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普通的DIVA方法一般只选择一种岩性的层速度作为背景速度,因此存在岩性解释的多解性,不适合对复杂岩性组合的岩性体作预测。为此,本文提出用双临界DIVA详细划分地层岩性的方法。该法利用两种临界条件同时进行判别,不但能够确定地层是偏砂相还是偏泥相,而且可以识别超高速和超低速岩性体。文中实例表明,利用此法预测岩性结果更为可靠。
Ordinary DIVA methods generally choose only one lithologic layer velocity as the background velocity, so there is the multi-solution of lithology interpretation, which is not suitable for predicting the lithology of complex lithology combination. To this end, this paper presents a two-critical DIVA method of detailed stratigraphic lithology. The method uses two critical conditions simultaneously to discriminate, not only to determine whether the strata are off-phase or off-mud, but also to identify ultrahigh-velocity and ultra-low-velocity lithologies. The examples show that using this method to predict lithology results is more reliable.