Application of Seismic Waveform Indication Simulation Inversion in Reservoir Prediction of Fuyu Oil-Bearing Formation in Block B of Songliao Basin

Abstract

The Fuyu oil formation in block B is a structural-lithologic reservoir with subaqueous branch channel and mouth bar microfacies as the main reservoir facies, followed by the inter-channel and floodplain microfacies, thin and discontinuous sand bodies, and unclear plane distribution which makes the exploration of this block to be difficult. Based on fundamental geological research, the comprehensive application of geophysical techniques such as seismic attributes and reservoir inversion are used to carry out reservoir prediction in this study area and describe the horizontal distribution of sand bodies. The research shows that the average correlation rate between the optimal sand body sensitive attribute prediction results and the well is 50%, which is far from the acceptable exploration requirements of this area; seismic waveforms indicate that simulation inversion can identify sand bodies thicker than 3 m, the conformity of sand bodies with a thickness of more than 10 m is more than 85%, the conformity of sand bodies with a thickness of 3–10 m is about 80%, whereas that of sand bodies with thickness below 3 m is greater than 70%, which meets the requirements of a good exploration. The sand bodies of Fu 1 oil layer are distributed in strips, and the strikes are located in northwest and northeast. The sand bodies of the Fu 2 oil layer are mainly distributed in the northeastern part of the block, and are distributed in a NW trending belt. The research results provide scientific guidance for the next step of exploration in the block, and the research method also provides a reference for other areas with similar geological conditions.

Copyright 2022, IFEDC Organizing Committee

This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16–18 November 2022.

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