中国石油大学学报（自然科学版）2025，Vol.49Issue(4)：26-37,12.DOI:10.3969/j.issn.1673-5005.2025.04.003
塔里木盆地轮南地区奥陶系原油性质差异及其控制因素
Control factors of Ordovician crude oil properties and differences in Lunnan area,Tarim Basin
摘要
Abstract
To investigate the control factors and regional differences in the properties of Ordovician crude oil in the Lunnan area of Tarim Basin,a systematic comparative analysis was conducted using oil density,wax content,gas-oil ratio,and the contents of saturated hydrocarbons and aromatics.These parameters were examined in conjunction with the timing of oil and gas charging and the effects of secondary alterations,in order to clarify the spatial variations and controlling mechanisms of crude oil proper-ties between the eastern and western regions.The results indicate that crude oil density in the Lunnan area follows a pattern of being heavier in the east and west and lighter in the middle.In contrast,wax content,gas-oil ratio,saturated hydrocarbon con-tent,and oil maturity parameters exhibit a"lower in the west,higher in the east"distribution.Variations in fault activity dur-ing different tectonic periods have resulted in spatial heterogeneity in multi-phase hydrocarbon charging and secondary modifica-tion,which ultimately control crude oil characteristics.Hydrocarbon charging in the Lunnan area occurred during four major o-rogenic events:the late Caledonian to early Hercynian,late Hercynian,Yanshan,and late Himalayan orogenies.In the Lun-guxi area,primary oil charging occurred mainly during the first two orogenies,with limited evidence of charging during the third.This area is characterized by heavy oil reservoirs due to significant biodegradation.On the central platform,oil charging during the first two orogenies was dominant,with some wells also indicating high-maturity oil and gas input during later oroge-nies.Lower degrees of biodegradation and evaporative fractionation in this region have resulted in predominantly normal oil and condensate gas reservoirs.In the Lungudong area,oil and gas charging occurred during all four orogenies,accompanied by e-vaporative fractionation,leading to the predominance of medium-heavy oil and dry gas reservoirs.关键词
塔里木盆地/轮南地区/原油性质/次生改造Key words
Tarim basin/Lunnan area/oil properties/secondary alteration分类
能源科技引用本文复制引用
罗慎超,秦雪,田金强,李洪,刘鑫,彭鹏,张博,陈元勇,张月,晏楠,丛富云..塔里木盆地轮南地区奥陶系原油性质差异及其控制因素[J].中国石油大学学报（自然科学版）,2025,49(4):26-37,12.基金项目
国家自然科学基金面上项目(42172160) （42172160）
国家自然科学青年科学基金项目(42202142) （42202142）
中国石油大学(华东)深层油气全国重点实验室自主研究课题(SKLDOG2024-ZYRC-07) （华东）
