Abstract

Bottom Simulating Reflector (BSR) is the only indirect evidence of gas hydrate accumulation seen in seismic data along with associated features like amplitude blanking etc. On CDP gathers, BSR horizon evinces a classic class III AVO effect where absolute amplitude increases with offset. Although the class III AVO in the case of BSR is not always indicative of gas, however this characteristic of BSR as well as many horizons with underlying gas pool has been a hot (bright?) spot of research in seismic industry. In the case of class III AVO, the angle dependent reflectivity increases the amplitude with offset. But due to angle dependent directivity factor, the loss of amplitude with offset smudges the true increase of amplitude with offset. The so called