基于岩石物理建模的碳酸盐岩泥质校正反演方法——以轮古地区为例
摘要
塔北轮古东地区奥陶系内幕区发育丰富的缝洞型碳酸盐岩储层,含油气层系为良里塔格组、一间房组,其中良里塔格组顶部发育泥质灰岩条带且在全区均有分布。地震上,缝洞储层与泥质灰岩条带的地震响应难以区分;常规阻抗反演剖面上,泥质灰岩条带与缝洞储层均表现为低阻抗特征,也无法区分,影响储层识别准确性。针对塔北轮古东地区奥陶系良里塔格组储层预测难点,论文基于等效矿物模型,在岩石物理建模的基础上类比流体替代的思路对工区内钻井的孔隙度曲线进行置换作为岩相背景曲线,从原有的相控反演结果中减去岩相背景曲线插值成的阻抗体并与均质灰岩构成的阻抗体叠加,得到仅含储层响应的阻抗体,将该阻抗体作为低频模型进行叠后确定性反演,从而达成泥质校正的目的,提高碳酸盐岩储层的量化预测精度。
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DOI: http://dx.doi.org/10.12345/smg.v4i1.10104
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