低阻储层岩石物性研究

利用常规测井资料，对一般储集层进行评价是很有效的，但是要利用这些常规测井资料准确评价低阻油气储集层的岩石物理参数却十分困难，低阻油气储集层在常规测井资料上显示为水层特征，但开采出来却得到无水的油气。因此，很难用常规测井资料准确地确定低阻储集层的含油气性质。利用核磁共振测井（NMR）评价低阻储集层的岩石类型、孔隙度、自由水以及束缚水等岩石物性参数。实际结果表明，核磁共振测井是评价低阻油气储集层的一种新型而且有效的现代测井方法。

Study on Petrophysical Properties of Low-resistivity Reservoirs

The combined use of conventional logs such as density, neutron and resistivity logs has been proven very effective in evaluating normal reservoirs. An accurate determination of the petrophysical parameters with the conventional logs for low resistivity reservoirs, however, is very difficult. This paper presents two cases of low resistivity reservoirs and low contrast resistivity reservoirs where conventional logging interpretation shows water zones, yet water free hydrocarbons would be produced. Nuclear Magnetic Resonance (NMR) has been available only as a supplement tool, to provide additional information on the productivity of the reservoir. This paper shows that in the case of low resistivity contrast reservoirs NMR is a very cost effective tool for helping accurately determine petrophysical properties of the reservoir.