Methods and systems for accurate well-seismic tie based on stepwise matching and optimization

A system for an accurate well-seismic tie based on stepwise matching and optimization, comprising:

• based on seismic data and logging information, a first determination module configured to determine target seismic data as a seismic trace near well and perform first data processing on the target seismic data;
• a second determination module configured to perform, based on a target calibration object, second data processing on the logging information to determine a reflection coefficient sequence;
• a third determination module configured to extract seismic wavelets of the seismic trace near well, convoluting the seismic wavelets with the reflection coefficient sequence, determine a synthetic seismic record of the target calibration object in a time domain, and perform third data processing on the synthetic seismic record;
• a preliminary alignment module configured to determine, through a first preset algorithm, a correlation between the seismic trace near well and the synthetic seismic record, determine a global time shift between the synthetic seismic record and the seismic trace near well, and perform a preliminary alignment on the synthetic seismic record through the global time shift;
• and
• an accurate calibration module configured to calculate a local time shift between the seismic trace near well and the synthetic seismic record through a second preset algorithm and accurately calibrate the synthetic seismic record through the local time shift.