关键词: 济阳坳陷, 古近系, 砂岩脉, 成因机制, 油气聚集, 古沉积背景

Abstract: The core observation,thin-section analysis and oil well testing were used to research the types and origins of sand dikes in the Paleogene soft-sediments of Jiyang Depression.The result shows that there are four kinds of sand dikes including throat-like sand dikes,venation-like sand dikes,zonary sand dikes and crack-filling sand dikes.The sand dikes in Jiyang Depression are mainly related to the ancient earthquake.The shaking-fluidization may be the main mechanism to form throat-like sand dikes.The venation-like sand dikes and zonary sand dikes may be related to the shaking-liquefaction-pushing.The crack-filling sand dikes are generated under the shaking-pulling crack-filling actions.The research on sand dikes is favorable for exploration of hydrocarbon reservoirs and for deducing ancient deposition setting and ancient earthquake grade.

Key words: Jiyang Depression, Paleogene, sand dikes, generation mechanism, hydrocarbon accumulation, ancient deposition setting