胜利油气区有机包裹体研究及其在油气勘探中的应用

STADY ON ORGANIC INCLUSIONS IN SHENGLI OILGAS PROVINCE AND THEIR APPLICATION IN THE PETROLEUM EXPLORATION

应用显微光度术、显微傅立叶红外光谱（Ｍｉｃｒｏ－ＦＴ．ＩＲ）和飞行时间二次离子质谱（ＴＯＦ－ＳＩＭＳ）等原位微分析技术并结合均一温度测量对胜利油气区下第三系沙河街组沙三段中有机包裹体进行了研究。区分出两类有机包裹体，即原生有机包裹体和次生有机包裹体。结果表明两类有机包裹体特征不同，二者物质组成、有机质成分及化学结构、热演化程度等差别也较大。结合地质分析表明原生有机包裹体是沙三段烃源岩生成烃类运移产物，具“自生自储”特点，而次生有机包裹体是沙四段烃源岩生成的烃类二次运移的产物。沙三段是沙河街组油气运移和聚集的主要层位，因而是寻找油气资源的主要目标层。研究表明，有机包裹体是研究油气生成、运移、聚集和演化等成藏系统最有效的手段之一，在油气勘探中有重要的应用意义。

Organic inclusions from Sha Hejie Formation of Eogene Period in Shengli Oil Gas Province,EastChina,were studied using Micro-FT fIR and fluorescence microscopy as well as the TOF-SIMS together withthe measurement of homogenization temperature (HT). Two populations of organic inclusions were recognized,that is the primary and secondary organic inclusons. The primary organic inclusions contained sulfur alcohols and longer alkyl chains with the carbon atom number of 15~17 compared with the secondary organicinclusions which contained shorter alkyl chains with the carbon atom number of only 5~ 6 and a certainamount of H2S besides sulfur alcohols. The primary organic inclusions experienced a lower degree of thermalevolution with the HT of 87~91℃ than that of the secondary organic inclusions with the HT of 98~ 105 ℃,which is consistent with the characteristics of the fluorescence spectroscopy and parameters (λmax,Q values)ofthe organic inclusions. The composition and thermal maturation of organic inclusions show that the primaryorganic inclusions formed during the period of hydrocarbon generated and migrated inside of the stratumwhere they lived while the secondary organic inclusions are trapped when the hydrocarbon migrated secondlyfrom the source rocks under the stratum to the place where they accumulated.