多频率域不连续性检测在蚂蚁体追踪断裂中的优选与应用

Optimization and application of discontinuity detection in multi-frequency domain in ant-tracking

蚂蚁体追踪技术在地震解释中展现了对断裂刻画的优越性,但在使用过程中,存在地震资料质量的限制、输入数据的选择、单一属性的多解性等问题,提高蚂蚁体预测精度一直是业界研究的难点与热点。本文以塔里木盆地顺北地区顺1井区为研究对象,分析混沌、方差、最大正曲率属性的本质差异与断裂检测能力;基于广义S变换频谱分解,逐一比较3种属性在不同频率下的不连续性检测效果,并进行蚂蚁追踪与优选;结合产状控制进行RGB融合,形成了一套多频率域、多属性的蚂蚁体追踪解释断裂方法。研究表明,低频混沌属性适用于大断层的解释,中频方差属性可识别中等尺度断裂,高频曲率属性对小尺度断裂反映较好;结合分频与不连续性检测技术的蚂蚁体能多尺度显示工区断裂展布特征与细节,充实地下地质信息。

The application of ant-tracking in seismic interpretation shows its advantages in fault characterization.However,this technology is limited by the quality of seismic data,the selection of ant-tracking input data,and multi-solution caused by single attribute.Thus,how to improve the accuracy of anttracking has been the hot issue and hard nut to crack in the industry.This paper takes well-block 1 in Shunbei area of Tarim Basin as the research object,and analyses the differences and application potential of chaos,variance,and the maximum positive curvature theories in fault detection.Besides,based on generalized S transform spectral decomposition,we compare discontinuity detection effects of chaos,variance and the maximum positive curvature attributes in different frequencies.Next,the data is processed after discontinuity detection with ant-tracking and optimize the best date for each frequency.Finally,RGB fusion is carried out after occurrence control.Results show that chaos in low frequency,variance in medium frequency and the maximum positive curvature in high frequency respond well with big,medium and small faults.The ant-tracking aided with multi-frequency domain and different fault detections can display multi-scale fracture distribution and enrich the underground geological information.