一种求取碎屑岩储层中粘土总量的新方法

在实验分析的基础上,提出了一种新的求取碎屑岩储层中粘土总量的方法---二级抽提分离+非定向X射线衍射法,即首先用传统的抽提分离法分别提取出粒径小于10μm和10～64μm的微粒,然后用粒径小于10μm微粒的质量加上利用非定向X射线法测出的粒径在10～64μm微粒中粘土部分的质量,就得到该样品中粘土总量。并以WN油田碎屑岩储层为例,具体论述了该法的计算过程及其实际应用效果。研究结果表明,该法具有原理简单、精度高、理论性强、实际应用效果良好的优点,可作为求取沉积岩储层中粘土总量的可靠方法。

A Novel Approach for the Total Amount of Clay in Clastic Reservoirs

On the basis of experimental ana lysis, a new method, twice grain size segregation plus X-ray diffraction of randomly oriented powers of clay minerals, was put forward to calculate the total amount in clastic reservoir rock.Firstly, particles of which radius less than 10μm and 10 to 64μm w are separated from the samples by the way of traditional segregation of clay minerals, and then weigh them respectively. Secondly, the weight of the part of clay minerals in the particles with radius 10 to 64μm can abe available by means of analysis of X-ray diffraction of randomly or-iented powers of clay m ineral. Finally, the first part of clay minerals. weight plus the second part, the total amount of clay of the sample can be obtained. In order to concretely discuss the course and the effect of practical application of the method, clastic reservoirs in WN oil field was introduced. The study result ind icates that themethodment ioned in the paper has simpler principle,higher precision, good theorization and show s a satisfactory effect, so it is a reliab le approach for the total amount of clay in clastic reservoir rocks.