鄂尔多斯盆地定边地区中生界油藏包裹体特征及地质意义

doi:10.7623/syxb201406006

石油学报 ›› 2014, Vol. 35 ›› Issue (6): 1087-1094.DOI: 10.7623/syxb201406006

鄂尔多斯盆地定边地区中生界油藏包裹体特征及地质意义

时保宏¹, 张艳^2,3, 陈杰^2,3, 张雷^2,3

1. 西安石油大学地球科学与工程学院陕西西安 710065;
2. 中国石油长庆油田公司低渗透油气田勘探开发国家工程实验室陕西西安 710018;
3. 中国石油长庆油田公司勘探开发研究院陕西西安 710021

收稿日期:2014-04-02 修回日期:2014-07-10 出版日期:2014-11-25 发布日期:2014-10-13
通讯作者: 时保宏,男,1970年12月生,1996年获西安地质学院学士学位,2008年获西北大学博士学位,现为西安石油大学地球科学与工程学院副教授,主要从事油气成藏地质学及天然气地球化学方面的研究工作。Email:bh.sh@163.com
作者简介:时保宏,男,1970年12月生,1996年获西安地质学院学士学位,2008年获西北大学博士学位,现为西安石油大学地球科学与工程学院副教授,主要从事油气成藏地质学及天然气地球化学方面的研究工作。Email:bh.sh@163.com
基金资助:
陕西省教育厅项目(11JK0735)资助。

Characteristics and geological significance of fluid inclusions in Mesozoic reservoirs in Dingbian area, Ordos Basin

Shi Baohong¹, Zhang Yan^2,3, Chen Jie^2,3, Zhang Lei^2,3

1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Shaanxi Xi'an 710065, China;
2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China;
3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710021, China

Received:2014-04-02 Revised:2014-07-10 Online:2014-11-25 Published:2014-10-13

摘要/Abstract

摘要：

通过红外光谱、荧光光谱及均一温度等包裹体测试结果,对鄂尔多斯盆地定边地区中生界储层的流体包裹体特征做了系统分析,进而确定该区目的层的成藏期次。研究表明,中生界储层含烃包裹体主要发育液态烃、含气液态烃2类。根据岩相学特征将烃类包裹体分为2期,均一温度峰值区间延安组为60~70℃和90~100℃、延长组为80~90℃和100~120℃,表明研究区主要发生过2期原油运移、充注过程。石油包裹体荧光光谱及红外光谱测试分析结果也表明储层经历了2期不同成熟度烃类充注,早期充注成熟度较低的原油,荧光光谱主峰波长段λ_max为495 nm,荧光颜色为黄绿色、绿色;晚期充注的原油成熟度较高,λ_max为470 nm,烃类包裹体主要发蓝绿色、蓝白色荧光。结合埋藏热演化史确定2期原油充注时间分别对应于侏罗纪晚期—早白垩世早期及早白垩世中晚期。

关键词: 流体包裹体, 均一温度, 红外光谱, 荧光光谱, 充注期次, 定边地区, 鄂尔多斯盆地

Abstract:

The Mesozoic Yan'an and Yanchang formations provide new fields for oil exploration in Dingbian area, Ordos Basin. This paper systematically analyzed the characteristics of inclusions in Mesozoic reservoirs in Dingbian area using the measurements of Fourier transform infrared spectroscopy, fluorescence spectroscopy, and homogenization temperature, further to determine the phases and periods of hydrocarbon migration and accumulation in the target reservoirs. Results show that mainly liquid hydrocarbon and gas-bearing liquid hydrocarbon are accumulated in hydrocarbon-bearing inclusions in the Mesozoic reservoirs. According to their lithological features, the hydrocarbon inclusions can be divided into two phases, respectively corresponding to the peak intervals of homogenization temperature at 60-70℃ and 90-100℃ in the Yan'an Formation, and 80-90℃ and 100-120℃ in the Yanchang Formation. These characteristics are indicative of two major phases of oil migration and accumulation in the study area. Consistently, fluorescence spectroscopy and Fourier transform infrared spectroscopy data indicate that the Mesozoic reservoirs have undergone two phases of hydrocarbon filling with different maturity. Crude oil accumulated in the early phase features a lower maturity with yellow-green and green fluorescence, corresponding to the fluorescence spectrum of 495 nm, while the oil charged in the late phase has a higher maturity with blue-green and blue-white fluorescence, corresponding to the fluorescence spectrum of 470 nm. Combined with the analysis of burial and thermo-evolutionary history of Yan'an and Yanchang formations, the two periods of crude oil filling in Mesozoic reservoirs in Dingbian area were determined, i.e., the Late Jurassic - early stage of Early Cretaceous and the mid-late stage of Early Cretaceous, respectively.

Key words: fluid inclusion, homogenization temperature, infrared spectroscopy, fluorescence spectroscopy, charge phase, Dingbian area, Ordos Basin

中图分类号:

TE112.3

时保宏, 张艳, 陈杰, 张雷. 鄂尔多斯盆地定边地区中生界油藏包裹体特征及地质意义[J]. 石油学报, 2014, 35(6): 1087-1094.

Shi Baohong, Zhang Yan, Chen Jie, Zhang Lei. Characteristics and geological significance of fluid inclusions in Mesozoic reservoirs in Dingbian area, Ordos Basin[J]. ACTA PETROLEI SINICA, 2014, 35(6): 1087-1094.

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鄂尔多斯盆地定边地区中生界油藏包裹体特征及地质意义

Characteristics and geological significance of fluid inclusions in Mesozoic reservoirs in Dingbian area, Ordos Basin

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