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中文摘要：
流体包裹体在划分油气运移充注期次、确定油气藏形成时间等方面均有重要的应用价值。笔者通过镜下观察流体包裹体的发育产状，划分其类型，描述其特征，并与成岩作用相结合来确定包裹体形成期次。通过对与烃类共生的盐水包裹体进行均一化温度测试，结合其他相关地质资料，认为延长矿区延长组流体包裹体的均一温度集中分布在105—125℃范围内，且包裹体均一温度有随埋深增加而增高趋势。对比研究区埋藏史、地热史分析得出，延长矿区至少存在一期主要的油气成藏期次，发生在距今100～110Ma，即早白垩世晚期，为该区主要的油气成藏期。
英文摘要：
The study of fluid inclusions is very important in detecting the oil migration and accumulation process and the formation time of oil reservoirs. Besides a microscopic analysis of fluid inclusions, the authors divided their types and, in combination with diagenesis and with the help of other useful information, determined the formation stages of fluid inclusions and measured the homogenization temperature so as to analyze the hydrocarbon accumulation history of Yanchang Formation in the Yanchang Oilfield. The result shows that the homogenization temperatures of most fluid inclusions in Yanchang Formation are concentrated in the range of 105 - 125℃, with an increasing trend with the depth. Considering also the burial and geothermal history, the authors consider that there existed at least a main oil and gas reservoir formation period in Yanchang Formation of the Yanchang Oilfield, which took place at 110 - 100 Ma BE This means that the late stage of Early Cretaceous seems to be the main hydrocarbon accumulation period in the Yanchang Oilfield.
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