低煤阶煤层气藏水动力条件的物理模拟实验

水动力条件是影响低煤阶煤层气成藏的重要因素之一。利用煤层气成藏模拟装置模拟了低煤阶煤层气藏水动力条件。研究表明, 强烈的水动力交替作用使煤层气藏中的H2S 含量降低、甲烷碳同位素变轻、甲烷含量降低、氮气和二氧化碳含量增大。这些变化对煤层气成藏造成不利影响。同时, 对鄂尔多斯盆地东缘水动力条件进行了分析, 对比了煤层气藏保存条件的差异。

Experimental Study on Physical Modeling of Hydrodynamic Condition in Low-Rank Coalbed Methane Reservoir

Hydrodynamic condition is one of the critical factors that affect low-rank coalbed methane (CBM) accumulation. The CBM accumulation model is used to simulate the hydrodynamic condition of low-rank coalbed methane reservoir. Study shows that H2S and methane concentration will be reduced, δ13C1 be lightened, N2 and CO2 contents be increased under the strong hydrodynamic alternation, which have unfavorable impact on CBM accumulation. Also, this paper analyzes the hydrodynamic condition in eastern margin of Ordos basin and discusses the difference among conservation conditions in CBMreservoirs.