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从资源条件和产出条件两方面分析了织金区块珠藏、比德2个次向斜煤层气井产能差异的主控地质因素。结果表明:2个次向斜均具有较高含气量,具备煤层气高产的资源基础,产能差异主要受产出条件影响;织金区块煤岩兰氏压力较低使煤层气在低压区吸附量大、解吸效率高,比德次向斜煤层埋深大,储层压力高,降压至低压区较缓慢,造成产气上涨慢;煤层埋深大造成的地应力高,渗透率低是制约比德次向斜煤层气井产能的另一个重要因素。
Based on the resource conditions and output conditions, the dominant geologic factors of productivity difference between Zhijindang block and Bidiang coalbed methane wells are analyzed. The results show that both sub-synclines have high gas content, and have the resource base of high CBM productivity. The difference in productivity is mainly affected by the output conditions. The low Rankine pressure of coal in the Zhijin block causes the adsorption of CBM in the low pressure zone Large amount, high desorption efficiency, large buried depth of coal seam in Beide secondary syncline, high reservoir pressure, and slower pressure depressurization to low pressure area, resulting in slow gas-production uplift; high ground stress caused by large buried depth of coal seam and low permeability Another important factor that constrains the production capacity of the Beidi syncline CBM wells.