Abstract: The Shahejie Group in the Lengdong-Leijia region in Liaohedepression is mainly composed of very thick conglomerates,It belongs to a fan-delta sedime ntary system.Since thereservoir is close to the sources formation,the sorting is bad and its mudy interlayers are notwell developed.So microfacies can not be subdivided by use of single index such as sand-mudratio SP,NGS logging curves and other traditional methods. Based on the single-well faciesanalysis in a system-cored well,a lithologic model was established by using sonic-density-netron cross plots.In accordance with the above model,nonglomerate lithofacies were studied.By synthesizing the results of single-well-facies anlysis and lithofacies,with a combination of sedimentary environment and lithofacies,a study of sedimentary microfacies was carried out.Also,the relation between various sedimentary microfacies,physical properties andoilgas abundance are studied,which provided a reliable geologic basis for the prediction ofareas with good reservoir zone,a study of reservoir heterogeneity and a comprehensive evaluation of the reservoir.Meanwhile,this paper explores a new approach to study the conglom-erate sedimentary microfacies,which is also useful in other areas.

Key words: Liaohe sag, Shahejie group, hydrocarbon reservoir of conglomerate, sendi-mentation microfacies, facies, logging interpretatior

摘要： 辽河凹陷冷东-雷家地区沙河街组发育一套以厚层、巨厚砾岩为主的扇三角洲沉积体系.储层近物源造成分选差且泥质隔夹层个发育,沉积微相若单纯应用砂泥比及自然电位、自然伽玛等测井曲线形态的传统方法则无法细分.在系统取心井单井相研究的基础上,应用测井声波、密度、中子交会建立了该区的岩性模型并依此进行了岩石相的研究.综合单井相及岩石相的研究成果,即以沉积环境特征及岩石相相结合的方法进行沉积微相的研究,并研究各沉积微相与物件及油气富集程度的关系,为预测有利的储集相带、储层宏观非均质性及储层综合评价提供了可靠的地质基础,同时也探索了一种砾岩储层沉积微相研究的新方法.

关键词: 辽河凹陷, 沙河街组, 砾岩油气藏, 沉积微相, 岩相, 测井解释