GB/T 34906-2017 in English
VALIDGeological evaluating methods for tight oil
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 34906-2017致密油地质评价方法》由TC355（全国石油天然气标准化技术委员会）归口，TC355SC3（全国石油天然气标准化技术委员会石油地质勘探分会）执行，主管部门为国家标准化管理委员会。
Introduction
National Standard of the People's Republic of China GB/T 34906—2017
Geological Evaluation Methods for Tight Oil
Introduction and Background
Tight oil exploration is an important area of unconventional oil exploration in the world. my country has huge potential for tight oil resources. In order to meet the needs of unconventional oil and gas development in my country, this standard is specially formulated to regulate and guide the exploration and development of tight oil in my country and provide a basis for policy formulation, scientific research and achievement evaluation.
Overview of the Standard Framework
| Chapter Number | Chapter Content | Key Points |
|---|---|---|
| 1 | Scope | It specifies the content, parameters and methods of geological evaluation of tight oil and is applicable to geological evaluation of tight oil. |
| 2 | Normative References | It references key standards such as SY/T 5336 and SY/T 5735. |
| 3 | Terms and Definitions | It clarifies core terms such as "tight oil", "overburden matrix permeability" and "sweet spot". |
| 4 | Tight oil geological evaluation | Including core sample screening and preparation, permeability measurement and calibration, determination of tight oil layers and other technical details. |
| 5 | Main achievements | The specific requirements for data reports, drawings and tables are clarified. |
Technical key points interpretation
Core sample screening and preparation: According to the provisions of SY/T5336, the sampling density is 5-8 horizontal samples per meter and 2-3 vertical samples per meter.
Permeability measurement and calibration: All core samples need to measure conventional porosity and air permeability. 20%-25% representative samples were selected for overburden matrix permeability test, and the test method was carried out in accordance with the provisions of SY/T6385.
Determination of tight oil layer: The overburden matrix permeability measurement and correction results of all core samples in the evaluation layer were statistically evaluated, and the median overburden matrix permeability should be less than or equal to 0.1×10⁻³μm².
Comparison of standard frameworks
| Evaluation content | Key indicators | Weight |
|---|---|---|
| Lithology | Effective reservoir thickness/m | 0.1 |
| Physical properties | Porosity/% | 0.1 |
| Oil content | Oil saturation/% | 0.025 |
Implementation suggestions
Data acquisition and processing:Core sample screening and preparation should be carried out strictly in accordance with standard requirements to ensure sampling density and representativeness. It is recommended to use automated equipment to assist in the determination of conventional porosity and air permeability.
Parameter correction and analysis:During the permeability determination process, pay attention to controlling the experimental confining pressure conditions to ensure the accuracy of the overburden matrix permeability correction. It is recommended to use the segmented fitting method to deal with situations where the relative error exceeds 10%.
Geological evaluation and decision-making:Based on the characteristics of source rocks, reservoir classification and resource potential evaluation results, the distribution range of tight oil sweet spots is optimized to provide a scientific basis for subsequent exploration and development.
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