流体包裹体中盐度分析与应用——以福山凹陷为例

doi:10.13278/j.cnki.jjuese.20180041

摘要/Abstract

摘要： 盐水包裹体中盐度（w（NaCl））信息与均一温度一样，是进行流体活动分析的主要依据。基于福山凹陷盐水包裹体盐度测试数据并结合均一温度等信息，对福山凹陷流体包裹体的幕次组合及成藏期流体的幕式活动特征进行了分析。结果表明：福山凹陷烃类包裹体荧光色丰富，均一温度单一峰值，盐水包裹体盐度具有先下降后上升再下降的变化特征；其流体包裹体可划分为7个幕次组合，即福山凹陷古近系存在着7幕流体活动，早2幕为排烃早期流体活动，中间3幕为成藏期流体活动，后2幕为异常热流体活动。分析还得出：福山凹陷具有多幕成藏、多源混注的成藏特征，成藏时期为13~6 Ma，油气主充注幕次对应于生排烃高峰；异常热流体活动时期晚于成藏期，且异常热流体活动是导致地层水盐度中途突然升高的主因。

关键词: 流体包裹体, 盐度, 流体包裹体幕次组合, 流体幕式活动, 成藏特征, 福山凹陷

Abstract: Like the homogenization temperature, the salinity of saline inclusions is also an important basis for fluid activity analysis. Based on the test data of fluid inclusions such as salinity and homogenization temperature, the characteristics of episode combinations and episodic activities of reservoir fluid were analyzed in Fushan sag. The results show that the fluorescence color is abundant, the homogenization temperature is of single peak, and the salinity of saline inclusion is characterized by the trend of first falling, then rising and falling again. The fluid inclusions can be divided into seven combinations, corresponding to the seven fluid activities of the Paleogene reservoir forming period:the first two fluid episodic activities were for early hydrocarbon expulsion, the middle three fluid episodic activities were for hydrocarbon accumulation, and the latter two thermal fluid activities were with higher thermal abnormality. According to the comprehensive analyses, characteristics of hydrocarbon reservoir accumulation analyzed about that it include the single stages of petroleum accumulation, and multiple in filling from various source rocks. The analysis result shows that the reservoir in Fushan sag was formed from 13 to 6 Ma in Neogene. The main period of hydrocarbon filling is consistent with the hydrocarbon expulsion peak, and another centralized filling period is consistent with the period of regional tectonic movement. The active period of abnormal thermal fluid is later than the time of hydrocarbon accumulation. It is considered that the abnormal thermal fluid activity is the main reason for the sudden rise of formation water salinity.

Key words: fluid inclusions, salinity, combination of episodes of fluid inclusions, episodic activities of fluid, accumulation characteristics, Fushan sag

中图分类号:

P548

赵迎冬. 流体包裹体中盐度分析与应用——以福山凹陷为例[J]. 吉林大学学报(地球科学版), 2019, 49(5): 1261-1269.

Zhao Yingdong. Salinity Analysis and Application of Fluid Inclusions: A Case Study of Fushan Sag[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1261-1269.

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