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Detecting Fractures With 3D3C Seismic To Reduce Risk And Optimize Production
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 11th International Congress of the Brazilian Geophysical Society, Aug 2009, cp-195-00137
Abstract
The Xinchang field in western Sichuan Basin, China<br>produces gas from fractures in tight sandstone<br>reservoirs. An integrated field study was performed<br>using full wave (full-azimuth multi-component)<br>seismic data. The porosities in these reservoirs (2-<br>4%) had little influence on production. The key to<br>locating the best well locations included lithology<br>discrimination and identification of the fractured<br>areas.<br>The impedances of the sands and shales are very<br>similar and can not be discriminated by the P wave<br>data. However, the PS data in this full wave data has<br>been very effective in identifying lithology. Shear<br>wave splitting analysis has also indicated orientation<br>and density of fracturing consistent with regional<br>stress data, well results, core analysis, FMI and<br>outcrop work. The integration of the results from the<br>geologic, seismic and reservoir engineering data has<br>led to selection of 16 new well locations and some<br>early drilling success.