SY/T 7463-2019 in English
VALIDShale oil reserves calculation specification
- Issued on:2019-12-30
- Implemented on:2019-12-30
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
Introduction
Standard Background and Significance
As my country's first shale oil reserve calculation industry standard, the release of SY/T 7463-2019 fills the gap in the unconventional oil and gas resource assessment system. The standard innovatively proposes the concepts of sweet spot segment and sweet spot area, and establishes a parameter system based on the "seven property relationships".
Core content analysis
1. Reserve classification system
| Reserve level | Exploration degree | Well control requirements | Data completeness |
|---|---|---|---|
| Proved reserves | Complete development pilot test | Well spacing ≤1.5 times development well spacing | All parameters meet the standards |
| Prohibited reserves | Basically identified sweet spot distribution | Well spacing ≤2.5 times development well spacing | Key parameters meet the standards |
| Predicted reserves | Preliminary determination of sweet spot distribution | Mainly based on seismic prediction | Limited parameters |
2. Key technical parameters
Lower limit of effective thickness: 0.4m (interlayer buckle thickness 0.2m)
Porosity error: Relative error between logging interpretation and core analysis ≤±8%
Oil saturation error: Relative error between calculated value and measured value ≤±5%
Comparison of reserve calculation methods
Standard formula of volumetric method
Geological reserves (N) = 100 × oil-bearing area (A) × effective thickness (h) × effective porosity (φ) × original oil saturation (So) / crude oil volume coefficient (Bo)
Applicable conditions of dynamic method
- Requires ≥ 12 months of stable production data
- Decline rate analysis needs to distinguish between natural decline and measured decline
- EUR prediction needs to consider well interference
Implementation suggestions
- Sweet spot division should be combined with 3D seismic and microseismic monitoring data
- Horizontal section length design needs to match technically recoverable reserves calculation unit
- Economic evaluation should distinguish between EUR1 (technically recoverable) and EUR2 (economically recoverable)
Technology evolution direction
With the application of nano-CT and digital core technologies, future standards will be improved:
1. Shale oil movable fluid saturation determination method
2. Multi-scale pore network model parameter standard
3. Reserve probability assessment based on machine learning
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