准噶尔盆地中拐-五八区天然气盖层评价研究
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摘要
利用地震层速度和声波速度转换的排替压力只是相对于地层某点的排替压力值,它随深度变化较为明显。而实际地层中的盖层是一个相对稳定的地质体,排替压力的变化相对稳定。因此采用泥质盖层在相对稳定的层序中所占的比重大小,即稳定层序中声波均方根速度值转换的排替压力作为盖层的排替压力值,消除了欠压实带薄互层的影响,同时综合了盖层厚度对封堵能力的影响。
According to a point of layer acoustic velocity value by displacement pressure sesmic interval velocity and acoustic velocity,it changes with depth obviously.In fact the caprock layer is a realativelay stable geological body.The change of displacement pressure is realativelay stable.Stratigraphy of gravity in muddy caplock is used,that is stable acoustic SQRT velocity value displacement pressure as caplock displacement pressure value,which eliminate the effect of effct of uncompaction zone features of Thin Interbed and comprehens the effect of seal of caplock thickness.
According to a point of layer acoustic velocity value by displacement pressure sesmic interval velocity and acoustic velocity,it changes with depth obviously.In fact the caprock layer is a realativelay stable geological body.The change of displacement pressure is realativelay stable.Stratigraphy of gravity in muddy caplock is used,that is stable acoustic SQRT velocity value displacement pressure as caplock displacement pressure value,which eliminate the effect of effct of uncompaction zone features of Thin Interbed and comprehens the effect of seal of caplock thickness.
引文
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