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惠州凹陷目的层成岩作用复杂,东沙隆起碳酸盐岩发育造成附近碎屑岩储层与围岩受灰质影响严重,即砂、泥岩都有被钙质胶结情况,钙质介入使砂泥岩速度差异变小,导致常规波阻抗反演无法有效区分储层与围岩,研究表明砂泥岩阻抗范围相近且相互重叠,给储层预测带来困难。通过对本区测井资料岩石物理分析可以看出伽马曲线区分砂泥岩效果较好,因此利用伽马曲线对声波曲线进行重构,并进行伪波阻抗反演研究,结果证明重构声波曲线所得波阻抗剖面区分砂泥岩程度较高,符合储层预测需要,满足应用目的。
The diagenesis of the target layer in Huizhou Depression is complicated. The development of carbonate rocks in the east Shalian uplift caused serious impact of gray matter on the nearby clastic rock reservoirs and surrounding rocks, ie, the calcareous cementation of sand and mudstone, and the difference in velocity of sandstone and mudstone As a result, the conventional wave impedance inversion can not effectively distinguish the reservoir from the surrounding rock. Studies have shown that the impedance range of the sandstone and mudstone are similar and overlap each other, which makes it difficult to predict the reservoir. Through the petrophysical analysis of logging data in this area, it can be seen that the Gamma curve distinguishes sandstone from mudstone well. Therefore, using gamma curve to reconstruct the acoustic wave curve and performing pseudo-impedance inversion, the results show that reconstructing the acoustic curve The wave impedance profile distinguishes sandstone and mudstone to a high degree, which accords with the prediction of reservoir and meets the purpose of application.