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- Title
致密砂岩气藏气水层识别新方法 --以苏76 井区为例.
- Authors
朱文卿; 高树生; 沈杰; 叶礼友; 刘华勋
- Abstract
The Su76 well area is located in the western part of the Ordos Basin,and its physical properties are obviously worse than those in the east-central parts. It is a dense sandstone gas reservoir with high water saturation and extremely low porosity. Gas wells generally have the characteristics of high water production ratio,low production capacity and low recovery rate. In order to accurately identify the gas and water layer to reduce the risk of water production,movable water saturation are introduced into the normal gas and water layer identification method,and a comprehensive identification method for gas and water layer is established by analyzing a large number of log interpretation results,production data and gas test results. The results show that the pore structure of the reservoir in Su76 block is poor and the micro pore is developed,resulting in high irreducible water saturation and poor gas bearing. In the process of development,partial bound water is converted into movable water,and movable water saturation can characterize the flow capacity of water phase. Nuclear magnetic resonance results show that the movable water saturation of the block is low;by contrast and analysis between the conventional logging interpretations and practical performance data of the movable water saturation,comprehensive identification method of gas and water layer is established. Through the identification results,the gas production prediction of single well can be carried out,and the perforation layer can be optimized to reduce the water production risk of gas well;Based on the achievements,the gas & water distribution map is drawn foe the study area,therefore the low-risk block of the water production is optimized,the main reservoirs of the gasfield are ensured. The research results have provided a theoretical evidence for the reasonable development of the sandstone gasfield in China.
- Subjects
CHINA; GAS wells; WATER-gas; NUCLEAR magnetic resonance; GAS distribution; GAS fields; GAS-lubricated bearings; HYDRAULICS
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 11, p1629
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.05.002