标题:
邦戈尔盆地北部斜坡油气成藏期次研究Oil and Gas Accumulation Period on the Northern Slope of Bongor Basin
作者:
曾艳涛, 文志刚, 宋换新
关键字:
邦戈尔盆地, 北部斜坡, 成藏期, 地球化学, 包裹体;Bongor Basin, Northern Slope, Oil and Gas Accumulation Period, Organic Geochemistry, Inclusion
期刊名称:
《Journal of Oil and Gas Technology》, Vol.38 No.1, 2016-03-14
摘要:
利用原油物性、色谱–质谱及包裹体等资料，通过地球化学、流体包裹体等方法，结合主生烃期和圈闭形成，对乍得邦戈尔盆地北部斜坡油藏成藏期次及时间进行了分析。结果显示，原油样品中具有正构烷烃系列与25-降藿烷系列同时并存及正常原油与降解原油的倒置分布等特征，表明研究区油气经历多期次的成藏。包裹体镜下鉴定可见烃类包裹体和盐水溶液包裹体特征整体相似，表明原油组分及成熟度相近。成藏综合分析表明，邦戈尔盆地北部斜坡存在一个主要的成藏期为晚白垩世早期，而晚白垩世晚期和古近纪晚期的2次构造反转运动期为研究区2个重要的油气成藏调整期。
Based on the analysis data of physical properties of crude oil, GC-MS, fluid inclusion and so on, by using the organic geochemistry method, fluid inclusion analysis method, combined with the main hydrocarbon generation period method and trap forming method, the period of the oil and gas accumulation on the northern slope of Bongor Basin was researched. The results show that there are probably more periods of oil and gas accumulation in the study area according to the characteristics of the coexistence of n-alkanes series and 25-norhopance series, the inversion distribution of normal oils and degraded oils, and so on. The result of microscopic identification of the fluid inclusion indicates that the characteristics of hydrocarbon inclusions and saline inclusions are similar. Comprehensive analysis of the oil and gas accumulation shows that the early period of late Cretaceous is the main period of oil and gas accumulation on the northern slope of Bongor Basin, while the late period of late Cretaceous and late Paleogene are the 2 important adjustment periods of hydrocarbon accumulation in the 2 times of tectonic inversion movement.