含油气盆地油气氧化界面与保存条件纵向分带性讨论——以西藏伦坡拉陆相第三系盆地为例

DISCUSSION ON THE VERTICAL CHARACTERISTICS OF OIL-GAS OXYGENATION LEVEL AND ITS PRESERVATION CONDITION IN PETROLEUM BASIN—A CASE STUDY ON THE CONTINENTAL TERTIARY BASIN IN LUNPOLA, TIBET

付孝悦 卢亚平 肖秋苟

FU Xiao-yue LU Ya-ping XIAO Qiu-gou

中国石油化工股份有限工司, 南方勘探开发分公司, 云南, 昆明, 650200 2. 中国石油化工有限公司, 中南分公司, 湖南, 长沙, 410007

Southern Exploration and Production Branch Company, SINOPEC, Kunming, Yunnan 650200, China 2. Mid-South Branch Company, SINOPEC, Changsha, Hunan 410007, China

该文提出了一个含油气盆地的油气氧化界面及其保存条件的纵向分带性问题.勘探资料表明西藏伦坡拉盆地油气氧化界面为1300m左右.表征该盆地油气氧化界面存在的主要依据是原油物化性质及其化学类型以及氧化沥青出现的最大深度.根据原油物化性质、油气分布及盖层性质随深度的变化,可将伦坡拉盆地油气保存条件在纵向上划分为3个带:小于1000m为氧化带、1000～1300m为过渡带、大于1300m为保存带.

In this article,we discuss the vertical characteristics of oil-gas oxygenation level and its preservation condition in petroleum basin.The exploration data indicate that oil-gas oxygenation level in Lunpola Basin,Tibet is about 1 300m.The main provement of the existence of oil-gas oxygenation level in this basin is the physical and chemical characteristics and chemical type of crude oil,as well as the largest depth of where the oxidized asphalt exists.According to the physical and chemical characteristics of crude oil,oil-gas distribution and the changes of seal characteristics in accordance with its depth,we divide the oil-gas preservation condition in Lunpola Basin into three belts vertically:the oxygenation zone less than (1 000)m,the intermediate zone from 1 000m to 1 300m,and the preservation zone more than 1 300m.

https://doi.org/10.11781/sysydz200306773