巴喀油田八道湾组致密砂岩储层沉积特征

Sedimentary Characteristics of Tight Sand Reservoirs of Badaowan Formation of Baka Oilfield

为分析清楚巴喀气藏主力层位八道湾组的沉积特征和储层变化,通过对巴喀地区岩心、测井、地震等多方面资料分析,识别出了该组各种相标志(岩石成分、岩性、泥岩颜色、沉积构造特征、岩石粒度、电测曲线及地震相等),在此基础上,厘定了巴喀地区八道湾组主要沉积相、亚相和微相类型。八道湾组主要发育辫状河三角洲平原亚相,可进一步划分为辫状河道、废弃河道,泛滥平原和河漫沼泽4个微相,并在此研究基础上建立了与之对应的沉积相模式,为气藏开发奠定了基础。

In order to analyze clearly the sedimentary characteristics and reservoir variation of Badaowan Formation of main reservoirs of Baka Gas Fields,based on the analyses of the data of core,well logging and seismic,etc.,all kinds of facies markers including rock composition,lithology,argillite color,sedimentary structure characteristics,rock grains,logging curves and seismic facies,etc.) are indentified.Based on the study above,the types of main sedimentary facies,sub-facies and microfacies are determined.It is determined that Badaowan Formation mainly develops sub-facies sedimentary system in braid river delta plain,which can be further divided into 4 microfacies,namely,braided channel,abandoned channel,flood plain and flood plain swamp.Based the study results above,corresponding sedimentary facies mode is established,which sets a foundation for the development of gas reservoirs.