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准噶尔盆地火山岩油气藏埋藏深、岩石类型复杂、裂缝较为发育,属于典型的裂缝型储层。为研究火山岩气藏开发过程中储层的物性变化规律,弄清裂缝的产状与应力敏感性之间的相互关系,从不同火山岩岩性的岩心图像入手,通过对岩心裂缝进行可视化描述,在弄清裂缝发育特征和产状的基础上,对研究区内5口丼20多块岩心样品进行渗透率应力敏感性实验研究和分析。通过对不同裂缝产状的岩心应力敏感性实验研究可知,火山岩储层的应力敏感性不仅与裂缝的发育程度有关,而且与裂缝的产状紧密相关。低角度缝较发育的具有网状缝系统岩心的应力敏感性最强,高角度缝岩心的次之,直劈缝岩心的则相对较弱。
The volcanic reservoirs in the Junggar Basin are buried deep, with complex rock types and relatively developed fractures, which are typical fractured reservoirs. In order to study the variation law of physical properties of reservoirs during the development of volcanic gas reservoirs, and to find out the relationship between the occurrence and stress sensitivity of fractures, starting from the core images of different volcanic lithologies, by visualizing the core fractures, On the basis of understanding the characteristics of fracture development and occurrence, the permeability stress sensitivity experiment of more than 20 core samples from 5 mouths in the study area was studied and analyzed. Through the experimental study on core stress sensitivity of different fracture occurrences, the stress sensitivity of volcanic reservoirs is not only related to the degree of fracture development, but also closely related to the occurrence of fractures. The stress sensitivity of the reticulated seam system with the more developed low angle seam is the strongest, followed by the high angle seam core, and the straight cleave core is relatively weak.