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The Application of Rock Physics and Pre-Stack Previous HitAVONext Hit Previous HitAnalysisNext Hit for Gas Identification in Deepwater Sediments, Rakhine Bain, offshore Myanmar

Zuo, Guoping

As geophysical exploration technologies, Rock Physics and Pre-stack Previous HitAVONext Hit Previous HitanalysisNext Hit are widely used in oil and gas exploration, it enjoys an irreplaceable position since it was first used in Previous HitamplitudeNext Hit detection, such as bright point, flat point, etc.

Rock Physics Previous HitanalysisNext Hit has been carried out in this research based on wells in order to prove the probability of Previous HitAVONext Hit method. According to forward modeling and fluid substitution, the curve characteristics corresponding to Previous HitamplitudeNext Hit are defined, and relevant Previous HitAVONext Hit attributes are calculated, which serve as the basis for following seismic Previous HitAVONext Hit attribute Previous HitanalysisNext Hit. The findings of this research include that when reservoir contains gas, the result of forward modeling indicates that Previous HitamplitudeNext Hit increases with Previous HitoffsetNext Hit, it belongs to class 3 Previous HitAVONext Hit response, in addition, through rock physics Previous HitanalysisNext Hit, P-wave velocity, P-wave impedance, Fluid factor, intercept × gradient (P×G) and Poisson ratio all change fast, on the other side, using fluid substitution, the gas was replaced by brine, then, the result of forward modeling indicates that Previous HitamplitudeNext Hit changes little with Previous HitoffsetNext Hit, the rock physics attributes only show tiny changes. So, these sensitive attributes for gas reservoir can be used to detect gas reservoir.

Through Previous HitAVONext Hit Previous HitanalysisNext Hit, based on Aki & Richards equation and Shuey equation, a set of attributes are obtained from seismic data. According to rock physics Previous HitanalysisNext Hit, the attributes sensitive to hydrocarbon are used to detect gas reservoir.

Combining those attributes with cross plot method, Previous HitAVONext Hit method is much more effective to detect gas reservoir. Class 3 Previous HitAVONext Hit abnormity can be distinguished easily in the cross plot of P and G. In addition, in the cross plot of far angle stack and near angle stack, it is easier to feature gas reservoir which has the characteristic of that Previous HitamplitudeNext Hit of far angle stack is stronger than near angle stack.

In this research, P×G, fluid factor, Poisson ratio and P-wave impedance, near angel stack and far angle stack data are selected to analyze due to their sensitivity to gas layers. Through rock physics and Previous HitAVONext Hit Previous HitanalysisNext Hit, many objectives have been discovered in the study area. The application of rock physics and Previous HitAVONext Hit Previous HitanalysisTop has achieved remarkable effect in gas layer identification.

 

AAPG Search and Discovery Article #90163©2013AAPG 2013 Annual Convention and Exhibition, Pittsburgh, Pennsylvania, May 19-22, 2013