1. 中国石油华北油田公司地球物理勘探研究院, 河北任丘 062552;
2. Institute of Pet Engineering, Heriot-Watt University, Edinburgh, EH144AS, UK
High-precision residual interval velocity field construction with stable mudstone interval velocity
Xiao Yang1, Wang Pan1, Wei Yan1, Guo Ruibo2, Pan Juan1, Chen Yuting1
1. Geophysical Exploration Research Institute, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China;
2. Institute of Pet Engineering, Heriot-Watt University, Edinburgh, EH144 AS, United Kingdom
Abstract：High-precision residual interval velocity field construction needs to solve two problems:building both a high-precision interval velocity field and a high precision normal compaction velocity field.So we propose in this paper a new method to exactly calculate the residual interval velocity field.First we calculate interval velocity based on the model tomographic method.Then we obtain an accurate interval velocity field by the calibration between well velocity and seismic velocity,and 3D space grids.After that we calculate normal compaction velocity field based on fitting stable pure mudstone interval velocity from drilling data.Finally,with the compaction correction on interval velocity field,we get the exact residual interval velocity field which allows us to predict the lithology.Our research results show that normal compaction velocity values we get by fitting stable pure mudstone section are very close to real situation after the high precision of interval velocity field is established based on model tomographic method.Consequently,we can pick out more and smaller sand body from interval velocity field,and improve reservoir prediction.The proposed method is effectively applied in SH Depression,Erlian Basin,and we have successfully predicted the reservoir distribution,and propose well deployment for the future drilling.
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