关键词: 火成岩, 应力敏感性, 储层伤害, 有效应力

Abstract: The core samples of igneous rock formations with low permeability and low porosity in Jilin Changshen well block are tested for their pressure sensitivity. The result shows that permeability recovery rate of these samples is not more than 11%, which indicates high pressure sensitivity of the formations. By observing core samples and comparing the result of pressure sensitivity tests with those from igneous rock core samples of other regions, it shows that the pressure sensitivity of igneous rock formations is relevant to lithology, structure, construction, development and type of porosity and fracture. Different from the unitary diagenesis of sandstone, the complex diagenesis of igneous rock leads to different pressure sensitivity in different areas. Therefore the pressure sensitivity of different igneous rock formations should be treated differently. Meanwhile, pressure sensitivity of a certain well may not be the same in different igneous layers.

Key words: igneous rock, pressure sensitivity, reservoir damage, effective stress