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用主频计算法对长庆气田主力储层中下奥陶统马家沟组马五 1段碳酸盐岩的自然伽玛测井曲线进行了分析 ,得出其主要沉积旋回周期为 1 0 0、57、3 6和 2 6ka,基本与米兰科维奇旋回的地球自转偏心率和地轴倾角变化周期相一致 ,因而 ,可以认为储层的沉积旋回是地球自转偏心率和地轴倾角变化引起气候周期性变化形成的 ,其中又以偏心率影响最大 ,表明主频计算法用于测井曲线进行分辨率较高的沉积旋回分析是可行的
Using the dominant frequency method, the natural gamma ray logging curves of the carbonate rocks in Ma5F1 of Lower Ordovician Majiagou Formation in the main reservoir of Changqing Gas Field are analyzed. The main sedimentary cycles are 10 0, 57, 36, and 26 ka, which are basically consistent with the rotation cycle of the Earth’s rotation and the dip of the Milankovitch. Therefore, it can be considered that the sedimentary cycle of the reservoir is caused by changes in the Earth’s rotation eccentricity and the inclination of the Earth’s axis Cyclical changes formed, of which the eccentricity has the greatest impact, indicating that the frequency calculation method for well logging curves for high resolution sedimentary cycle analysis is feasible