in Niuzhuang sub-sag Provides a new method, has good application prospects.