Characteristics and Genesis Mechanism of High-quality Clastic Reservoirs in Zhuanghai Area of Jiyang Depression
Oil and gas resources are rich in Zhuanghai Area of Jiyang Depression.The proven reserves are high in the Neocene and buried hill strata,while the degree of drilling and understanding of the Paleogen is low,and the characteristics of the Paleogen reservoirs and the genesis mechanism of high-quality reservoirs are poorly under-stood.For this reason,we have studied the petrological characteristics,type of diagenesis,spatial characteristics of clastic reservoirs and the controlling factors of high-quality reservoirs in the Lower Dongying Member-Shahejie For-mation in Zhuanghai Area through the means of analysis such as cores,thin sections,scanning electron microsco-py,etc.The results show that the clastic reservoirs of the Lower Dongying Member-Shahejie Formation in Zhuang-hai Area have a small distribution range and thin thickness,and the reservoirs are dominated by sandstones deposi-ted rapidly near sources with low rock maturity.The compaction is the main reason for destroying the pore space of the reservoirs.The cementation,mainly carbonate cementation,has caused further damage to the pore space.The dissolution of organic acid is an essential factor for forming secondary pore space and increasing pore space in the reservoir.The overall pore type is dominated by secondary pores and primary pores are only retained to a relatively high degree in the reservoirs of the Lower Dongying Member in the northwest source area,and the reservoir fractures are few.The high-quality reservoirs is mainly controlled by three conditions:sedimentary conditions,diagenetic modification,and fracture communication.The glutenite reservoirs are favorable exploration targets with high rock maturity,far from calcium sources,close to acid sources,and fracture communication.This study can provide the geological basis for the exploration and development of the Paleocene system in Zhuanghai Area.
diagenesisclastic reservoir qualityreservoir genesissubtle oil and gas reservoirZhuanghai AreaJiyang Depression
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