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首页> 外文期刊>Journal of South American earth sciences >Using gas geochemistry to delineate structural compartments and assess petroleum reservoir-filling directions: A Venezuelan case study
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Using gas geochemistry to delineate structural compartments and assess petroleum reservoir-filling directions: A Venezuelan case study

机译：委内瑞拉案例研究：利用天然气地球化学来描绘构造隔层并评估油气藏充注方向

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摘要

Here we examined the light hydrocarbon and nitrogen content and isotopic signatures of eleven gaseous samples in order to evaluate lateral intra-reservoir continuity in a Venezuelan reservoir in the central area of Lake Maracaibo Basin. At least three single compartments, located in the northern-central and southern parts of the reservoir, are revealed by nitrogen concentrations showing clear step-like compositional breaks. The occurrence of step-breaks was also supported by the isotopic signature of individual hydrocarbon compounds in the range of C_1— C_4 alkanes. Samples presented only slight differences in N_2 and hydrocarbon gas compositions within the central and northern parts of the reservoir, and therefore it was not possible to infer structural barriers in coherence with the geological section. Some oil bulk parameters corroborate gradual changes that provide additional information on the reservoir-filling history, thus suggesting that the lateral physical—chemical equilibrium of fluids was not reached in this reservoir.
机译：在这里，我们检查了11个气态样品的轻烃和氮含量以及同位素特征，以评估马拉开波湖盆地中部委内瑞拉储层的横向储层内部连续性。氮浓度显示储层中北部和南部至少有三个单独的隔间，显示出明显的阶梯状组成破裂。在C_1–C_4烷烃范围内，单个烃化合物的同位素特征也支持了分步中断的发生。样品在储层中部和北部的N_2和烃类气体组成仅存在细微差异，因此无法推断与地质剖面一致的结构性障碍。一些油体积参数证实了逐渐变化，从而提供了有关储层充注历史的更多信息，因此表明在该储层中未达到流体的横向物理化学平衡。

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