摘要
塔里木盆地顺北探区广泛发育有二叠系火成岩,火成岩引起的速度变化严重制约着下伏地层成像,火成岩速度准确与否对提升下伏地层成像有着重要意义。为此,对二叠系火成岩测井岩石物理与地震响应特征进行分析,发现速度场能够很好的反映火成岩沉积变化趋势,采用基于速度场约束建模方法构建模型,得到高精度初始速度模型,结合叠后反演明确火成岩速度体空间展布特征,将火成岩速度体应用于深度偏移速度建模,较好解决因测井资料局限而无法开展火成岩速度体精准描述的问题,提高深度偏移速度模型的精确度,深度偏移成像构造准确。
Permian igneous rocks are widely developed in Shunbei exploration area of Tarim Basin.The velocity change caused by igneous rocks seriously restricts the imaging of underlying strata.The accuracy of igneous rock velocity is of great significance for improving the imaging of underlying strata.To this end,an analysis was conducted on the physical and seismic response characteristics of the Permian igneous rock logging data,and it was found that the velocity field can well reflect the sedimentary trend of the igneous rock.A high-precision initial velocity model was constructed based on the velocity field constraint modeling method,and the spatial distribution characteristics of the igneous rock velocity volume were clarified through post stack inversion.The igneous rock velocity volume was applied to deep migration velocity modeling,Better solution to the problem of inability to accurately describe igneous rock velocity bodies due to limited logging data,improving the accuracy of depth migration velocity models,and accurately constructing depth migration imaging structures.
作者
夏勇
Xia Yong(Sinopec Geophysical Research Institute Co.,Ltd.,Nanjing 211103)
出处
《石化技术》
CAS
2024年第4期45-47,共3页
Petrochemical Industry Technology
关键词
塔里木盆地
火成岩
速度场
叠后反演
速度建模
Tarim Basin
Igneous rock
Speed field
Post stack inversion
Velocity modeling
