Sufyan油田Abu Gabra组沉积微相识别方法

摘要

Controlled by the multiple source areas from North Babausa Uplift and South Tomate Uplift,the well-developed small deltas sedimentation in Abu Gabra Formation of Sufyan Oilfield is widely-distributed in the planar view and takes thin interbeds on the huge thick lake-facies mudstone vertically.The lithologies from the drilling,core,mud logging data and moreover the facies markers such as the their cyclicities were summarized,through the relationship between the rock and electricity and furthermore log facies analyses,the sedimentary microfacieses were classified for Abu Gabra Formation with the help of the principal component analyzing method,thus the deltas facies can be further divided into the following 7 types:distributary channel,mouth bar,floodplain mud,underwater distributary channel,underwater inter-channel,underwater mouth bar and shallow-shore lake mud.Integrated with the seismic attribute analysis and inversion results,the planar distribution laws of the microfacieses and the control on the reservoir sand bodies were characterized for the sandstone group of Abu Gabra Formation,all these achievements have provided powerful evidences for the initial development of the oilfield.%受北部Babausa隆起和南部Tomate隆起多物源控制,Sufyan油田Abu Gabra组发育小型三角洲沉积,纵向呈薄互层覆于巨厚湖相泥岩上,平面数量多、分布广.总结了钻井、取心、录井资料岩性及其旋回性等相标志,通过岩电关系及测井相分析,应用主成分分析法对Abu Gabra组进行沉积微相划分,将三角洲沉积相进一步划分为分流河道、河口坝、泛滥平原泥、水下分流河道、水下分流间湾、水下河口坝和滨浅湖泥7种沉积微相,综合地震属性分析和反演成果描述了Abu Gabra组砂岩组沉积微相平面分布规律及对储层砂岩的控制,为油田初期开发提供了重要依据.