海洋地质前沿2026，Vol.42Issue(5)：65-72,8.DOI:10.16028/j.1009-2722.2026.018
Q叠前深度偏移技术在南海深水凹陷底辟模糊区的应用研究
Application of Q prestack depth migration technology in diapiric blurred zones of deep-water sags in the South China Sea
摘要
Abstract
As typical geological structural units in the deep-water area of the northern South China Sea,deep-wa-ter sags generally exhibit complex geological structures and well-developed diapiric systems.Conventional seis-mic imaging methods,limited by inaccuracies in velocity models and the lack of attenuation correction,often fail to accurately reveal the geological interface morphology and structural details in these regions.To address the coupling challenge of strong absorption-attenuation and complex structures in the Baiyun Sag,a deep-water sag in the northern South China Sea,a Q prestack depth migration(Q-PSDM)technique was introduced based on a Q-compensation mechanism.The target area features dual attenuation characteristics:shallow gas-bearing sediments(Q＜50)cause high-frequency energy attenuation,while deep diapiric fracture zones(Q＜80)lead to enhanced scattering loss.To overcome the imaging blurring caused by the lack of attenuation correction and insufficient ac-curacy of velocity models in conventional methods,a three-in-one technical framework integrating"center-fre-quency-shifted Q tomography inversion,velocity-Q coupled constraint,and GPU parallel computing"was estab-lished.The results demonstrate that Q-PSDM can effectively improve imaging quality in blurred diapiric zones,significantly enhance imaging accuracy and spatial resolution in complex structural areas,and exhibits outstand-ing application performance especially in the diapiric blurred zones of deep-water sags,offering substantial prac-tical value for oil and gas exploration in complex structural areas.关键词
Q叠前深度偏移/深水凹陷/底辟模糊区/地震成像/油气勘探Key words
Q prestack depth migration/deep-water sag/diapiric blurred zone/seismic imaging/oil and gas ex-ploration分类
海洋科学引用本文复制引用
刘洋波,王小杰,刘鸿,孙博,刘金朋,覃殿明,琚昊文,杜皓..Q叠前深度偏移技术在南海深水凹陷底辟模糊区的应用研究[J].海洋地质前沿,2026,42(5):65-72,8.基金项目
国家自然科学基金"南海北部大陆边缘高磁异常带的构造形态及其对中生代古俯冲体系的指示"(42006068) （42006068）
山东省自然科学基金"跨频段融合天然气水合物储层检测研究"(ZR2021MD118) （ZR2021MD118）
