高校地质学报Issue(4)：623-634,12.
鄂尔多斯盆地中西部长8砂岩的流体包裹体特征与油气成藏期次分析
Characteristics of Fluid Inclusions and Its Application in Analysis of Hydrocarbon Accumulation Stages from the Chang 8 Sandstone in the Middle West Area of Ordos Basin
摘要
Abstract
The hydrocarbon accumulation stages of the Chang 8 Group, Yangchang Formation, Upper Triassic in the Middle West area of Ordos Basin were studied by analyzing and testing technology of fluid inclusions. The Chang 8 reservoir shows two periods of hydrocarbon-bearing inclusions according to the analysis of the petrography, homogenization temperature, salinity, density and chemical composition of hydrocarbon-bearing inclusions and the associated brine inclusions. The first stage hydrocarbon-bearing inclusions are mainly hosted in the early calcite cement, quartz grain surfaces and their syntaxial quartz overgrowths, and the cracks healed during the early diagenetic phase that do not cut through the quartz grains. The homogenization temperature peak value of brine inclusions associated with hydrocarbon-bearing inclusions of the first stage is mainly 80-90℃. The second stage hydrocarbon-bearing inclusions are mainly distributed in the quartz grain surfaces and the cracks healed in the late diagenetic phase that cut through the quartz grains. The peak value of homogenization temperature dominated the range from 100℃ to 120℃. Evidence from diagenesis and hydrocarbon charging under microscope, diagenesis-hydrocarbon charging evolution sequence study and burial-thermal history analysis show that three periods of hydrocarbon accumulation occurred in the study area. The first hydrocarbon charging stage occurred from 169 Ma to 161 Ma, nearly no hydrocarbon-bearing inclusions suitable for homogenization temperature and chemical component measurement captured in the Chang 8 sandstones due to its limited proportion. Thus inclusions’temperature and composition data of this phase are lacking. The second hydrocarbon accumulation stage with larger dimension and broader distribution occurred during 148-135 Ma, which corresponds to the first stage of the hydrocarbon-bearing inclusions with homogenization temperature and composition measurement data. The third hydrocarbon charging stage occurred in the late Early Cretaceous (125.2-105.7 Ma) and is the major hydrocarbon accumulation stage in the study area which corresponds to the second stage hydrocarbon-bearing inclusions with homogenization temperature and composition measurement data in the Chang 8 sandstones.关键词
流体包裹体/物理性质与化学成分/成藏期次/长8油层组/鄂尔多斯盆地Key words
fluid inclusions/physical property and chemical composition/hydrocarbon accumulation periods/the Chang 8 Group/Ordos Basin分类
能源科技引用本文复制引用
罗春艳,罗静兰,罗晓容,白雪见,雷裕红,程明..鄂尔多斯盆地中西部长8砂岩的流体包裹体特征与油气成藏期次分析[J].高校地质学报,2014,(4):623-634,12.基金项目
国家自然科学基金项目（41272138）；国家重大科技专项（2011ZX05008-004-61；2011ZX05001-002-008）联合资助 （）
