CHARACTERISTICS OF FLUID INCLUSIONS AND HYDROCARBON ACCUMULATION PHASES OF THE MESOZOIC IN THE JIYUAN SAG
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摘要:
济源凹陷是以华北古生界地台为基底，经过复杂构造演化形成的中—新生代叠合盆地。其成藏体系复杂，可能经历多期油气充注、破坏及改造，而中生界油气成藏时期尚未盖棺定论。储层中流体包裹体保留了许多重要信息，如温度、压力、流体成分、古环境特征等，在鉴别烃源岩热演化阶段和油气的生成、油气充注期次的划分、流体古压力恢复、油气成藏过程剖析中发挥重要作用。为了解济源凹陷中生界油气成藏时期，在下侏罗统鞍腰组和上三叠统谭庄组两套主要烃源岩的热演化研究基础之上，运用流体包裹体系统分析方法以及均一温度-埋藏史间接投影定年法，分析了济源凹陷中生界流体包裹体特征，进而对油气成藏期次进行划分。研究结果表明：济源凹陷中生界储层捕获了7种赋存状态的烃类包裹体，包括蓝绿色、黄绿色和蓝色3种不同荧光颜色的油包裹体以及纯气相包裹体; 根据包裹体颜色、均一温度测定及宿主矿物产状、成岩次序等特征，认为至少发生过3期油充注(163 Ma、101~95 Ma和27~23.8 Ma)和1期天然气充注(119~115 Ma)。
Abstract:The Jiyuan Sag is a Mesozoic-Cenozoic superimposed basin, formed on the basis of the Paleozoic platform of North China by complex tectonic movement. The sag is characterized by complicated hydrocarbon accumulation systems, after multi-stages of charging, destruction and transformation of hydrocarbons. So far the Mesozoic hydrocarbon accumulation phases in the sag have still remained unclear. Fluid reservoir inclusions, as an effective tool, may provide various information related to hydrocarbon accumulation, such as temperature, pressure, fluid composition and paleoenvironmental characteristics, etc., and are commonly used for definition of thermal evolution stages of source rocks and division of hydrocarbon generation and charging stages, the restoration of fluid paleopressure, as well as the analysis of hydrocarbon accumulation process. In this paper, fluid inclusions are used to study the hydrocarbon accumulation phases for the thermal evolution of the two set of major source rocks, the Lower Jurassic Anyao Formation and the Upper Triassic Tanzhuang Formation, in the sag.Systematic analysis method and the indirect projection dating method for homogenization temperature-burial history were used to analyze the characteristics of fluid inclusions for dividing the hydrocarbon accumulation phases.The results suggest that there are 7 kinds of hydrocarbon inclusions in the Mesozoic reservoirs of the Jiyuan Sag, including oil inclusions with three kinds of fluorescence colors in blue-green, yellow-green and blue respectively, and pure gas-phase inclusions; According to the fluorescence color and homogenization temperature of inclusions, host mineral occurrence and its diagenetic sequence in addition to other characteristics, it is considered that at least 3 phases of oil charging (163 Ma, 101~95 Ma and 27~23.8 Ma) and 1-period of gas charging (119~115 Ma) have occurred in the sag.
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Key words:
- fluid inclusion /
- homogenization temperature /
- hydrocarbon accumulation phases /
- Mesozoic /
- Jiyuan Sag
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表 1 利用与油包裹体同期盐水包裹体均一温度确定油气充注时间表
Table 1. Infilling time determined by oil inclusion and aqueous fluid inclusions
井号(剖面) 层位 油包裹体平均均一温度/℃ 同期盐水/含烃盐水包裹体平均均一温度/℃ 时间/Ma 源1井 T2y 83.8 103.0
128.8
169.5101~95 源1井 P2ss 126.9/92.0
150.8/122.1119~118
117~115邓2井 E2z 129.9 131.3
148.924.5~23.8 承留镇剖面 J2m 61.6
132.0
154.9100.9
135.3
149.5100
25承留镇剖面 J1a 84.5
127.997.8
120.3
146.098~96
28~25承留镇剖面 T3t 65.4
87.1
104.581.7
101.3
122.0
150.5163
101~95
27~26
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