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准噶尔盆地永进地区侏罗系和白垩系之间普遍存在一套以红色为主的砂泥岩地层,其层位归属和成因争议较大。利用地震区域追踪对比、连井标定和砂层组精细对比、岩心观察、粘土矿物、微量元素和化学蚀变指数等多种方法对该层进行了综合研究。研究结果表明,红层层位属中侏罗统西山窑组,主要是沉积作用形成的,红层是半干旱—半潮湿气候条件下的陆上—滨湖浅水环境的产物,而后期的风化作用较小。在该环境下,碎屑岩储层不含炭屑,增强了在成岩过程中的抗压实性,为永进地区6 000m深度依然存在相对高孔渗储层创造了条件,提高了勘探前景的评价,为该区有利储层的评价与预测提供了依据。
A set of sandstone-mudstone formations dominated by red are common between the Jurassic and Cretaceous in the Yongjin area of the Junggar Basin. The strata are attributed to their stratigraphic origin and their genesis. This layer has been comprehensively studied by many methods, such as tracking and contrasting in seismic area, well calibration and sand group correlation, core observation, clay minerals, trace elements and chemical alteration index. The results show that the red beds are formed in the Middle Jurassic Xishanyao Formation and are mainly formed by sedimentation. The red beds are the products of the shallow land-lake environment in semi-arid-semi-humid climates. The later weathering Less effect. Under this circumstance, clastic reservoirs do not contain charcoal and enhance the compaction resistance during diagenesis, which provides conditions for the relatively high porosity and permeability reservoirs at 6,000 m in Yongjin area and enhances exploration prospects The evaluation provides the basis for the evaluation and prediction of favorable reservoirs in this area.