Abundant sand-gravel body is developed in the north of the steep-slope zone of Dongying Sag,which displays strong
top reflection and disordered internal reflection on the seismic sections.Because of the hydrocarbon sealing ability
in the root of sand-gravel fans,most of these in deep layers are rich in oil and gas.However,the physical properties
and oil-bearing potential varies largely in the sand-gravel body,therefore,it is important to carry out physical
properties prediction and hydrocarbon detection in the area.Pre-stack simultaneous inversion utilizes prestack
incident-angle stack data as well as P-wave,S-wave and density logging data,and can simultaneously invert many
rock physical parameters associated with lithology and physical properties to comprehensively evaluate the
reservoirs.In the prediction of the physical properties and oil-gas potential of sand-gravel body with the first class of
AVO response in the deep layers of northern Dongying Sag,we use prestack simultaneous inversion technique to
accurately predict the depth and plane distribution of effective reservoirs.The technique provides us a reliable basis
for the development of sand-gravel body reservoirs.
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