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| A study of the method of well controlled high precision variable velocity mapping in the subsalt complex structure area of Gabon |
| ZHANG Jun |
| Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China |
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Abstract With the deepening of oil and gas field development,seismic data interpretation and structural mapping accuracy requirements are also increasing.Especially in complex surface,underground complex and steep dip formation regions,high-precision velocity field must be established with variable velocity mapping to obtain a fine structure diagram and fine implementation of construction.However,in the complex structure area,it is difficult to get an accurate structural model with the conventional velocity models,because speed change is very big also in the vertical and horizontal direction.Based on the study of currently used velocity modeling techniques for complex area,the authors put forward the technical method about seismic and logging constrained 3D velocity model that takes full advantage of unified corrected wells velocity,seismic velocity spectrum and other information and,combined with layers control action,finally uses the time depth conversion to realize the structural mapping.Research on the technology for the construction of onshore Gabon Zone salt has achieved good results.
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Received: 18 November 2016
Published: 20 June 2017
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