鄂尔多斯盆地有机包裹体与油气成藏特征研究  

Characteristics of organic inclusions and hydrocarbon accumulation in Ordos Basin

作　　者：李鑫 

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710054

出　　处：《断块油气田》2014年第6期681-685,共5页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目"单个流体包裹体CO2碳同位素显微激光拉曼光谱分析研究"(41173055);国家重点基础研究发展计划("973"计划)项目"高丰度煤层气富集区分布规律与预测评价"(2009CB219602)

摘　　要：鄂尔多斯盆地东南部下古生界奥陶系马家沟组白云岩中识别出2期有机包裹体：早期有机包裹体主要分布在成岩晚期阶段溶蚀孔隙充填的方解石和白云石中,主要为含液态烃的气液两相有机包裹体,液态烃具黄色荧光,包裹体均一温度为130~140℃;晚期有机包裹体主要为含气态烃气液两相有机包裹体,主要分布在晚期构造裂隙充填的方解石脉体中,包裹体均一温度为160~170℃。研究表明,早期有机包裹体记录了含液态烃油气流体形成并开始进入储层的过程,对应的时间为220 Ma（相当于中三叠世）,证明鄂尔多斯盆地东南部天然气经历了液态烃形成阶段。晚期有机包裹体是天然气大规模运移成藏时期形成的,对应的时间为100 Ma（相当于早白垩世末期）。Two-period organic inclusions in Lower Paleozoic Ordovician Majiagou Formation dolomites in southeast of Ordos Basin are identified.The organic inclusions formed in the early period mainly distribute in the calcite and dolomite filling in dissolution pores in the late stage of diagenesis,mainly for the gas-liquid two-phase organic inclusions containing liquid hydrocarbons and the liquid hydrocarbons have yellow fluorescent.The homogenization temperature of organic inclusions is from 130 ℃ to 140 ℃.The organic inclusions formed in the late period mainly distribute in the calcite veins filling in late tectonic fissure,mainly for the gas-liquid two-phase organic inclusions containing gaseous hydrocarbons and the liquid hydrocarbons have yellow fluorescent.The homogenization temperature of organic inclusions is from 160 ℃ to 170 ℃.Research shows that the early organic inclusions record the process of containing liquid hydrocarbon oil flow beginning to entering the reservoir.The corresponding time is about220 Ma（equivalent to Middle Triassic）,showing the natural gas in southeast of Ordos Basin experiences liquid hydrocarbon formation stage.Late organic inclusions are ones formed in large scale oil and gas accumulation period.The corresponding time is about 100 Ma（equivalent to late period of Early Cretaceous）.

关 键 词：有机包裹体 成岩作用 成藏时间 奥陶系 鄂尔多斯盆地 

分 类 号：TE121.1[石油与天然气工程—油气勘探]