Characteristics and diagenesis evolution of ultra-deep Bashijiqike Formation reservoir in Bozi Section of Kelasu structure belt,Kuqa Depression
The types of diagenesis of Bashijiqike Formation reservoir in Bozi Section are diverse,and the diagenesis evolution is complex in Kelasu structural belt of Kuqa Depression.Based on the observation and description of cores,multiscale microscopic analysis,and related reservoir physical property analysis,the characteristics of petrology,reservoir and diagenesis of Bashijiqike Formation in Bozi Section were systematically studied,and the diagenetic evolution sequence of the reservoir was further established.The research showed that the reservoir mainly underwent four types of diagenesis,namely compaction,cementation,dissolution,and metasomatism,and strong vertical and lateral compaction during the development and evolution process of the reservoir in the study interval after its burial.There are various types of cement,mainly calcite,dolomite and gypsum,followed by quartz and albite,and autogenic hematite is common.In addition,analcime cement is also found in local intervals of wells Bozi102,Bozi21 and Bozi22.The most objects of dissolution are feldspar particles,felsic cuttings and quartz particles.Carbonate cements are also dissolved in partial intervals of wells Bozi102,Bozi21 and Bozi22,and very few carbonate cements are dissolved.The metasomatism developed in the reservoir mainly involves the replacement of quartz,feldspar,felsic rock debris and other debris particles with carbonate and gypsum cement.The basic diagenetic evolution process of Bashijiqik Formation reservoir in Bozi Section is early compaction → feldspar dissolution/quartz and albite cementation→ carbonate cementation/first phase gypsum cementation/quartz dissolution in the first stage→carbonate cementation/second phase gypsum cementation in the second stage→ analcime dissolution/feldspar dissolution.
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维普
