Geochemical Characteristics and Gas Source Comparison Analysis of Fault Adjusted Tight Gas Reservoirs

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS
Chang Liu, Shulan Zhuang, Qingfa Liu
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Abstract

Tight gas is an extremely important unconventional oil and gas resource, and its efficient development can effectively alleviate the current tense energy situation. However, the geochemical characteristics and gas source analysis of fault adjusted tight gas reservoirs are currently insufficient. Therefore, based on experimental methods such as tight gas composition and hydrocarbon isotope determination, the geochemical characteristics of typical tight gas reservoirs were analyzed, and discussions were conducted on the genesis of tight gas and source rock properties in the study area. The research results found that the tight gas in the study area is mainly composed of light hydrocarbons, and the tight gas reservoir is an ideal geological body for carbon dioxide geological storage, with an estimated CO2 burial value of up to 3.43·109 tons. Meanwhile, high-temperature and high-pressure trapping environments can easily cause heavy hydrocarbons in the trap to break down into light hydrocarbons, resulting in a much higher δ13-C1 value in the carbon isotopes of tight gas compared to other carbon isotopes. The light hydrocarbon components of typical tight gas reservoirs are mainly oil associated gas types, while the heavy hydrocarbon components are mainly coal derived gas types. Moreover, the average organic carbon content in the tight gas in the study area is 6.67%, indicating that its source rocks are type I and II-1 kerogen, derived from underlying humic source rocks. Finally, the study found that the δ13-CO2 values of all dense gas samples ranged from 7.85% to 15.3%, and the carbon dioxide concentration was all below 6%, indicating that the source of carbon dioxide in dense gas is a mixed mode.

Abstract Image

断层调整致密气藏的地球化学特征和气源对比分析
致密气是一种极其重要的非常规油气资源,有效开发致密气可以有效缓解当前紧张的能源形势。然而,目前对断层调整致密气藏的地球化学特征和气源分析还不够充分。因此,基于致密气成分和烃同位素测定等实验方法,分析了典型致密气藏的地球化学特征,并对研究区致密气成因和气源岩性质进行了探讨。研究结果发现,研究区致密气主要由轻烃组成,致密气藏是二氧化碳地质封存的理想地质体,预计二氧化碳埋藏量可达 3.43-109 吨。同时,高温高压的捕集环境容易使捕集层中的重烃分解为轻烃,导致致密气碳同位素中的δ13-C1 值远高于其他碳同位素。典型致密气藏的轻烃组分主要是石油伴生气类型,而重烃组分主要是煤衍生气类型。此外,研究区域致密气中的平均有机碳含量为 6.67%,表明其源岩为Ⅰ型和Ⅱ-1 型角砾岩,来源于下伏腐殖质源岩。最后,研究发现所有致密气样品的δ13-CO2 值介于 7.85% 至 15.3% 之间,二氧化碳浓度均低于 6%,表明致密气中二氧化碳的来源为混合模式。
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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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