GB/T 33648-2017 in English

This standard systematically specifies the technical requirements for the interpretation of two-dimensional and three-dimensional data in oil and gas seismic exploration, including 12 core chapters and 3 normative appendices. The technical framework covers the entire process of basic data collection, structural interpretation, sequence stratigraphic analysis, reservoir prediction, etc., and is applicable to both onshore and offshore oil and gas exploration.

1. Seismic geological layer calibration system

For the first time, the calibration method of synthetic seismic records and VSP data was systematically standardized (4.3), with the following requirements:

• Wavelet spectrum feature matching degree ≥80%
• Calibration error <1/2 phase
• Multi-well calibration consistency check

2. Layer naming and coding system

Establish a four-level layer code system (4.4.2):

Key nodes for quality control

1. Velocity field verification: Need to pass the well data verification, the relative error in the plain area is ≤1.5% (Table 3)
2. Fault combination inspection: 3D data needs to verify the time slice display characteristics (6.1.2.3)
3. Result drawing review: Contour line modification range <1/3 line spacing (5.5.7)

Typical problem solutions

Main improvements compared to the old standard:

• Added 3D visualization interpretation technical requirements (6.1.2.4)
• Refine the sequence stratigraphic interpretation process (Chapter 9)
• Added prestack inversion quality control requirements (11.2.7)

This standard forms a supporting technical system with SY/T 5615 "Petroleum and Natural Gas Geological Mapping Specifications".