阜康凹陷上乌尔禾组层序格架建立及有利砂体分布

Establishment of sequence framework and distribution of favorable sand bodies in Permian Upper Wuerhe Formation,Fukang Sag,Xinjiang

为明确新疆阜康凹陷上乌尔禾组砂体展布及勘探前景,结合野外露头、钻井资料、地震响应特征,利用高分辨率层序地层学划分方法,划分上乌尔禾组层序。通过物源及沉积体系分析,明确砂体垂向叠置及平面展布特征,刻画上乌尔禾组有利砂体目标。井震结合、单井-连井分析、系统搭建地层格架大剖面,识别层序地层等时界面,划分出一个长期旋回和3个中期旋回,明确了上乌尔禾组三分模式。受三大古凸控制、物源及沉积特征影响,乌一段以填平补齐方式发育在凹槽区,规模砂体叠置连片发育。结合高密度三维资料,识别有利目标,近一步扩大阜康凹陷勘探规模。

Based on the study of outcrop data,drilling data,seismic response characteristics,and high-resolution sequence stratigraphy,the stratigraphic sequence of Upper Wuerhe Formation in Fukang Sag,Xinjiang is classified,the vertical superposition and plane distribution characteristics of sand bodies are defined,and the favorable sand body targets are characterized,so as to explore the distribution and exploration prospects of Upper Wuerhe Formation sand bodies.Through the comprehensive analysis of drilling and seismic data and the analysis of single well and connected well,the stratigraphic framework large section is established systematically and the isochronous interface of sequence stratigraphy is identified,which lead to the division of one long-term cycle and three middle cycle and to the determination of three-division model for Upper Wuerhe Formation.The results show that the first member of Upper Wuerhe Formation developed in the groove area in the way of filling and replenishment under the control of the three paleo-lower uplifts and the influence of provenance and sedimentary characteristics.In combination with high-density 3D seismic data,favorable targets in the area are identified,and the exploration scale of Fukang Sag is further expanded.