龙马溪页岩物理参数测量与分析

Measurement and Analysis of Physical Parameters of Shale of Longmaxi Area

摘要: 导电性和介电性是储层的两大电学基础性质。传统电法在非常规储层的勘探和开发中，越来越不能适应现场作业要求，而岩石的介电性能在致密储层中更加明显。本文主要内容为运用页岩岩心模拟井眼环境，在实验室环境下，进行不同岩心的阻容参数的测量，根据对测量数据的分析得出岩心物性的双电规律。实验表明，页岩电阻率和电容率随着频率的增加而降低，但其电容率参数的频散效应比同条件下的电阻率参数频散效应显著。研究发现，不同的频率段，岩石的阻容频散特征是存在差异的，1 Hz~10 kHz，电容率变化量大，10 kHz~100 kHz，电容率的变化量小。研究还发现，岩心电容率的频散与岩心的饱和度有密切关系，对于同一块岩心，含水饱和度越大，频散效应越明显。最后，统计岩心双电数据与含水饱和度的规律，为评价饱和度提供一种新的途径。

Abstract: Electrical conductivity and dielectric are the basic properties of the reservoir. In the exploration and development of unconventional reservoir, the conventional electric method cannot adapt to the requirements of field operation, and the dielectric properties of the rock are more obvious in the dense reservoir. In this paper, the main content for the use of shale borehole core simulation environment, under the laboratory environment, different parameters of the core of resistance capacity measurement, based on the analysis of measured data regularity of electric double core physical properties. The experimental results show that the resistivity and capacitance of shale are decreased with the increase of frequency, but the dispersion effect of the capacitance parameter is higher than that in the same condition. The study found that different frequency bands have different characteristics of the resistance of rock, 1 Hz - 10 kHz, the change of capacitance rate is large, 10 kHz - 100 kHz, and the change in capacitance rate is small. The study also found that the frequency dispersion of core capacitance is closely related to the saturation of core, and the larger the water saturation of the same core, the more obvious the dispersion effect is. Finally, the statistics of core data and water saturation are used to provide a new way to evaluate saturation.