黑龙江滨北地区生物气扩散散失量估算及其研究意义

Estimating Loss Amount of Biogas Diffusion and Its Research Significance in Binbei Region,Heilongjiang Province

在分析黑龙江滨北地区生物气源岩发育及其分布特征的基础上,建立了生物气扩散散失的地质模型和数学模型并确定了主要计算参数,建立了一套生物气扩散散失量的计算方法。利用该方法对滨北地区各生物气源岩的扩散散失量进行了估算。计算得到滨北地区生物气源岩生物气的总扩散量约为24.59×1012m3,占其生物气总生成量的20.89%,这表明扩散作用应是造成滨北地区生物气散失的重要原因。由天然气运聚动平衡观点可以得到青山口组一、二、三段,嫩江组一、二段和明水组一段应是最有利于生物气聚集成藏的生物气源岩,姚家组二、三段,嫩江组三段和明水组二段应是较有利于生物气聚集成藏的生物气源岩。

Based on the analysis of development and distribution characteristics of biogas sourcerock in Binbei region, Heilongjiang Province, this paper establishes a method for estimating biogas diffusion loss amount through establishing the geological and mathematical model of biogas diffusion loss amount and determining main calculation parameters. Using the method,this paper calculates the biogas diffusion loss amount of each biogas sourcerock in Binbei region. The result indicates that the total biogas diffusion loss amount in Binbei region is about 24.59× 10^12 m^3 ,20.89% of total biogas generation amount. This indicates that diffusion is the important cause of biogas loss in Binbei region. According to gas dynamic balance principle,the biogas sourcerocks of the first, second and third member of Qingshankou Formation, the first and second member of Nenjiang Formation and the first member of Mingshui Formation are the most favorable biogas sourcerocks for biogas to accumulate. The biogas sourcerocks of the second and third member of Yaojia Formation, the third member of Nenjiang Formation and the second member of Mingshui Formation are more favorable biogas sourcerocks for biogas to accumulate.