关键词: 济阳坳陷, 透镜体油藏, 地质门限, 成藏机理

Abstract: Sand lens reservoir was formed on premise of being up to hydrocarbon supply thresholds and hydrocarbon accumulation thresholds.The hydrocarbon supply threshold is corresponding to the critical geologic conditions for expulsion hydrocarbon of source rock to sand body.There have been proven 112 reservoirs with the buried depth greater than 2500m among 114 main sand lens reservoirs in the Jiyang Depression.The accumulation hydrocarbon threshold is the critical geologic condition,on which sand lens accepted hydrocarbon from source rock,corresponding to the porosity of 12 percent as well as the permeability of 0.001μm² in the Jiyang Depression.The porosity and permeability of more than 98 percent of reservoirs got up to or exceeded the critical value among the main proven sand lens reservoirs.Generally, there were four stages for sand lens to go through during the burial process.The sand lens to accumulation in the third stage was the most profitable to meet both hydrocarbon supply conditions of source rock and its own hydrocarbon accumulation conditions.

Key words: Jiyang Depression, sand lens reservoir, geological threshold, accumulation mechanism