基于成岩储集相测井响应特征定量评价致密气藏相对优质储层——以SULG东区致密气藏盒8上段成岩储集相为例

Quantitatively Evaluating Relatively Beneficial Reservoir of Tight Gas Reservoirs Based on Diagenetic Reservoir Facies Log Response Feature:Taking the Diagenetic Reservoir Facies Classification of the He 8-1 in the Tight Gas Reservoir of SULG East Area as

致密砂岩储层成岩作用最终决定着储层的储集性能,其成岩储集相的定量评价及其与优质储层的分布关系在储层评价中显得尤为重要。基于SULG东区致密气藏盒8上段成岩储集相特征研究,阐明了Ⅰ类、Ⅱ类成岩储集相反映出致密砂岩优质储层形成的地质特点,成为筛选相对优质储层的"甜点"。通过岩心鉴定不同类别成岩储集相的测井响应特征及其参数敏感性的综合评价分析结果,建立了成岩储集相测井多参数定量分类综合评价指标体系,利用灰色理论集成及相关分析技术,实现了利用测井资料定量综合评价划分致密气藏成岩储集相及其优质储层"甜点"。通过筛选的优质储层确定出了该区盒8上段由北向南曲流河三角洲平原的含气有利区叠置连片的规模和范围,有效地反映出了该区致密气藏储层含气有利区的分布规律、延伸方向及非均质性特征,为致密气藏增储上产提供了有利目标和井区。

In tight sandstone reservoir, diagenesis ultimately determines the performance of the reservoir. The quantitative evaluation of diagenetic reservoir facies and its relationship with distribution of high-quality reservoir is particularly important in reservoir evaluation. Based on the research of diagenetic reservoir facies feature of the He 8-1 in the tight gas reservoir of eastern SULG area, it clarified that the type Ⅰ , type Ⅱ of diagenetic reservoir facies can reflect the geology characteristic of the quality reservoir formation of tight sandstone which can be the ＂sweet spot＂ to filter the relatively beneficial reservoirs. A comprehensive evaluation system of diagenetic reservoir facies logging multi-parameter quantitative classification was established based on the comprehensive analysis and evaluation results of the logging response characteristics and parameter sensitivity of different diagenetic reservoir facies types by core identification. By using Grey Theory Integration and some related analytial technologies, the diagenetic reservoir facies and relative high-quality reservoir ＂sweet spot＂ of tight gas reservoir could be quantitatively evaluated and classified with logging data. The scale and scope of the favorable gas reservoir in this north-south meandering river delta plain of He 8-1 were identified with the beneficial reservoir filtered before, which presented the distribution pattern,extension direction and heterogeneity of the beneficial gas reservoir of this tight gas reservoir. All of these can provide a target potential well and area for oil recovery.