Fine depiction and prediction method for offshore deepwater oil and gas field reservoir

The invention discloses an offshore deepwater oil and gas field reservoir fine description and prediction method, which comprises the following steps: (1) in combination with an offshore deepwater oil and gas field target block deposition background, selecting an onshore reservoir similar to the target block deposition background as a reference object, and obtaining onshore reservoir deposition characteristics, types, evolution laws and interlayer characteristic information; (2) obtaining basic data of a target block, and performing sequence stratigraphic research on the target block according to the lithology and the sudden change condition of logging; (3) performing sedimentary microfacies research by combining sedimentary evolution rule results in the steps (1) and (2); and (4) seismic frequency broadening and inversion are carried out, wave impedance data are inverted according to frequency broadening data after seismic frequency broadening, waveform indication inversion is carried out by taking the wave