大庆石油地质与开发

2015, v.34;No.171(05) 32-37

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柴达木盆地南翼山油田新近系油藏包裹体与成藏特征
INCLUSIONS AND REESERVOIR-FORMING CHARACTERISTICS OF THE NEOGENE RESERVOIRS IN NANYISHAN OILFIELD OF QAIDAM BASIN

张君峰,喻廷旭,许浩,房媛,汪雷,祝武权
ZHANG Junfeng,YU Tingxu,XU Hao,FANG Yuan,WANG Lei,ZHU Wuquan

摘要(Abstract):

基于流体包裹体测试,结合盆地埋藏史分析,对柴达木盆地南翼山油田新近系油藏成藏特征进行了剖析。研究表明南翼山油田新近系上油砂山组颗粒灰岩储层中包含液态烃、气液烃、气态烃及盐水等4种包裹体类型,主要分布于切穿灰岩颗粒的微裂隙、灰岩缝洞方解石充填物及粒问亮晶方解石胶结物中,烃类普遍发较强的蓝色和浅蓝色荧光,其中掺杂显示较强黄绿色荧光斑点。研究还表明上油砂山组储层中存在2期包裹体,第1期包裹体形成于上新世中期,此时上干柴沟组烃源岩进入低成熟阶段,伴随中喜马拉雅期构造运动,油气沿断层向上运移成藏,该期油气充注量较小,主要为少量低成熟的液态烃;第2期包裹体形成于上新世晚期,该时期圈闭定型、烃源岩成熟和断层、裂缝运移通道条件等匹配最好,是油藏中烃类注入的关键时期。
Based on the fluid inclusion test,combined with the analysis of the burial history,the Neogene reservoir accumulation characteristics of Nanyishan Oilfield in Qaidam Basin are analyzed.The researches show that four types of the fluid inclusions occur in Neogene Upper Youshashan-Formation grain limestone reservoirs of Nanyishan Oilfield,including liquid hydrocarbon,liquid-gas hydrocarbon and gas hydrocarbon and brine.They are mainly trapped in the micro-fractures of the limestone,calcite filling mass in the limestone holes and intergranular sparry calcite cement,the hydrocarbon commonly shows strong blue and light blue fluorescence,in which doped some strong yellow-green fluorescence spots.The study still proves that there are two periods of inclusions in the above reservoirs:one was formed in the medium of the Upper Pliocene,at this time,the hydrocarbon source rocks in the upper Gancaigou Formation had entered into the stage of low maturity accompanying with middle Himalayan orogeny,the oil and gas migrated upward along the faults and accumulated into reservoirs,but the filled hydrocarbon at this time was rather less,including small amount of low-maturity liquid hydrocarbon;the other inclusions were generated at the late period of the Upper Pliocene,the traps were formed completely,the hydrocarbon was matured,the optimal matching relationship among the faults,channel conditions of the fracture Tirigration were realized,so it was the key period of the hydrocarbon(oil) accumulating and filling into the reservoirs.

关键词(KeyWords): 柴达木盆地;南翼山油田;新近系;包裹体;成藏特征;油气充注
Qaidam Basin;Nanyishan Oilfield;Neogene;inclusion;reservoir-accumulating/forming characteristic;hydrocarbon filling

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“三塘湖盆地侏罗系低压油藏形成机制研究”(40802027)

作者(Author): 张君峰,喻廷旭,许浩,房媛,汪雷,祝武权
ZHANG Junfeng,YU Tingxu,XU Hao,FANG Yuan,WANG Lei,ZHU Wuquan

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