Investigation of the transformation of organic matter of carbonate deposits of the Semiluksky–Mendymsky horizon under hydrothermal conditions

IF 4.2 Q2 ENERGY & FUELS
S.M. Petrov , A.I. Lakhova , E.G. Moiseeva , A.G. Safiulina
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引用次数: 0

Abstract

The paper presents the results of studies on the transformation of the organic matter of siliceous-clayey carbonate rocks of the Semiluksko–Mendymsky horizon of the Romashkino oil field in a hydrothermal fluid for an hour (with a water-to-rock ratio of 33) at 340°C and 380°C and pressures of 17 and 20 MPa. As a result of hydrothermal treatment, at 340°C and 17 MPa, based on nitrogen porosimetry and electron microscopy data, transformations of rock-forming minerals in the rock are observed. They lead to an increase in the volume and average diameter of mesopores in it and the formation of micropores, as well, which improve its filtration properties. At the same time, the amount of kerogen in the composition of the organic matter decreases and the yield of the petroleum hydrocarbon extract increases, in which, according to the SARA analysis, the content of asphaltenes increases and the content of resins, aromatic and saturated hydrocarbons decreases. In the composition of aroatic hydrocarbons, the proportion of alkyltrimethylbenzenes and dibenzothiophenes increases, phenanthrene homologues appear, and in the composition of saturated hydrocarbons, the amount of iso-structure alkanes decreases relative to the content of linear alkanes. Raising the temperature and pressure of the hydrothermal fluid to 380°С and 20 MPa increases the degree of kerogen conversion from 12.4% to 23.6%. At the same time, changes occurring in the component composition of petroleum hydrocarbon extracts remains similar to the experiments carried out at 340°C and 17 MPa; the content of naphthalenes decreases, the content of dibenzothiophenes increases and C11–C17, C19–C22 alkyltrimethylbenzenes appear. According to IR spectroscopy, with increasing temperature and pressure of the hydrothermal fluid the intensity of the absorption bands of the aromatic ring, aliphatic fragments, and oxygen-containing groups increases in resins; the structural-group composition of asphaltenes changes little: aromaticity and the content of condensed structures slightly increase. The revealed distinctive features in the composition of organic matter after hydrothermal impact on siliceous-clayey carbonate rocks confirm the concept of staged destruction of kerogen, when large structural heteroatomic blocks (asphaltenes) are split off at the initial stages. Changes occurring in the composition of petroleum hydrocarbon extracts indicate their involvement in the process of hydrothermal transformation of organic matter of siliceous-clayey carmbonate rocks with the predominant reactions of dehydrogenation of naphthenic compounds and oxidative polycondensation of aromatic structures. The data of electron microscopy and nitrogen porosimetry of rocks after hydrothermal exposure at 380°С and 20 MPa indicate a deterioration in their reservoir properties. The most optimal thermobaric conditions of the hydrothermal fluid for the generation of petroleum hydrocarbons from kerogen of siliceous-clayey carbonate deposits of the Semiluksko–Mendymsky horizon of the Romashkino field, which improve their reservoir properties, are 340°С and 17 MPa; with implication of hard-to-recover heavy hydrocarbon resources and well-established catalytic methods of in-situ conversion.

塞米卢克斯基-门迪姆斯基地层碳酸盐沉积有机物在热液条件下的转化研究
本文介绍了罗曼什金诺油田塞米卢克斯科-门迪姆斯基地层硅质粘土质碳酸盐岩有机物在 340°C 和 380°C、17 和 20 兆帕压力下的热液(水岩比为 33)中转化一小时的研究结果。根据氮气孔测定法和电子显微镜数据,在 340°C 和 17 兆帕压力下进行热液处理后,岩石中的成岩矿物发生了转变。这些变化导致中孔的体积和平均直径增大,并形成了微孔,从而改善了岩石的过滤性能。同时,有机物成分中的角质含量减少,石油烃提取物的产量增加,根据 SARA 分析,其中沥青质含量增加,树脂、芳香烃和饱和烃含量减少。在芳香烃的成分中,烷基三甲基苯和二苯并噻吩的比例增加,出现了菲同系物,而在饱和烃的成分中,等结构烷烃的含量相对于线性烷烃的含量有所减少。将热液的温度和压力提高到 380°С 和 20 兆帕,可将角质转化率从 12.4% 提高到 23.6%。同时,石油烃萃取物成分的变化与在 340°C 和 17 兆帕下进行的实验相似;萘的含量减少,二苯并噻吩的含量增加,并出现了 C11-C17、C19-C22 烷基三甲基苯。红外光谱显示,随着热液温度和压力的升高,树脂中芳香环、脂肪族片段和含氧基团的吸收带强度增加;沥青质的结构基团组成变化不大:芳香度和缩合结构的含量略有增加。热液冲击硅质粘土质碳酸盐岩后,有机物组成的显著特点证实了角质层分阶段破坏的概念,即大型结构异原子块(沥青质)在最初阶段被分裂。石油烃萃取物成分的变化表明,它们参与了硅质粘土质碳酸盐岩有机物的热液转化过程,主要反应为环烷化合物的脱氢和芳香结构的氧化缩聚。在 380°С 和 20 兆帕下对岩石进行热液曝晒后,电子显微镜和氮孔测定法的数据表明,岩石的储层特性有所下降。从罗马什基诺油田塞米卢克斯科-门迪姆斯基地层硅质粘土质碳酸盐矿床的角质中生成石油烃的最理想热液热压条件是 340°С 和 17 兆帕;这意味着难以回收的重烃资源和成熟的原地转化催化方法。
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来源期刊
Petroleum
Petroleum Earth and Planetary Sciences-Geology
CiteScore
9.20
自引率
0.00%
发文量
76
审稿时长
124 days
期刊介绍: Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing
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