基于三维叠前深度偏移的深层构造成像与应用
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摘要
针对深层火山岩构造时间偏移成像精度较低和构造形态畸变等问题 ,将三维叠前深度偏移处理技术应用于徐家围子、兴城北等地区的地震资料处理工作中 ,完成了技术储备工作。应用结果表明 ,该技术能够在深度域解释、速度分析模型的建立、时 深转换以及深度域成像和模型的验证中提高成像质量 ,能够将地质学家的区域地质概念与地震成像、速度建模相结合 ,彻底查清勘探与开发过程中所遇到的断层阴影、火山岩、礁石、气柱以及横向速度的微变化等 ,比较真实地反映了地下构造形态。作为地震资料精细处理的新方法 ,三维叠前深度偏移处理技术为准确布井提供了科学的依据 ,具有广阔的应用前景
The time migration for deep subsurface basalt reflection had led to a poor precision and distored imaging to the seismic data collected in Xujiaweizi and Xincheng survey. In order to ride of these shortcomings, 3D prestack depth migration(3DPSDM) was implemented as a prepared technique. By the process of geological model verifying, velocity model building, time depth conversing, seismic data imaging, and geological model verifying,3DPSDM had greatly improved the imaging quality compared with time migration method.With 3DPSDM,the geologist's knowledge about the researched area was properly emerged to the seismic imaging and velocity model building. The imaging results of 3DPSDM have shown that this technique can thoroughly clarify fault shadow, basalt structure raft reflection, gas resources, lateral velocity variation, and correctly figure out the subsurface structure during the oil or gas exploration or oil field development. As a well developed technique of seismic data processing,3DPSDM,can provide some new methods for both seismic data processing and its geological interpretation, meanwhile, it can also instruct the geological drilling scientifically.All of these advantages show that 3DPSDM will be used in oil and gas exploration in future.
The time migration for deep subsurface basalt reflection had led to a poor precision and distored imaging to the seismic data collected in Xujiaweizi and Xincheng survey. In order to ride of these shortcomings, 3D prestack depth migration(3DPSDM) was implemented as a prepared technique. By the process of geological model verifying, velocity model building, time depth conversing, seismic data imaging, and geological model verifying,3DPSDM had greatly improved the imaging quality compared with time migration method.With 3DPSDM,the geologist's knowledge about the researched area was properly emerged to the seismic imaging and velocity model building. The imaging results of 3DPSDM have shown that this technique can thoroughly clarify fault shadow, basalt structure raft reflection, gas resources, lateral velocity variation, and correctly figure out the subsurface structure during the oil or gas exploration or oil field development. As a well developed technique of seismic data processing,3DPSDM,can provide some new methods for both seismic data processing and its geological interpretation, meanwhile, it can also instruct the geological drilling scientifically.All of these advantages show that 3DPSDM will be used in oil and gas exploration in future.
引文
[1]马在田地震成像技术[M ]北京:石油工业出版社,1989
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