针对制约岩石物理反演精度的两个关键问题:岩石物理模型和反演算法,提出了一种线性化岩石物理反演方法。首先,对复杂岩石物理模型进行泰勒展开,得到岩石物理反演问题的一阶近似表达式;然后,利用阻尼最小二乘算法直接求解线性化的岩石物理反演问题,获得岩石物理反演问题的解析解。该方法不需要全局寻优或者随机抽样,而是直接求逆运算,计算效率高。理论模型分析表明,线性化岩石物理模型可以用来近似表示复杂岩石物理模型。实际测井数据和地震数据应用表明,线性化岩石物理反演方法可以获得较为准确的物性参数。该方法适用于线性或轻微非线性的岩石物理模型,对于高度非线性岩石物理模型可能不适应。图8参31
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