摘要:
沙雅隆起经历了多期构造活动和长期岩溶作用的改造,形成分布极不均匀的裂缝、孔洞系统,构成了奥陶系碳酸盐岩储层的主要储集空间,在沙雅隆起奥陶系碳酸盐岩地层沉积、成岩之后,经历了加里东期—印支期—燕山期多次构造抬升、暴露、剥蚀和岩溶作用,形成了区内广泛分布的风化壳型岩溶作用。研究区至少发育4期岩溶作用,即加里东中晚期,海西早期,海西晚期和印支期—燕山期,其中海西早期和海西晚期是岩溶发育的主要时期。岩溶作用对奥陶系碳酸盐岩储层的形成和分布具有重要的控制作用,其储层发育层段限制在岩溶作用影响深度范围内。
Abstract:
The multiphase tectonic events and long term karstification are responsible for the formation of the uneven fissure and pore space systems as main storage spaces of the Ordovician carbonate reservoirs in the Xayar uplift in Xinjiang. Following the deposition and diagenesis of the Ordovician carbonate sediments, there occurred the Caledonian-Indosinian-Yanshanian tectonic uplifting, exposure, erosion, karstification, leading to the appearance of the widespread weathering-type karstification. Four stages of karstification have been distinguished:middle and late Caledonian, early Hercynian, late Hercynian and Indosinian-Yanshanian, of which early and late Hercynian are considered to be most important stages of karstification. The karstification is believed to control the formation and distribution of the Ordovician carbonate reservoirs.
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