Ranking the oil contribution of individual layers in a lacustrine shale oil system based on non-hydrocarbon analysis by FT-ICR MS

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Ming Yuan , Caineng Zou , Songqi Pan , Guosheng Zhang , Quan Shi , Lingyuan Xie , Zhengfu Zhao , Yating Shen , Zhenhua Jing
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Abstract

Identifying the dominating oil-producing layer(s) within a shaly system, typically characterized by multiple layers with similar properties, is always a critical yet formidable task, as the oil component disparities among these closely adjacent layers are too minor to be resolved by the traditional geochemical fingerprints. This challenge is now likely addressed by high-resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS), which can resolve thousands of non-hydrocarbons that could serve as new fingerprints. Taking a typical shaly system in the Ordos Basin in China as an example, the specific proportions of non-hydrocarbon compounds from the retained petroleum of different source rock layers (rock extracts) and the produced oil at the wellhead were identified by FT-ICR MS. Their compositional similarity was calculated using a multidimensional scaling (MDS) method, and the layers hosting the retained petroleum with higher compositional similarity to the produced oils are considered to be the main contributors to oil production. The results show that the main producing layers identified by FT-ICR MS differ from those proposed based on traditional fingerprints like the Rock-Eval parameters. A typical example is that the thick low-TOC shales, conventionally proposed to be unessential to oil production, seem to have a similar contribution, if not higher, to their thick silty counterparts. This divergence may be attributed to the fact that the conventional fingerprints primarily rely on the rock extracts from a vertical well section, which may only represent a limited lateral area, while the non-hydrocarbon similarity approach involving the produced oil appears to be more realistic, as it can consider the engineering processes, like the horizontal well track and the hydraulic fracturing effects. The current approach provides a novel route for identifying the dominating producing layer(s) in a shale oil system, which may have extensive potential for optimizing the production strategy of shale oil wells.

基于傅立叶变换-离子色谱质谱法的非烃类分析,对湖相页岩油系统中各油层的含油量进行排序
页岩系统的典型特征是具有类似性质的多层,在该系统中识别主要的产油层始终是一项关键而艰巨的任务,因为这些紧密相邻的层之间的石油成分差异太小,无法通过传统的地球化学指纹来解决。现在,高分辨率傅立叶变换离子回旋共振质谱法(FT-ICR MS)可以解决这一难题,它可以分辨出数以千计的非碳氢化合物,这些非碳氢化合物可以作为新的指纹。以中国鄂尔多斯盆地的一个典型页岩体系为例,利用 FT-ICR 质谱法鉴定了不同源岩层(岩层提取物)的残留石油和井口产出油中非烃化合物的具体比例。使用多维标度(MDS)方法计算了它们的成分相似性,并认为与采出油成分相似性较高的留存石油寄存层是主要的产油层。结果表明,FT-ICR MS 确定的主要产油层与根据传统指纹(如 Rock-Eval 参数)提出的产油层不同。一个典型的例子是,厚的低 TOC 页岩通常被认为对石油生产没有必要,但其贡献似乎与厚的淤泥质页岩相似,甚至更高。出现这种分歧的原因可能是,传统的指纹识别主要依赖于从垂直井段提取的岩石,而垂直井段可能只代表有限的横向区域,而涉及产油的非碳氢化合物相似性方法似乎更加现实,因为它可以考虑工程过程,如水平井轨迹和水力压裂效应。目前的方法为确定页岩油系统中的主要产油层提供了一条新途径,可能对优化页岩油井的生产策略具有广泛的潜力。
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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