论文部分内容阅读
在英买35井区志留系柯坪塔格组上段,针对致密海相石英砂岩储层的成因,结合薄片、包裹体测温、伊利石测年、阴极发光等资料,认为石英砂岩存在4期主要的石英增生:1泥盆纪、石炭纪,来源于寒武系硅质生物遗骸中的硅质增生;2二叠纪火山喷发,来源于寒武系、奥陶系、志留系的硅质大量增生;3三叠纪、侏罗纪地层暴露剥蚀,来源于二叠系凝灰岩的硅质增生;4白垩纪至今地层快速沉降深埋,志留系成岩活动加剧,硅质析出增生。二叠系火成岩喷发提供了石英增生的动力与物源。毗邻二叠系火成岩侵入体的志留系砂岩储层存在热接触变质带和致密胶结带。
In the upper section of the Silurian Kepingtage Formation in Well Ying 35, in view of the origin of the tight marine quartz sandstone reservoir, combined with the data of the temperature of thin slices and inclusions, the illite dating and the cathodoluminescence, it is considered that there are 4 Main quartz accretions: 1 Devonian and Carboniferous, which originated from the siliceous hyperplasia of the Cambrian silicic remains; 2 Permian volcanic eruptions from the Cambrian, Ordovician and Silurian Silurian massively proliferated. 3 Triassic and Jurassic strata were exposed and eroded due to siliceous hyperplasia of Permian tuffs. 4 Cretaceous strata rapidly subsided and buried deeply, Silurian diagenetic activity aggravated and siliceous precipitated hyperplasia. Permian igneous rocks provide the source and source of quartz accretion. The Silurian sandstone reservoirs adjacent to the Permian igneous intrusions have thermal contact metamorphic zones and dense cemented zones.