基于FMI测井的火成岩裂缝相发育模式——以准噶尔盆地中拐凸起石炭系火成岩为例

Study on Fracture Facies Development Pattern of Volcanic Rock Based on FMI Logging:A Case Study of Carboniferous Volcanic Rocks in Zhongguai Uplift in Junggar Basin

石炭系火成岩油气藏是准噶尔盆地中拐凸起最重要的油气藏类型,裂缝对储层物性具控制作用。为加强对中拐凸起石炭系裂缝发育规律的认识,以FMI测井资料为主,结合常规测井、录井及岩石薄片等地质资料,建立4种FMI测井裂缝相。通过分析建立了裂缝发育特征与FMI裂缝相的配置关系,中拐凸起石炭系发育上部表生裂缝带和下部深埋裂缝带,表生裂缝带主要发育有效裂缝相、直劈扩大缝相、溶蚀孔隙相;深埋裂缝带主要为无效裂缝相和有效裂缝相混合发育,表生裂缝带裂缝更为发育。不同裂缝相的配置关系对储层物性改造效果具差异,研究表明,直劈扩大缝相是储层物性改造的主控因素,表生裂缝带更易形成优质储集层。

The Carboniferous volcanic reservoir is the most important reservoir type in the Zhongguai uplift of the Junggar basin with effect of fracture on it.In order to further understand the pattern of development in Zhongguai uplift.Based on the FMI logging data,combined with the conventional logging data,logging and rock thin slices,4 kinds of fractured facies have been established.Through the analysis,the relationship between the fracture development characteristics and the fracture facies.The upper epigenetic fracture belt and the lower deep buried fracture belt are developed in the Zhongguai uplift abduction Carboniferous system.The epigenetic fracture belt mainly develops the effective fracture facies,the enlarged split joint facies and the dissolution pore facies,and the deep buried fracture belt is mainly mixed with the ineffective fissure facies and the effective crack facies.Development,the fracture belt of the epigenetic fracture is more developed.The distribution of different fractured facies also has different effects on the physical properties of the reservoir.Through the study,it is shown that the enlarged split joint is the main controlling factor of the physical property transformation of the reservoir,and the epigenetic fracture belt is more likely to form a high quality reservoir.