Prestack seismic inversion plays a vital roles in reservoir prediction and hydrocarbon identification. With the increase of depth, information of large angle of incidence is deficient, and popular fluid factors are not sensitive enough to discriminate fluid. So a more sensitive fluid indicator aiming at small incident angle is needed to be built for deep reservoir. With rock physics characteristics we derived a new three term AVO approximation in terms of pore-fluid bulk modulus , which is more sensitive to hydrocarbon, dry rock matrix term and density . The accuracy of the new approximation is almost equivalent to Zoeppritz equation. And the most important is that, with this reflective approximation, the condition number of the new coefficient matrix is much smaller, which means the stability of estimating fluid factor is effectively enhanced. Consequently the new approximation can meet the requirements of inversion. In addition, tests on synthetic data shows that the pore-fluid bulk modulus can be estimated reliably from the prestack seismic data. We built a flow path of extracting pore-fluid bulk modulus by elastic impedance inversion for deep reservoir with small incident angle. And the method is proved to be accuracy, reliable and feasible after real data test.
Presentation Date: Wednesday, October 19, 2016
Start Time: 11:35:00 AM
Location: 155
Presentation Type: ORAL