Full text loading...
-
Potential of Oil Seismic Data Reprocessing for Near-surface Characterization Using Refraction and Reflection Methods
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
This work shows the potential of reprocessing land seismic vintage data acquired for oil exploration to increase knowledge of near-surface geological structure in a Neogene Basin. The study area is the Empordà Basin, located in NE Spain. The objective is to reveal main contacts in the Neogene sequence and bedrock geometry. The methodology encompasses refraction and reflection techniques. A reflection reprocessing flow has been created to enhance shallow reflections. Refraction velocity information helps constrain the selection of semblance maxima during the velocity analysis and also to refine statics correction. After reprocessing, seismic sections reveal near-surface reflections not imaged with the original processing. Finally, integration of both velocity models from refraction technique and seismic reflection sections reduce uncertainties on the interpretation stage. In spite of the acquisition parameters focused on deeper targets, this methodology allows improving characterization of near-surface structures.