The application of low-amplitude structure based on low-frequency reduction
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摘要: 随着勘探程度的不断提高,低幅度构造油气藏日益受到重视。目前识别低幅度构造的方法不能有效消除地震资料中包含的构造低频背景信息,无法精确识别低幅度构造。本文以去低频化为基础,利用趋势分解法,通过搜索构造起伏拐点,实现对低幅度构造成图,再结合小波分解在大尺度时频域具有良好的连续性,将构造数据进行小波变换和逆变换,最终得到消除构造低频背景的低幅构造解释图。E盆地北部的实际应用显示,基于去低频化的低幅度构造识别方法,增强了局部微构造特征,同时也弥补了构造高程差及随机因子对低幅度构造的影响,达到低幅度构造成图完整精细的目的,对后续构造幅度低的复杂油气藏的勘探开发具有重大的指导意义。Abstract: With the continuous improvement of exploration degree,more and more attention has been paid to low-range structural oil and gas reservoirs.Current methods for identifying low-amplitude structures cannot effectively eliminate low-frequency structural background information contained in seismic data,and cannot accurately identify low-amplitude structures.In this paper,on the basis of de-frequency reduction,the trend decomposition method was used in the search for structural inflection points,and the low-amplitude structure was graphed. Combined with the wavelet decomposition method,the continuity in the large-scale time-frequency domain is good.The inverse transform finally obtains a low-amplitude structure explanatory diagram that eliminates the low-frequency background of the structure.The practical application in the northern part of E Basin shows that the low-amplitude structure identification method based on de-frequency reduction enhances the local micro-structural characteristics,and also makes up for the influence of structural elevation difference and random factors on low-amplitude structures.The purpose of the complete and detailed map is of great guiding significance for the exploration and development of complex oil and gas reservoirs with low structural amplitude.
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