安塞油田东部长6储层成岩作用分析

Reservoir Diagenesis and Porosity Evolution Characteristics of Chang 6 Reservoir in the Eastern Ansai Oilfield

根据物性、高压压汞、铸体薄片、电镜扫描、X衍射等资料等对安塞油田东部长6储层的成岩作用进行了研究。研究结果表明,安塞油田长6储层物性较差,孔喉整体细小,岩性以细、粉粒长石砂岩为主,碎屑成分复杂,成分成熟度低,结构成熟度低到中等。压实作用使储集层的原始孔隙空间损失;胶结作用不仅破坏了部分原生孔隙,而且使部分次生溶孔遭到破坏;交代作用使岩石结构和孔隙度发生变化;溶解作用使储层物性得到了改善;有机质充填作用抑制了岩石生长,对储层物性改善有一定建设性作用。

By comprehensive use of techniques of physical property analysis and high pressure mercury,cast thin section,scanning electron microscope,Chang 6 reservoir in the eastern Ansai Oilfield is studied.The results show that Chang 6 reservoir is of poor physical property,pore throat is small with powder feldspar sandstone,complex clastic composition,low compositional maturity and low to moderate textural maturity.Original pore space of reservoir is missed by compaction,cementation destroys part of the primary porosity and secondary porosity,the dissolution improves the reservoir properties.By dividing the diagenetic sequence,based on the impact of diagenesis on reservoir properties,reservoir porosity evolution is analyzed,it indicates that early porosity is 34.96% in 6 reservoir,currently it is 11.01%.