粒度分析在扇三角洲分类中的应用

在小型断陷湖盆中,扇三角洲沉积分布广、发育时间长、性质各异.辽河断陷的早第三纪湖盆即是一例.根据断陷发育的特点、相模式、沉积水动力作用和岩石相分析结果,作者采用粒度概率曲线分类统计法,对辽河断陷中12个扇三角洲沉积进行定量化成因分类,划分出了6种沉积类型.分类结果不但符合盆地区域构造和沉积发育的客观时空规律,而且深刻地揭示了6种沉积类型储层非均质特征参数间以及开采特点之间的规律性.由此而形成的系统分类模式,在勘探开发早期可以作为对扇三角洲储层进行类比的标准和预测的模式.

THE APPLICATION OF GRAIN SIZE ANALYSIS TO THE CLASSIFICATION OF FAN-DELTAS

In small fault lacustrine basins,the sedimentary fan-deltas are widely spread with a long evolution history and various features.The Paleogene lacustrine basin in the Liaohe Fault could be taken as one of the examples.In this paper,the author quantitatively classified 12 sedimentary fan-deltas of the Liaohe fault basin on the basis of the characteristics of fault development,facies patterns,sedimentary hydrodynamics and lithofacies analysis with the application of the classification and statistics on the probability curves of grain size analysis and six sedimentary types have been divided.Consequently,the classification is not only coincided with the regional structures of the basin and the objective time-space law of the sedimentation,but also reveals the regularities between the nonhomogeneous characteristic parameters of the reservoir beds in the six sedimentary types and those between the features of mining points.Therefore,the established systematic classification model can be regarded as the correlation maker and the prediction model in the reservoir beds of six sedimentary types for their oil/gas exploration and development in early stages.