热德拜油田侏罗系储集层沉积特征

Sedimentary Characteristics of Jurassic Reservoir in Redebai Oilfield,Kazakhstan

热德拜油田是中国石油在哈萨克斯坦收购的MMG公司的两个主力油田之一,已经投入开发40多年。前人认为热德拜油田侏罗系储集层为浅海相或滨海相沉积,这与目前油藏开发过程中出现储集层非均质性强的现象相矛盾。利用构造、岩性、测井等资料建立了沉积相模式,分析认为,侏罗系储集层为浅水辫状河三角洲沉积,并识别出了沼泽、河道间、心滩和分流河道等微相,其中分流河道微相发育了主要的储集体。研究认为沉积微相对开发效果有明显的影响。

Redebai oilfield is one of two oilfields purchased by PetroChina in Kazakhstan and has been put into development for more than 40 years.Previous studies showed its Jurassic reservoir was shallow marine or offshore deposit.But it is contradictory to strong heterogeneity existing in the reservoir during present development.This study sets up sedimentary model based on the structural,lithology and well logging data,and suggests from analysis that the Jurassic reservoir belongs to a shallow-water braided river delta deposit with such swamp,interchannel,channel bar and distributary channel microfacies,among which the distributary channel microfaces is the main reservoir bed.The study shows that effects of these sedimentary microfacies on development effectiveness are obvious.