摘要
通过对黄龙场-天成寺地区26口井飞仙关组岩心、岩屑薄片等资料分析,结合扫描电镜、物性等研究,认为飞仙关组储层岩石类型主要为(残余)颗粒白云岩、粉-细晶(含灰)白云岩、亮晶鲕粒灰岩、亮晶砂屑灰岩等;储集空间主要包括粒间(溶)孔、粒内溶孔、晶间(溶)孔、(构造、溶蚀)裂缝等。研究区飞仙关组储层的形成与演化主要受到沉积和成岩作用的共同影响。其中沉积作用是储层形成的基础,决定了储层的大致分布范围,最有利于储层形成的沉积相带为台地边缘滩,多沿孤立台地边缘呈环带状或连陆台地呈带状分布;成岩作用是储层形成的关键,最有利于储层形成的成岩作用是白云石化和埋藏溶蚀作用。
Based on the analysis of the cores and cuttings of the Feixianguan Formation in 26 wells in the Huanglongchang-Tianchengsi area, combined with the scanning electron microscopy and physical properties, it is believed that the rock types of the Feixianguan Formation are mainly (residual) granular dolomite, powder-fine grain (ash-containing) dolomite, bright-grained glutenite, bright-grained sandstone, etc.;the reservoir space mainly includes intergranular (dissolved) pores, intragranular dissolved pores, intercrystalline (dissolved) pores, (structure, erosion) cracks, etc. The formation and evolution of the Feixianguan Formation reservoir in the study area are mainly affected by sedimentation and diagenesis. The sedimentation is the basis of reservoir formation, which determines the approximate distribution range of the reservoir. The most favorable sedimentary facies zone for reservoir formation is platform margin beach, and most of them distribute in zonal or continental platform along isolated platform margin. Diagenesis is the key to reservoir formation, and the most favorable diagenesis for reservoir formation is dolomitization and burial dissolution.
