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构造成岩作用是控制天然裂缝形成、分布及其有效性演化规律的主要因素,对预测有效裂缝分布规律具有重要意义.为了阐明构造成岩作用对有效裂缝的控制作用,根据野外露头、岩心以及薄片等资料,对库车前陆盆地白垩系致密砂岩储层裂缝的成因类型、有效性及其分布规律进行了分析,结合研究区构造演化和成岩作用分析,讨论了构造成岩作用对裂缝发育程度和有效性的影响.认为研究区发育有构造裂缝和成岩裂缝,以构造裂缝为主,裂缝发育程度主要受沉积微相、构造变形强度和成岩相控制.结果表明:研究区从北部的克拉苏构造带向南至前缘隆起带,裂缝的发育程度逐渐降低,但有效性却逐渐变好,说明裂缝发育程度和其有效性是受不同因素控制的,构造变形时间、后期构造抬升剥蚀作用、现今应力场方向、胶结作用以及溶蚀作用等是影响裂缝有效性的主要因素.
The structure diagenesis is the main factor controlling the formation and distribution of natural fractures and the evolution of their effectiveness, which is of great significance to predict the distribution of effective fractures.In order to clarify the controlling effect of tectonic diagenesis on effective fractures, according to the field outcrops, cores and thin slices , The types of fractures, their validity and their distribution in the Cretaceous tight sandstone reservoirs in the Kuqa foreland basin are analyzed. According to the tectonic evolution and diagenesis analysis of the study area, the degree and effectiveness of tectonic diagenesis on fracture development are discussed It is considered that structural fractures and diagenetic fractures are developed in the study area, mainly structural fractures, and the degree of fracture development is mainly controlled by sedimentary microfacies, tectonic deformation intensity and diagenetic facies.The results show that: from the northern Kelasu tectonic belt From south to the uplift zone, the development of fractures gradually decreases, but the effectiveness gradually becomes better, which shows that the degree of fracture development and its effectiveness are controlled by different factors. The deformation time and tectonic uplift and denudation in the later period are the most important factors Field direction, cementation and dissolution are the main factors affecting the effectiveness of the fracture .