机械式野外用微型渗透率仪及其在石油地质研究中的应用

MECHANICAL FIELD PERMEAMETER AND ITS APPLICATION IN PETROLEUM GEOLOGY

依据达西定律，研制了机械式野外用微型渗透率仅（MFP）。MFP携带方便，可系统测量岩石的渗透率，对测量对象不具损坏性，既便于野外测量露头岩石，也适于在实验室测量手标本或若心。MFP由承压气源、调制器和注气探头3部分装置组成，通过闭合作用在测量对象表面的探头，将高压气体注入岩石，测得透过岩石作用面的气体流量和相应压力，再据渗透率与它们的关系换算出渗透率数据。根据经验，用MFP每天可测量400～500个点的数据，可快速获得密点集渗透率空间分布数据，非常便于在野外按地层进行复杂砂体的渗透率分布研究。数据误差分析表明，用MFP方法获得的渗透率数据误差属随机性误差。以对吐哈盆地七克台剖面露头砂体的研究为例，介绍了MFP在研究砂体渗透率非均质性特征及模式方面的实际应用效果。

According to Darcy's law, the authors developed a mechanical field permeameter (MFP), which is easy to be carried with anduseful in systematical measurement of rock permeability, not only for the outcrop rocks but also for hand specimens or coresin laboratory. MFP is composed of three parts, which are pressured gas source, modulator and gas probe, respectively. Itmakes the high pressured gas pour into the rocks by the probe closed to the surface of the measured object, records the gasflow rate and pressure when penetrating the rock surface and finally gets the permeability value based on the relationshipamong them. MFP has been used to measure 400-500 experimental data each day so as to acquire concentrated distribution da-ta of permeability quickly, hence it is convenient to study the permeability distribution of complicated sand bodies at outcrop.The analysis of data error dernonstrates that permeability error from the MFP is random-dependent. Taking the sand body inQiktim outcrop in Turpan-Hami basin as an example, this paper presents MFP's application in the study of the characteristicsof permeability heterogeneity and pattern.