摘要
准噶尔盆地西北部白垩系胜金口组油气资源丰富,但沉积体系还存在争议。综合利用岩心、录井、测井及地震资料,对准噶尔盆地西北部春光探区白垩系胜金口组进行研究,精细刻画了K_(1)sⅠ、K_(1)sⅡ两个小层沉积微相类型及展布,探讨了沉积体系对油气富集规律的影响。结果表明:该区胜金口组主要发育辫状河三角洲-湖泊沉积体系,沉积微相类型为辫状河三角洲前缘水下分流河道、水下分流河道间、河口坝、滩坝及湖泥;辫状河三角洲前缘水下分流河道及滩坝微相为优质储层。K_(1)sⅠ发育三个辫状河三角洲朵体,每个朵体向东南方向延伸,K_(1)sⅡ小层继承了K_(1)sⅠ小层沉积格局,滩坝微相沿辫状河三角洲前部发育。沉积微相控制储层展布,进而影响油气富集,辫状河三角洲前缘水下分流河道及滩坝砂体均为中高孔-中高渗优质储层,有利于油气富集。
The Cretaceous Shengjinkou formation in the northwest of Junggar basin is rich in oil and gas resources,however there still exists controversy on sedimentary system.Based on the comprehensive use of core,logging,logging and seismic data,the Cretaceous Shengjinkou formation in Chunguang exploration area in the northwest of Junggar basin is studied,the sedimentary micro-facies types and distribution of K_(1)sⅠand K_(1)sⅡare finely characterized,and the influence of sedimentary system on the law of oil and gas enrichment is discussed.The results show that the Shengjinkou formation mainly develops braided river delta-lacustrine sedimentary system,and the sedimentary micro-facies are underwater distributary channel in the front of braided river delta,underwater distributary channel,estuary bar,beach bar and lacustrine mud.The underwater distributary channel and beach bar micro-facies in the front of braided river delta are high-quality reservoirs.Three braided river delta lobes are developed in K_(1)sⅠ,and each lobe extends to the southeast.K_(1)sⅡsublayer inherits the sedimentary pattern of K_(1)sⅠsublayer,and beach bar micro-facies are developed along the front of braided river delta.Sedimentary micro-facies control the distribution of reservoirs,and then affect the enrichment of oil and gas.The underwater distributary channel in the front of braided river delta and beach bar sand bodies are high-quality reservoirs with medium high porosity-medium high permeability,which is favorable for oil and gas enrichment.
作者
陈峰
CHEN Feng(Exploration&Development Research Institute of Henan Oilfield Company,SINOPEC,Zhengzhou,Henan 450000,China)
出处
《石油地质与工程》
CAS
2022年第4期12-17,共6页
Petroleum Geology and Engineering
基金
中国石化集团公司重大专项“准噶尔盆地大中型油气田目标评价与勘探关键技术”子课题(P17001-4)。
关键词
春光探区
胜金口组
油气富集
沉积微相
有利相带
Chunguang exploration area
Shengjinkou formation
oil and gas enrichment
sedimentary microfacies
favorable facies zone
