摘要
本文在深入研究天然气在多气源条件下扩散机制的基础上,提出了多气源条件下天然气扩散量的估算方法,并将其应用于大庆长垣以东地区深层,建立了该区深层天然气损失的扩散地质模式,合理地确定出天然气发生扩散散失的地质时间,准确地估算了该区侏罗系和登二段两套气源岩扩散至地表的损失量,其结果约为1.27×10^(12)m^3,约占总生气量的6.54％,表明扩散作用是远景资源评价中不可忽视的重要因素。同时证明所建立的方法用于研究多气源条件下天然气的扩散损失量是可行的。
Based on the study of natural gas diffusion mechanism undermulti-source conditions, this paper comes up with the estima-tion method for natural gas diffusion under the multi-sourceconditions. This method has been used for the deep layer in thearea east of Daqing placanticline to establish diffusion geologi-cal model for natural gas loss in the deep layer.It reasonablydetermines the geological time for commencement of naturalgas diffusion and accurately estimates thc loss of natural gasdiffusion to the surface from the two sets of Jurassic and sec-ond member of Denglouku Formation source rocks in this area.The result is about 1.27 × 10^(12)m^3, accounting for 6.54 percentof the total generated gas volume. This indicates that diffusionis an important factor that cannot be neglected in assessment ofprospect resources. Meanwhile, the established method is alsoconfirmed to be feasible for pudying the loss volume of naturalgas dispersion under the multi-source conditions.
关键词
深层
天然气扩散
多气源条件
天然气勘探
Daqing placanticline
deep layer
natural gas diffusion
multi-source conditions.
