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- Title
Geological characteristics of coal bed methane and optimization for favorable productive intervals of Yangmeishu syncline in Liupanshui area.
- Authors
Shan Yan-sheng; Bi Cai-qin; Chi Huan-peng; Wang Fu-guo; Li Hui
- Abstract
Based on the drilling data and coal petrographic lest data of three coalbed methane parameter wells, we analyzed the coalbed methane geological characteristic, re-estimated the coalbed methane geolog ical resource and optimized five favorable target intervals of Yangmeishu syncline in Liupanshui area. Simultaneously, the separate pressure production test was performed in the three favorable intervals of Well Yangmeican l, and finally the productive gas production effect was achieved. The results show that thin and medium-thickness coal seam groups in Longtan Formation of Upper Permian are developed in this area, the recoverable coal seams are dominated by primary structure and possess large accumulation thickness; the gas content,gas saturation and relative reservoir ratio are high enough,the average permeability is 0.229 × 10-3μm2,the condition of coalbed methane accumulation and development is favorable.Combined with the key parameters of coalbed methane enrichment and exploitation, 5#, 7#, 13#, 15# and 23# are regarded as favorable intervals of coalbed methane exploration and development in this area.According to the combination principle of quality and similarity in production layer,we selected 5#, 7# and 13# coal seams of Well Yangmeican 1 to conduct separate pressure production test.During the drainage process, the casing pressure appeared early and the pressure drawdown distribution expanded rapidly, interlayer interference did not show in this process.The resource superiority of multi-layer commingled production is fully exerted; the favorable gas production effect of 4 656m3/d in maximum daily output and 3 600m3/d in steady daily output was acquired. This outcome creates new heights of single well daily output and stable gas production of coalbed methane vertical well in southwest area, and achieves a major breakthrough of regional coalbed methane exploration.
- Subjects
COALBED methane; PETROLOGY; PARAMETER estimation; RING formation (Chemistry); THICKNESS measurement
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 1, p122
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.12.008