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页岩厚度、总有机碳含量、脆性矿物含量、物性等是页岩储层评价的关键参数,明显受其沉积环境控制。因此,分析页岩形成过程中的沉积环境对页岩储层评价和甜点预测具有重要意义。系统测试了鄂尔多斯盆地中南部Y1井钻遇的张家滩页岩525组样品的40余种元素丰度,分析了其元素地球化学特征和页岩沉积环境的古气候、古水深、古盐度、古生产力、氧化还原特征。结果表明,自下而上张家滩页岩元素的丰度和比值呈周期性变化,指示其形成于温暖湿润、淡水—微咸水、缺氧等沉积环境,其中4单元发育在最潮湿的沉积环境,当时的水体最深、还原性最高,具有较高的古生产力。
Shale thickness, total organic carbon content, brittle mineral content and physical properties are the key parameters for evaluation of shale reservoirs and are obviously controlled by their sedimentary environment. Therefore, it is important to analyze the sedimentary environment during shale formation on shale reservoir evaluation and dessert prediction. More than 40 elemental abundances of 525 samples from the Zhangjiadan shale encountered during the Y1 well drilling in central-southern Ordos Basin were systematically tested. The elemental geochemical characteristics and palaeoclimate, shale depth and salinity , Ancient productivity, redox characteristics The results show that the abundance and ratio of shale elements in Zhangjiathang shale periodically change, indicating that they formed in the depositional environment of warm and humid, freshwater - brackish water, anoxic, etc., of which 4 units developed in the most humid Sedimentary environment, when the deepest body of water, the highest reduction, with a high ancient productivity.