摘要
通过自行设计的天然气运移成藏物理模拟仪,对实际岩芯样品进行了高压水溶气运移成藏的物理模拟实验,目的是研究水溶作用对天然气运移指标产生的影响以及水溶气甲烷和乙烷碳氢同位素、C2+/总烃、iC4/nC4等8项地球化学参数的变化。实验结果表明:随着运移距离的增加,水溶气中的非烃CO2含量普遍增大,烃类气体"甲烷化"趋势明显,C2+以上的含量随碳数升高而降低(至C5含量基本可以忽略不计),轻烃组分中的苯和甲苯含量由低(气源)到高(运移距离近)再变低(运移距离远),甲烷碳和氢同位素变化幅度均不大(仍具有略偏正的特征)。认为这些地球化学参数的变化特征对水溶气气藏的识别和油气运移的研究均具有重要的参考价值。
Based on the equipment designed and developed by ourselves, the experiment has been performed to investigate some influence of dissolution on geochemistry parameters (such as δ^(13)C, δD, iC_4/nC_4, etc) of gas dissolved in water during migration by means of real core. The study indicated that the relative abundance of non hydrocarbon (CO_2) and hydrocarbon (CH_4) increased with the growth of distance while the relative abundance of hydrocarbon (C_(2^+)) decreased. The relative abundance of benzene and methylbenzene showed a clear trend during migration while the carbon and hydrogen isotope of methane kept relatively stable,these geochemstry parameters can be regarded as indicators of identification on gas dissolved in water formations.
出处
《天然气地球科学》
EI
CAS
CSCD
2004年第1期32-36,共5页
Natural Gas Geoscience
基金
国家"973"项目"天然气动态形成过程和富集度研究"(编号:2001CB30913)资助.
