塔里木轮南低凸起三叠系低幅度圈闭幅度计算方法

Methods on Amplitude Calculation of Low Amplitude Trap of the Triassic in Lunnan Lower Uplift,Tarim

轮南低凸起、低幅度圈闭极发育,其中90%的圈闭幅度小于10 m,几乎全部超出目前地震的分辨率极限,落实这些低幅度的圈闭是该区滚动评价难点。鉴于该区三叠系构造形态具继承性特征,通过沉积层古厚度逐层恢复法和沉积盆地碎屑岩原始厚度经验恢复法并结合奥陶系潜山古岩溶残丘高度,对该区圈闭幅度进行地质计算。已钻井实钻结果证实,该评价方法切实有效。

In Lunnan lower uplift, low amplitude trap was densely developed, and more than 90% of these traps have amplitude less than 10 meters, and that has out of the ranges in seismic resolution with current technique. Therefore, the challenge of reservoir rolling evaluation in this area is how to locate these low amplitude traps. Considering the inheri- tance of the Triassic structure in this area, the amplitude of these traps was calculated with two methods： sedimentary de- position＇ s palaeo-thickness bed by bed recuperation and sedimentary basin clasolite＇ s originality thickness experiential recuperation, referred to the height of the karstic residual buried-hill in Ordovician. The result was proved by drilled wells and depicted that these two methods were both effective.