Reservoir evaluation using carbon isotope composition of gas
Reservoir evaluation using carbon isotope composition of gas
复制标题
利用气体碳同位素组成评价储层
DOI：
10.3720/japt.72.585
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
H. Iwano
中科院分区：
文献类型：
--
作者：
A. Waseda;H. Iwano
甲烷、乙烷和丙烷的碳同位素组成以及气体样品中的碳氢化合物比率提供了它们的来源(微生物与热源)、热源成分的成熟度、运移引起的成分变化以及生物降解程度的信息。不同来源或不同成熟度的气体的混合也可以使用气体同位素和分子组成进行评估。虽然这些天然气地球化学数据主要用于石油勘探，但它们在开发、生产和经营问题上的应用也在增加。顶空气体分析可用于圈定储集层隔层和产层。如果来自贡献储集层的气体之间存在同位素差异，则可以利用混合生产中的碳同位素组成来分配来自各个产层的贡献。如果该区有足够的参考资料，可以通过气体分子和同位素组成来研究生产现场的瓦斯渗漏成因。
Carbon isotope compositions of methane, ethane and propane, and hydrocarbon ratios in gas samples provide information of their origin (microbial vs. thermogenic), maturity of thermogenic component, compositional change due to migration, and extent of biodegradation. Mixing of gases with different origins or different maturities can also be evaluated using gas isotopic and molecular compositions. While these gas geochemical data have been used mainly for petroleum exploration, their applications for development, production and operation issues are also increasing. Headspace gas analyses can be used to delineate reservoir compartments and pay zones. Carbon isotope compositions in commingled production could be used to allocate contributions form individual production zones if isotopic differences exist between the gases from the contributing reservoirs. Origin of gas seepage in production sites could be investigated by the gas molecular and isotope compositions if enough reference data exist in the area.