渤海湾盆地渤南洼陷沙四段油气多期充注的流体包裹体证据

doi:10.11743/ogg20170201

摘要/Abstract

摘要： 为了确定渤海湾盆地渤南洼陷沙河街组四段的油气充注历史，对该层段24口井26块样品进行了流体包裹体系统分析，包括显微鉴定、微束荧光光谱分析和均一温度测定，并结合取样井沉积埋藏史及热演化史分析，明确了油气充注幕次和时间。流体包裹体分析发现，该层段主要发育盐水、油和含烃盐水3类包裹体，并见沥青包裹体及裂缝/孔隙充填沥青。油包裹体以发黄-黄绿色和蓝白色荧光为主，少量发橙色荧光；橙、黄-黄绿和蓝白色荧光光谱主峰波长λ_max分别为555.76~576.88，513.25~555.76和491.13~497.93 nm。红绿熵Q_650/500分布在0.21~0.39，0.43~0.96和0.95~1.17，Q_{t 535}值分布在2.25~2.71，0.99~2.45和0.60~1.13，它们伴生的盐水包裹体均一温度分别为92.6~112.2，106.4~143.7（120~140为主）和143.2~162.7 ℃。由此推测，渤南洼陷沙四段至少发生过早、中、晚3期油气充注过程。通过盐水包裹体均一温度在沉积埋藏史和热史图上的投影，得到3期油气充注时间分别为30.7~27.7，18~5和3.8~0 Ma。目前发现的油气主要是第二和第三期充注的结果。

关键词: 微束荧光光谱, 均一温度, 流体包裹体, 油气多期充注, 沙河街组四段, 渤南洼陷, 渤海湾盆地

Abstract: To confirm oil charge stages in the Bonan Subsag,Bohai Bay Basin,Twenty six samples collected from twenty four wells in Shahejie member 4(Es⁴) were used for fluid inclusion analysis.Based on microscopic identification,micro-beam fluorescence spectra and homogenization temperature testing in combination with sedimentary burial and thermal evolution histories,oil charge stages and their timings were obtained.There mainly developed three types of inclusions in the Es⁴ reservoirs including aqueous inclusions,oil inclusions and hydrocarbon brine inclusions.In addition,asphalt inclusion and filling asphalt in cracks and pores were also observed in some samples.Fluorescence colors of oil inclusions mainly are yellow-yellowgreen and blue-white,with a little of orange color.Main peak wavelength (λ_max) distribution of orange,yellow-yellowgreen and blue-white oil inclusions are 555.76-576.88,513.25-555.76,and 491.13-497.93 nanometers respectively.Red-green entropy Q_650/500 and Q_{t 535} of the three colors oil inclusions are 0.21-0.39 and 2.25-2.71,0.43-0.96 and 0.99-2.45,and 0.95-1.17 and 0.60-1.13 respectively.Homogenization temperatures of coeval aqueous inclusions of the three colors oil inclusion are 92.6-112.2,106.4-143.7(mainly 120-140) and 143.2-162.7 degree centigrade.Conclusion could be drawn that reservoirs in the Es⁴ had experienced at least three oil charging stages(early,middle and later stages)with different maturity of the oils.By positioning the aqueous inclusions homogenization temperature values on sedimentary burial and thermal evolution history chart,the geological times of the three oil charging stages are obtained which are 30.7-27.7,18-5 and 3.8-0 million years respectively.Current oil and gas found in the Es⁴ were mainly accumulated during the second and the third charging stages.

Key words: micro-beam fluorescence spectrum, homogenization temperature, fluid inclusion, multi-stage charging of oil and gas, Shahejie member 4, Bonan Subsag, Bohai Bay Basin

中图分类号:

TE122.1

林红梅,程付启,王永诗,等. 渤海湾盆地渤南洼陷沙四段油气多期充注的流体包裹体证据[J]. 石油与天然气地质, 2017, 38(2): 209-218. doi: 10.11743/ogg20170201 Lin Hongmei,Cheng Fuqi,Wang Yongshi,et al. Fluid inclusion evidence for multi-period oil charge in Shahejie Member 4, Bonan Subsag,Bohai Bay Basin[J]. Oil & Gas Geology, 2017, 38(2): 209-218. doi: 10.11743/ogg20170201

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