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成岩作用及物性演化的研究对致密砂岩储层和致密油开发具有重要意义.综合利用岩石铸体薄片鉴定、扫描电镜、X衍射分析、流体包裹体分析等测试手段,对研究区致密储层进行详细研究.研究表明:深水重力流砂体粒度细,孔喉组合以细孔-微喉型为主,物性差,是一套典型的特低渗透储层;目前正处于中成岩B期,其成岩演化序列为:机械压实作用/方解石胶结→凝灰物质水解蚀变/云母水化/伊利石胶结/绿泥石胶结/石英溶蚀→早期长石溶蚀/石英加大/碳酸盐灰泥重结晶/早期碳酸盐胶结物溶蚀→晚期长石溶蚀→铁方解石胶结,成岩环境主要经历了碱性→酸性→弱碱性的转换过程;距今约99~118Ma的早白垩世,研究区储层发生了连续的2期油气充注;储层物性演化史表明早成岩期储层的成岩作用对储层物性影响大,使储层已经致密化,研究区具有先致密后成藏的特性.
The study of diagenesis and physical evolution is of great significance for the development of tight sandstone reservoirs and tight oil.The tight reservoirs in the study area are comprehensively studied by means of thin slice identification, scanning electron microscopy, X-ray diffraction analysis and fluid inclusion analysis. The study shows that the gravity flow in the deep-water gravity sand body is fine and the pore-throat combination is mainly micropore-micro-throat with poor physical properties. It is a typical ultra-low permeability reservoir and is currently in the mid-diagenetic stage B, The evolutionary sequence is: mechanical compaction / calcite cementation → tuffaceous material hydrolysis alteration / mica hydration / illite cementation / chlorite cementation / quartz dissolution → early feldspar dissolution / quartz addition / carbonate mortar weight During the Early Cretaceous dating from about 99 to 118 Ma in the Early Cretaceous of the study area, the diagenetic environment mainly experienced the transition from alkaline to acidic to weak alkaline. The evolution history of reservoir physical property shows that the diagenesis of reservoir during early diagenesis has a great influence on reservoir physical property, which makes the reservoir densified, and the study area has the characteristics of first compaction and later accumulation.