一种生物气资源量计算新方法

目前国内广泛使用的生物气资源量估算方法是:首先通过模拟实验测定烃源岩生物气产气率,再用类似体积法的计算原理进行生物气生气量估算.这种确定产气率的方法存在两方面的弊端:首先是用实验条件下实验样品的模拟产气率代表实际条件下的产气率;其次是在具体烃源岩与实验样品进行地球化学类比时,很难准确地确定烃源岩属于哪一类.从生物气的生成机理及影响因素出发,量化了部分影响生物气生成的重要因素,将生物气资源量的定量计算归为5个要素:有机质组成因数、氧化还原环境因数、聚集系数、温度因数以及极限产气率,并对每一参数的定量计算方法及影响因素进行了分析.应用该方法对方正断陷实地勘探取得的地质数据进行了计算,得出了该断陷不同地区不同层段生物气资源量.图6表4参11

A new computational method for biogenic gas resources

The widely used method for calculating biogenic gas resources is: through the simulation, the biogas production rate of source rock is determined; the calculation principle similar to volume method is used to estimate the biogas production. There are two disadvantages in this method: under the experimental conditions, the experimental gas production rate is used to represent the actual gas production rate; it is difficult to determine the type of the hydrocarbon source rock by comparing it with experimental samples. From the generation and influencing factors of biogas, this paper quantifies some important factors influencing the biogas generation and determines five elements in the quantificational computing method of biogenic gas which are organic component factor, redox environmental factor, collection coefficient, temperature coefficient, and ultimate gas-forming rate. It also analyzes the quantificational computing method and influencing factors of each parameter. The method was applied to the Fangzheng fault depression and the biogas resource in different layers was calculated.