The low SNR of seismic data is one of the main factors
that work on the reliability of seismic interpretation. The
complicated fault block area with low SNR in Tabei region of
the Subei Basin is a good example to study and sum up the
interpreting methods in the complicated fault block area.
The feature of Tabei region of the Subei Basin includes
underground rock disintegration , complicated fault block ,
the general low SNR. There comes forth four obvious
problems when carrying out seismic interpretation : 1. the
discontinuity and the weak energy of seismic reflection ; 2.
the bad comparability of the T13reflectance signature and
transverse variety of T33
reflectance signature ;3. the unclarity
of fault surface and breakpoint ; 4. the disturbance of multi2
attitude. Aiming at the above problems , applying the
corresponding countermeasures such as velocity analysis , full
3-D interpretation and depth correction , the two basic
questions of the identification of stratigraphic horizons and
the detection of faults were basically solved. Both questions
are the main tough problems during the seismic data
interpretation. After the seismic interpretation of low SNR
complicated fault block area in Tabei region of the Subei
Basin , the Ta-8 reverse nose structure was identified and
well location demonstration was passed. And the real drilling
illustrates the favorable evidences of oil and gas in the E1 f2
layer of well Ta-8.
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