【摘要】 西部探区地表、地质条件复杂,导致地震资料品质差,深层成像差,仅靠地震识别深部地层结构属性难度大,可靠性低,多解性强。本文采用基于三维地震剥层的重力界面反演方法,其核心是添加钻井—地质资料约束,在地震构造界面的约束下采用正演"剥皮"技术进行重力场源分离,然后对目标重力异常开展界面反演。正反演阶段采用流行的频率域Parker-Oldenburg迭代算法,保证了反演的快速稳定收敛。结果表明:基于三维地震剥层的重力界面反演方法可以有效剥离浅部高频信号,实现深层目标重力异常的精确分离,进而实现对深层界面的准确标定。在准噶尔盆地东部地区开展深层构造界面反演,结果证实该方法是研究深层地质目标的有效技术手段。更多还原

【Abstract】 The quality of seismic data is poor and imaging is difficult in case of deep layers because of complex near-surface and underground geological structural conditions in western exploration area,and the structure attributes of deep strata are difficult to be identified only by seismic data due to the inherent non-unique problem and the low resolution problem. The gravity interface inversion method based on 3D seismic stripping was adopted in this study,with the addition of drilling-geological data constraints,which can carry out gravity field source separation by means of forward " stripping" under the seismic structural interface constraints,and then the method could carry out interface inversion for target gravity anomaly.The popular frequency domain Parker-Oldenburg iterative algorithm was adopted in the forward inversion stage,which guaranteed the fast and stable convergence of the inversion.The results show that the three-dimensional seismic peeling method can effectively peel off the high-frequency signals,achieve the accurate acquisition of the gravity anomaly caused by the geological target body and calibrate the deep interface accurately.Deep structural interface inversion was carried out in eastern Junggar basin,which proved the method is an effective method for studying deep geological targets.更多还原