GB/T 41611-2022 in English
VALIDTerms and definitions of shale gas
- Issued on:2022-07-11
- Implemented on:2022-11-01
- File Format:PDF
- Delivery:Within 1 day
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| Standard No: | GB/T 41611-2022 |
| Document status: | VALID |
| Title in English: | Terms and definitions of shale gas |
| Title in Chinese: | 页岩气术语和定义 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Within 1 day |
| Issued on: | 2022-07-11 |
| Implemented on: | 2022-11-01 |
| Chinese Classification: | E24-Natural gas |
| Professional Classification: | GB-National Standard |
| Related Keywords: | shale gas
organic-rich shale intervals gas reservoir shale gas introduction core content structure shale gas definition article gas content evaluation drilling |
| Related Topics: | shale
rock Shale gas by province Shale gas tracer shale gas Shale gas by province Shale gas products Shale permeability gas shale section GBT41611 GB/T 41611-2022 Shale gas fracturing industry Shale gas industry regulation Shale gas testing industry |
《GB/T 41611-2022页岩气术语和定义》由TC244（全国天然气标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Core content structure of the standard
| Chapters | Number of terms | Key technical points |
|---|---|---|
| General foundation | 14 | Clearly define shale gas and determine the criteria for organic-rich shale intervals |
| Gas reservoir geology | 56 | Covering core indicators such as sedimentary environment, reservoir pore classification, and gas content evaluation |
| Drilling engineering | 27 | Includes key technical requirements such as horizontal well trajectory control and oil-based drilling fluid |
| Fracturing process | 32 | Define innovative technical specifications such as volume fracturing and factory-based operations |
Analysis of key technical terms
1. Evolution of shale gas definition
Article 3.1 of the standard clearly defines shale gas as unconventional natural gas that is mainly in the free state (40-75%) and adsorbed state (20-60%). Compared with the 2015 version of GB/T31483, a new description of the dissolved state occurrence form has been added, reflecting the deepening of the understanding of the occurrence mechanism.
2. Key indicators for reservoir evaluation
Nanopore classification system:
- Micropores (＜2nm) account for more than 60%
- Mesopores (2-50nm) dominate gas diffusion
- Macropores (＞50nm) affect fracturing fluid loss
In actual applications, the micropore specific surface area of the shale reservoir in the Changning block in Sichuan is 25-35m²/g, which is the main storage space for adsorbed gas.
Comparative Analysis of Engineering Practices
| Fracturing Methods | Applicable Conditions | Construction Efficiency | Typical Cases |
|---|---|---|---|
| Synchronous Fracturing | Well Spacing <300m | Efficiency Increased by 40% | Fuling Jiaoshiba Platform |
| Zipper Fracturing | Number of Wells on the Platform ≥4 | Cost Reduced by 25% | Weiyuan Shale Gas Field |
| Repeated Fracturing | Old Wells in Production for More Than 3 Years | Increase Production by 2-3 Times | Zhaotong Demonstration Area |
Recommendations for the implementation of the standard
- Exploration stage: Prioritize the prospect evaluation method in Article 4.8.5, and select the target area by combining the dual parameters of TOC>2% and brittle minerals>40%.
- Development and design: Deploy according to the well factory model in Article 5.5.1, and recommend 6-8 platform wells and a well spacing of 400-600m.
- Environmental compliance: Implement the requirements for resource utilization of oil-bearing drill cuttings in Article 9.10, and the oil content after thermal analysis must be <0.3%.
Sample only — not a preview of GB/T 41611-2022
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