物理吸附轻烃的录井技术及其石油地质意义

油气藏中的轻烃在向上运移的过程中必然要被岩石颗粒表面吸附，从而留下了具有一定特征的运移印迹。分析岩石中颗粒表面物理吸附轻烃的特征，就可以对样品所对应地层及下伏地层的含油气性作出评价和预测。全面考虑钻井和采样过程中轻烃各组分赋存状态和含量的变化，选择了轻烃湿度值（ Ｗｈ） 、轻烃平衡值（ Ｂｈ） 、轻烃特征值（ Ｃｈ） 、Ｃ２ —Ｃ４ 含量、Ｃ５ —Ｃ７ 含量、Ｃ１／ｎＣ４ 、ｉＣ４／ｎＣ４ 、ｉＣ５／ｎＣ５ 、Ｃ２／（Ｃ１ ＋ Ｃ２ ＋ Ｃ３ ＋ Ｃ４ ＋ Ｃ５） 、Ｃ３／（Ｃ１ ＋ Ｃ２ ＋ Ｃ３ ＋ Ｃ４ ＋ Ｃ５） 、ｎＣ４／（Ｃ１ ＋ Ｃ２ ＋ Ｃ３ ＋ Ｃ４ ＋ Ｃ５）等１１ 项参数，用于在钻井过程中预测油气层、判别油气层类型、评价油气层质量和确定储集层的上、下界面。应用效果表明，物理吸附轻烃录井技术快速、准确、经济，具有很好的应用前景。

Logging technology of geophysically absorbed light hydrocarbons and its petroleum geological significance.

Some of the light hydrocarbons migrated from the oil and gas reservoirs well certainly be absorbed by the soil substrate during migration and leaves some migrating traces with significant characteristics behind them. Thus the evaluation and prediction of the hydrocarbon potentials below can be made by means of analyzing the characteristics of the geophysical absorbed light hydrocarbons. A complete consideration of the change of the state of occurrence and content of different components in light hydrocarbons during the drilling and sampling process, wetness of light hydrocarbons ( W h), balancing point of light hydrocarbons ( B h), characteristics of light hydrocarbons ( C h), contents of C 2 C 4, C 5 C 7,C 1/nC 4,iC 4/nC 4,iC 5/nC 5,C 2/(C 1 C 2 C 3 C 4 C 5),C 3/(C 1 C 2 C 3 C 4 C 5),nC 4/(C 1 C 2 C 3 C 4 C 5), etc. 11 items of parameters are used to predict oil/gas beds and identify the type of oil/gas beds, evaluated the quality of reservoir beds and determine the upper and lower limits of oil/gas reservoir beds. Results of application shows that the physically absorbed light hydrocarbon logging technique is rapid, accurate and economic and has a very good forecast in application.