Laws of Coalbed Methane Enrichment and High Productivity in the Fanzhuang Block of the Qinshui Basin and Development Practices
详细信息
- 责任者：Liu Yanhong (Coalbed Methane Gas Exploration and Development Branch ; Huabei Oilfield Company ; PetroChina ; Jincheng 048000 ; China) ; Li Mengxi
- 刊名：Natural Gas Industry
- 出版年：2012
- 卷期：32(4)
- 关键词：煤层气 ; coalbed gas ; 沁水盆地 ; Qinshui Basin
- 页码：p.29-32
- 图表：1 illus., 3 tables, 14 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
To make it clear the laws of coalbed methane enrichment and high productivity in the Fanzhuang Block of the Qinshui Basin, we learn from the development practices in this area over the past 5 years, on this basis, we make a systematic analysis of coalbed methane gas pooling conditions and patterns in the three aspects of source rocks, reservoir beds and preservation conditions. In conclusion, the CBM gas pooling conditions resulted in the CBM gas enrichment in this study area, which is characterized by good gas-bearing properties on the whole but poor at some parts, i.e., gas content is rich in fields, poor in zones, and some poor zones in rich fields. From east to west in this study area, the CBM gas gradually becomes richer and richer mainly due to the restriction by sealing conditions and structural fault activities. According to the simulation effect of gas deliverability on the theoretical critical desorption pressure, the CBM gas content is forecasted, the result of which agrees well with the actual data. Thus, this forecasting method is proved to be reliable and practical. In view of the differences in CBM gas enrichment degrees and fracturing effects, the concept of CBM gas development unit is introduced; from the latter period of CBM gas production, it is shown that the CBM gas well deliverability matches well with the division of development units.
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