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根据天然气扩散、物质平衡原理、烃浓度封闭机理和气源岩层之间扩散时间的相互匹配关系建立了评价泥质气源岩层内天然气扩散损失量的6种扩散模式以及不同模式下气源岩层天然气扩散损失量的计算方法,为定量评价部分烃浓度封闭期间气源岩层天然气扩散量、页岩气扩散量提供了可能。源岩层在受到部分烃浓度封闭期间的天然气扩散量,假设此期间不存在烃浓度封闭,则为源岩层的扩散气量与该期间上覆气源岩的扩散气量之差。利用所得模型对黔南坳陷黄页1井九门冲组页岩进行了实际应用,结果显示,黄页1井九门冲组页岩不考虑烃浓度封闭条件下的扩散气量远大于考虑烃浓度封闭条件下的扩散气量。在评价泥质气源岩层扩散量时如果存在烃浓度封闭作用,应加以考虑。
According to the natural gas diffusion, the principle of material balance, the mechanism of hydrocarbon concentration and the diffusion time between gas source rocks, six diffusion models for evaluating the diffusion loss of natural gas in the muddy gas source rock are established, and the natural gas The calculation method of diffusion loss provides a possibility for quantitative evaluation of natural gas diffusion and shale gas diffusion of gas source rocks during the period of partial hydrocarbon concentration. The amount of natural gas diffused from the source rock during the closure of the part of the hydrocarbon concentration is assumed to be the difference between the amount of diffused gas from the source rock and the amount of diffusive gas overlying the source rock during the period, assuming no closure of the hydrocarbon concentration during this period. The model was applied to the practical application of the Shale of the Jimenting Formation in the Yellow 1-well well in the southern Qiannan Depression. The results show that the amount of diffusible gas under the closed condition of the Jimenchuang shale of the Yellow 1-well, excluding the hydrocarbon concentration, is much larger than that of the hydrocarbon concentration, Under the conditions of the proliferation of gas. In the evaluation of muddy gas source rock formation diffusion volume if there is a closed role of hydrocarbon concentration, should be considered.