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基于野外地质调查及采集样品的微观分析,文中详细研究了新疆乌苏地区新近系发育的石膏脉特征,并从古沉积环境、成岩作用、风化作用和溶盐水注入期次等方面分析了石膏脉的形成过程。该区石膏脉发育形态特殊,主要是由两横两纵4条线状主控石膏脉派生出的各种产状石膏脉组成,呈龟壳状。通过分析认为该石膏脉的形成过程共经历过4个阶段,炎热的古沉积环境为沉积大量的石膏矿物奠定了基础,先成岩后胶结的成岩作用为石膏脉形成提供了必要条件,加上强烈的风化作用和多期地表溶盐水注入和析出,形成了现今的龟壳状结构石膏脉。该套石膏脉的存在为推测盆地中心可能存在天然储层裂缝改造区提供线索,并对西北地区新近纪干旱沉积环境具有一定的指示意义。
Based on the field geological survey and the microscopic analysis of collected samples, the gypsum vein characteristics of Neogene developed in Wusu area of Xinjiang Autonomous Region were studied in detail. The characteristics of gypsum vein were analyzed from the aspects of paleodial depositional environment, diagenesis, weathering and salt injection period The formation of the process. This area gypsum pulse developmental morphology is special, mainly by two horizontal and two longitudinal 4 line gypsum master-line control derived from various forms of gypsum-like veins, was shell-shaped. Through analyzing that the formation process of the gypsum vein has gone through four stages in total, the hot paleo-sedimentary environment laid the foundation for the deposition of a large number of gypsum minerals. The diagenesis of cementation after pre-diagenesis provided the necessary conditions for the formation of gypsum veins, Weathering and multi-phase surface water solution injection and precipitation, the formation of today’s shell-shaped structure gypsum pulse. The set of gypsum veins provide clues to speculate that there may be natural fractures in the center of the basin and are of some indication to the Neogene arid depositional environment in the northwestern China.