GB/T 33684-2017 in English
SUPERSEDEDTechnical specification of seismic data interpretation
- Issued on:2017-05-12
- Implemented on:2017-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
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《GB/T 33684-2017地震勘探资料解释技术规程》由TC355（全国石油天然气标准化技术委员会）归口，TC355SC2（全国石油天然气标准化技术委员会地球物理勘探分会）执行，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
| Technical modules | Requirements for 2D interpretation | Differences in 3D interpretation | Quality control indicators |
|---|---|---|---|
| Structural interpretation | Network interpretation of backbone profiles, fault classification (Grade I-III) | Volume interpretation + time slice verification, fault identification accuracy 0.5 phase | Plane position error ≤1mm, depth relative error ≤3% |
| Horizontal calibration | Synthetic record/VSP calibration, phase consistency required ≥60% | Calibration error ≤1/2 phase | |
| Velocity analysis | Integrate sonic logging, VSP and velocity spectrum to establish space-varying velocity field | Allowable error ≤5% in mountainous areas | |
Key technical innovations
Seismic geological layer code system: Adopt the T_{ab}^{cd} coding rule, where:
- a=system/system code (such as J2 for Middle Jurassic)
- b=first letter of the group name (such as s for Shahejie Formation)
- c=segment sequence/azimuth (1 for lower segment)
- d=oil and gas layer number
Example:>T_{E3s}^{1-2} represents the top surface of the 2nd oil group of the first section of the Shahejie Formation in the Oligocene
Key points for implementation
- Data preparation stage: It is necessary to collect 12 types of basic data such as survey line location map, velocity spectrum, drilling stratification, etc. (Standard 4.1 clause)
- 3D interpretation process:
- Establishment of backbone profile network→Stratum body tracking→Fault space combination
- Time slice verification requires that the longitudinal profile usage rate is ＞25%
- Result verification: Use the drilling conformity inspection formula:
η=(a₀+b₀+c₀)/(a+b+c)×100% ≥70% is qualified
Solutions to common problems
| Problem type | Standard clause | Handling suggestion |
|---|---|---|
| Fault plane combination contradiction | 5.3.3/6.1.2 | Check the section inclination change rate ≤15°/km |
| Large time-to-depth conversion error | 8.3.1 | Add VSP velocity control points, and the density should be increased to 2km/point in mountainous areas |
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