精细地震波速度模型在复杂断块油气藏中的应用——以茨榆坨油田为例
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摘要
在地震地质解释过程中,地震波速度是地震解释资料中重要的参数。茨榆坨油田构造复杂,地震波速度变化大,为了准确提供井位部署的构造依据,有必要对地震波速度进行研究。以茨榆坨油田钻井资料、测井资料和地震资料为基础,分析了其地震波速度变化规律,建立了精细、准确的三维速度模型;解决了该油田构造复杂的问题,得到了Es31的精细构造,为油田开发井部署提供了准确的构造依据;分析了地震波速度变化对复杂断块油气田构造形态、断层展布的影响。研究结果表明,如果地震波速度偏高,则会形成假的背斜构造现象;如果地震波速度相对偏低,则会使原本的背斜形态不明显。在复杂断块油气藏中,精细地震波速度模型构建的准确程度直接影响地震资料的解释。
Seismic wave velocity is an important parameter during the inter- pretation of seismic-geologic data. Because of large variation range on the seismic wave velocity and complex structure in Ciyutuo Oilfield,it's necessary to research the seismic wave velocity so as to offer accurate tectonic basis for geometric arrangement of wells. Through analyzing the changing regularity of the seismic wave velocity of Ciyutuo Oilfield, refined and accurate 3D velocity model are established in the Ciyutuo Oilfield based on geological data, log information and seismic data. Accurate structure data of Es3 1 section in Ciyutuo Oilfield was determined which would provide tectonic proof for the developing well arrangement and solve the problem of its complex structure. At last,the influence of the velocity variation on tectonic form and fault stretch in the complex fault block oil-gas fields was analyzed. If the seismic wave velocity is higher than its true value, the irreal anticline tectonic phenomenon will appear; or the primary anticline shape will not be defined on the contrary. Establishing an elaborate velocity model is the essential work in the complex fault block reservoirs,and it's accuracy degree can influence the seismic data interpretation directly.
Seismic wave velocity is an important parameter during the inter- pretation of seismic-geologic data. Because of large variation range on the seismic wave velocity and complex structure in Ciyutuo Oilfield,it's necessary to research the seismic wave velocity so as to offer accurate tectonic basis for geometric arrangement of wells. Through analyzing the changing regularity of the seismic wave velocity of Ciyutuo Oilfield, refined and accurate 3D velocity model are established in the Ciyutuo Oilfield based on geological data, log information and seismic data. Accurate structure data of Es3 1 section in Ciyutuo Oilfield was determined which would provide tectonic proof for the developing well arrangement and solve the problem of its complex structure. At last,the influence of the velocity variation on tectonic form and fault stretch in the complex fault block oil-gas fields was analyzed. If the seismic wave velocity is higher than its true value, the irreal anticline tectonic phenomenon will appear; or the primary anticline shape will not be defined on the contrary. Establishing an elaborate velocity model is the essential work in the complex fault block reservoirs,and it's accuracy degree can influence the seismic data interpretation directly.
引文
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[5]王月莲,袁士义,宋新民,等.“无侵线法”流体识别技术在低渗低电阻率油藏中的应用[J].石油勘探与开发,2005,32(3):88-89.
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