陆相含油气盆地中白云岩产出的层序类型及其层序地层学分析——以东营凹陷西部沙河街组三段上部白云岩为例

本文以东营凹陷西部沙河街组三段上部白云岩为例，对白云岩产出的层序类型进行了分析，结果表明区内白云岩在不同钻井中产出的层序特征不同，分别与砂砾岩、粉砂岩、泥岩等互层．在上述基础上，运用层序地层学理论对白云岩层进行了层序地层学分析，其为高水位体系域晚期发展阶段的产物，是进积准层序的组成单元。

SEQUENCE TYPES AND SEQUENCE STRATIGRAPHY OF THE DOLOSTONES IN CONTINENTAL OIL-BEARING BASINS:AN EXAMPLE FROM THE UPPER PART OF THE THIRD MEMBER OF THE SHAHEJIE FORMATION,WESTERN DONGYING DEPRESSION,SHANDONG

The analysis of the sequence types of the dolostones in the upper part of the third member of the Shahejie Formation in western Dongying depression,Shandong shows that the characteristics of the dolostone sequence in the study area differ greatly in various boreholes.These dolostones are commonly interbedded with sandstones,conglomerates, siltstones and mudstones.In this paper,the stratigraphic theory was employed to the se-quence stratigraphic analysis of the dolostone horizons,which are interpreted as the prod-ucts of the highstand systems tract during its later stage,and constituent elements of progradational parasequences.