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低孔低渗致密砂岩储层是一种较复杂的储层类型。致密砂岩储层由于其孔渗性差,其产油气能力主要取决于储层中裂缝发育的情况。裂缝不仅可以使孤立的孔洞得以连通。发育成有效的储集空间,大大提高基质渗透率,是油气的主要运移通道更是决定致密砂岩储层产能的关键因素。因此,裂缝发育规律研究已成为提高勘探开发效益所面临的首要问题。本文在了解砂岩裂缝的相关概念以及它的形成机理的基础上研究了声波测井在裂缝储层识别和评价的响应特征。
Low-porosity and low-permeability tight sandstone reservoir is a kind of more complex reservoir type. Tight sandstone reservoirs, because of their poor porosity and permeability, mainly depend on the development of fractures in the reservoir. Cracks not only allow isolated holes to communicate. Developing into an effective reservoir space, greatly increasing the permeability of the matrix, which is the main migration channel for oil and gas, is the key factor that determines the production capacity of tight sandstone reservoirs. Therefore, the research on the law of fracture development has become the primary problem facing the exploration and development benefits. Based on the understanding of the related concepts of sandstone fractures and its formation mechanism, this paper studies the response characteristics of acoustic logging in the identification and evaluation of fractured reservoirs.