天然气盖层实验研究及评价

The Experimental Study and Evaluation of Roofrock of Natural Gas

盖层是烃类聚集的必要条件.排替压力则是评价盖层的关键参数.本文主要通过泥质岩的实验研究,着重分析了突破压力与突破时间的关系。根据它们之间一定的函数关系.提出了求取岩石排替压力的方法,并且通过实验和实际资料的研究提出了盖层分级评价的标准。

Roofrock is the prerequisite for the accumulation of light hydrocarbon, and displacement pressure is one of the key parameters in roofrock evaluation. In the past, because of the time penetrating through clay rock was neglected, the calculated-pressure penetrating through clay rock was too large to accord with the true displacement pressure of rock. This paper deals with the relationship between pressure and time penetralting through clay rock. It shows that time penetrating through clay rock relates to that of pressure functionly. The method of getting rock displacement pressure is also studied mainly through experiments on clay rock and it is proved that the method is effective and practical. According to experimental results and practical data, the criterion for roofrock evaluation of natural gas is put forward. The evaluation table may give accordance to evaluate the prospect of a region.