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陕北斜坡构造带发育陆相页岩,部分页岩气开发井已经投产,但针对页岩气排烃方式、赋存过程的研究仍较薄弱,对页岩气储量的估算还存在不确定性。这些问题的解决有助于认识资源潜力、降低勘探风险。基于页岩气解析实验可以获得气体化学组成和碳同位素组成数据,其不仅为页岩气的成因研究及形成过程研究提供基础信息,还能解决上述地质机理及储量计算的问题。研究表明,研究区页岩气属于典型的油型气;页岩的吸附作用具有选择性,页岩优先吸附重烃气体和具13 C的甲烷分子;页岩气的初次运移遵循小分子组分优先运移的规律;研究区页岩气的地质赋存过程为先吸附再溶解后游离。
In northern Shaanxi, continental shales develop in shale tectonic belt and some shale gas development wells have been put into production. However, the research on the hydrocarbon expulsion and shale gas evolution processes in shale gas reservoirs is still weak and there are still some uncertainties in estimation of shale gas reserves . The solution of these problems helps to understand the potential of resources and reduce exploration risks. Gas chemistry composition and carbon isotope composition data can be obtained based on shale gas analysis experiments, which not only provide basic information for the genesis and formation process of shale gas, but also solve the above problems of geological mechanism and reserves calculation. The study shows that the shale gas belongs to the typical oil gas in the study area; the adsorption of shale is selective; the shale preferentially adsorbs heavy hydrocarbon gas and 13 C methane molecules; the initial migration of shale gas follows the pattern of small molecule group The law of preferential migration; the geological storage process of shale gas in the study area is the first adsorption and re-dissolution free.