Velocity field datum conversion based on statics model
Yu Yueyu1,2, Cao Daiyong1, Peng Hongzhao2, Xing Chunying2
1. China University of Mining & Technology(Beijing), Beijing 100083, China;
2. National Engineering Research Center of Coalbed Methane, Beijing 100095, China
Abstract：We transform a CMP floating datum to a common datum based on concepts of datum statics and definitions on CMP floating datum, and find out that the top of the high velocity layer or an intermediate reference surface from near surface model for datum statics has its exact definitions in both the time domain and the depth domain. We propose a method for velocity field datum conversion based on statics model. First we strip the layer from CMP datum to the top of the high velocity layer or to the intermediate reference surface. Then we fill in with constant-velocity media. So CMP floating datum can be effectively transformed to the common datum, and it is helpful to create a velocity field for time-depth conversion under the common datum. In addition, the proposed method strictly follows the physical meaning and concepts of datum statics. Applications of this method in eastern Ordos Basin show desirable accuracy of time-depth conversion.
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