中国东部第三纪凹陷大部分是箕状断陷(即半地堑)。每个箕状断陷都由陡坡带、深陷带、斜坡带三部分组成。斜坡带一般可占箕状断陷面积的三分之一到二分之一,它是油气聚集的重要部位。近年来在斜坡带上的油气勘探不断取得重要进展。全面分析斜坡带的地质结构、油藏类型及其分布特点是有现实意义的。 Most of the Tertiary depressions in eastern China are half-graben faults. Each half-graben fault by the steep slope zone, deep belt, slope with three parts. The slope zone generally accounts for one-third to one-half of the area of ​​the half-graben, which is an important part of hydrocarbon accumulation. In recent years, significant progress has been made in oil and gas exploration on the slope belt. A comprehensive analysis of the geological structure of the slope belt, reservoir type and distribution characteristics of practical significance.