姬塬地区长6储层宏观非均质性与含油气性关系

Relationship between macroscopic heterogeneity and oil-gas bearing property of Chang 6 reservoir in Jiyuan area

利用岩心等资料统计,通过计算姬塬地区长6段储层渗透率非均质性参数、分层系数、砂岩密度和钻遇率等量化指标,从层内、层间、平面三个方向研究储层的非均质程度,最后根据平面含油饱和度讨论储层的非均质性与含油气性之间的关系。结果表明,受沉积环境及成岩作用影响,姬塬地区长6段储层的两个小层(长61和长62亚段)非均质性较强,且平面非均质性突出;储层的含油气性与砂体的展布特征及物性具有较强的相关性,即物性最好、砂体厚度最大的河道地区,储层的含油饱和度最高,含油气性最好。

By using statistics such as the core, through calculating the quantitative indexes of Chang 6 area, such as the reservoir permeability heterogeneity parameters, stratification coefficient, sandstone density and drilling encounter rate, from three directions, namely a layer, interlayer and plane, the reservoir heterogeneity degree was studied. Ultimately, according to the plane of oil saturation to discuss the relationship between reservoir heterogeneity and oil-bearing property. The results show that under the influence of sedimentary environment and diagenesis, the two sub-layers of Chang 6 reservoir in Jiyuan area(Chang 61 and Chang 62) are highly heterogeneous, and the plane heterogeneity is prominent. There is a strong correlation between oil and gas properties of reservoir and distribution characteristics and physical properties of sand body. That is to say, the channel area with the best physical properties and the largest sand body thickness has the highest oil saturation and the best oil and gas properties.