Qintong Sag of Subei Basin has high abundance of oil and gas resources and great exploration potential

but the geological target has the complex characteristics of “thin

broken

small

scattered and hidden”. Since 1989

there is a series of seismic technical breakthroughs in this area. From conventional 3D to high-precision 3D for secondary acquisition

the acquisition method of “single point broadband receiving with digital geophone

medium surface element grid and high coverage times” is established

a series of processing technologies have been formed

such as sequential processing

improved SNR processing

improved resolution processing

structural-constrained mesh tomographic velocity modeling and reverse-time prestack depth migration imaging

etc.

as well as the thin-bedded sandstone prediction technology with the waveform indication inversion of SP sensitive curves. Technological progress has promoted the transformation from simple structural reservoir to complex small fault block reservoir

and then to complex structure-lithology subtle reservoir exploration in Qintong Sag. The analysis shows that the high SNR

high resolution and amplitude-preserving processing effect are limited by the large difference of multi-phase data collection

narrow frequency band of original data and low sampling density of wave field. In order to solve the further problems of the complex subtle reservoir seismic exploration

wireless single-point receiving

single-point broadband excitation

small surface element

high coverage density

wide azimuth seismic acquisition

amplitude quantization quality control

broadband omni-directional processing and five-dimensional interpretation should be explored.