Abstract
In order to explore the types of diagenesis in Sudeerte area, through core and thin slice identification, it is clear that the Xing’anling oil layer is mainly affected by compaction, cementation, andrecrystallization. The compaction is mainly early compaction, late pressure dissolution is not obvious; cementation presents two forms of crystalline quartz and amorphous opal; recrystallization is manifested as the conversion process of opal t-ochalcedony quartz.
Highlights
The composition, grain composition, grain structure of the rock will be different[67].Microscopic identification and analysis show that the particles in the rocks in this area are mostly explosive quartz crystal debris, tuff debris and glass debris, with a content of 40-50% or even higher; the roundness is poor and belongs to pyroclastic sedimentary rock class
The interstitial materials are mainly glass debris and small rock debris; mostly siliceous cement formed by glass debris devitrification
Compaction includes early mechanical compaction and late pressure solution. It is dominated by early mechanical compaction, and late pressure solution is not obvious
Summary
The Hailar Basin base is composed of Indosinian granites and Budate Group in the west of the Herzegovina. The bottom of the Jurassic and Cretaceous are the main deposits in the basin, from bottom to top:the upper Jurassic Xing'anling oil formation volcanic rock intercalation, the lower Cretaceous Tongbomiao Formation, Nantun Formation,Damoguaihe Formation,Yimin Formation and Qingyuangang Formation, Upper Cretaceous Beier Lake Group Qingyuangang Formation, Upper Tertiary Huchashan Formation and Quaternary[1]. The main oil layers developed in the Sudeerte oil field are the Xing'anling oil layer and the Budate group oil layer. The main oil layers are located in the Sudeert fault uplift zone, which is mainly divided into multiple large fault blocks by the northeast and near east-west faults. The micro-cracks and secondary dissolution pores are relatively developed, the micro-cracks are not filled, and the connectivity is good. Most of the feldspar and cuttings particles are partially dissolved, forming secondary dissolved pores
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