Gas-bearing Reservoir Prediction of Braided River

doi:10.11885/j.issn.1674-5086.2013.07.18.02

Abstract

Abstract:

The He 8 and Shan 1 members belonging to braided-river deposition are pay zones of Sulige western region，
Ordos basin. The ranges of P-wave impedance of gas-bearing reservoir and surrounding rocks of these two members are
overlapping. The gas reservoir could not be feasibly recognized by conventional post-stack seismic data. Also，due to the
discontinuous mid-weak amplitude of seismic reflection，the seismic event of Shan1 member can′t be picked in the whole work
area，leading to difficulty in obtaining the plane view of its sandstone distribution. Attempting to solve the problems above，
we established the seismic response characterization of braided-river according to its sedimentary model. As the difference
of Poisson ratio of gas-bearing reservoir and surrounding rocks are distinct，the AVO seismic data were utilized to identify
gas-bearing reservoir. The conception of lithological converting has been proposed with reference to the theory of seismicsedimentology.
The AVO attribute volume was converted to lithological volume，which provides convenience for the subsequent
interpretation work. The isochronous surface of Shan1 member seismic reflection can be obtained with the aid of slicing method.
The result shows that the feasibility of lithological converting of AVO attribute volume has been demonstrated by forward
modeling and practical application. This series of method is capable of recognizing gas-bearing reservoir of He 8 and Shan 1
members，and the evolutional history and plane distribution character of the gas-bearing reservoir are clearly delineated by the
slices with isochronous significance.

Key words: braided-river deposition, pre-stack seismic data, AVO attribute volume, lithological converting, seismic sedimentology

Hong Zhong, Liu Huaqing, Zhang Menggang. Gas-bearing Reservoir Prediction of Braided River[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.07.18.02.

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