GEODYNAMICS

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS
Sviatoslav Iuras, Mykhailo Orlyuk, Serhii Levoniuk, Viktoria Drukarenko, Bohdan Kruhlov
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引用次数: 0

Abstract

Exploration of unconventional gas resources in Ukraine is highly relevant and important for achievement energy independence of Ukraine and Europe. Production of current oil & gas fields and alternative energy resources are not able to cover our needs nowadays. Now we can not fully fill these gaps by energy resources. In this article geological environments, age, mineralogy composition and maturity of unconventional shale and carbonate gas reservoirs of Lower Visean in one of the biggest field of Dnipro-Donets Basin (DDB) were studied. The hydrocarbon potential of two main target horizons V-23 and V-24-25 by using integrated approach of analyzing available core analysis data were performed. The results of the geochemical analysis show that the maturity level of shale of the Rudov beds (V-23) appear in oil window (Ro~0.8%) which can generate oil in the early mature phase. Visean carbonates (V-24-25) have the similar level of maturity - (Ro~0.77%). Target rocks are characterized by high total organic content (TOC): average values vary from 2% for organic-rich carbonates to 5.6% for shales which indicates relatively good to excellent source rock generative potential. According to X-ray diffraction analyses (XRD) of black shale formation domination of silica minerals (54.6%), calcite and clays (25.6%) with minor amounts of albite, feldspar and pyrite were observed. Carbonate platform V-24-25 logically is characterized by much higher calcite content of 52.2 % with low amount of dolomite – 5.5%. Quite high quartz content is also observed – average value is of about 30.7%. Clay minerals are not identified in every sample, but average values are of about 18.9%, pyrite content – 6.8%. It shows that Visean target formation of Glynsko-Solohivsky Petroleum region is characterized by anoxic environment. This data verified that V-23 and V-24-25 horizons are the brittle formations and favorable for multistage fracking. Thin section analysis confirms our results from mineralogical point of view. The presence of fractures in core samples is additional indicator for hydraulic fracturing and producing gas from such unconventional reservoirs. As a conclusion, the Lower Visean organic-rich formations V-23 and V-24-25 from Glynsko-Solohivsky Petroleum region are mature, are characterized by a high content of organic carbon, have enough thickness (30-120 m) and large areal extent. They should be regarded as a potential shale gas target.
运动学
乌克兰非常规天然气资源的勘探对于实现乌克兰和欧洲的能源独立具有高度相关性和重要性。当前石油产量& &;目前,天然气田和替代能源都不能满足我们的需求。现在我们不能完全用能源来填补这些缺口。本文对第聂伯-顿涅茨盆地最大油田之一下Visean地区非常规页岩和碳酸盐岩气藏的地质环境、年龄、矿物组成和成熟度进行了研究。采用综合分析现有岩心分析资料的方法,对V-23和V-24-25两个主要靶层进行了含油气潜力分析。地球化学分析结果表明,鲁多夫层(V-23)页岩成熟度水平处于含油窗(Ro~0.8%),在早期成熟阶段可生油。Visean碳酸盐岩(V-24-25)具有相似的成熟度(Ro~0.77%)。目标岩总有机含量(TOC)较高,平均TOC值从富有机质碳酸盐岩的2%到页岩的5.6%不等,表明烃源岩具有较好的生烃潜力。通过x射线衍射分析(XRD)发现,黑色页岩地层以硅矿物(54.6%)、方解石和粘土(25.6%)为主,钠长石、长石和黄铁矿含量较少。V-24-25碳酸盐岩台地方解石含量高,为52.2%,白云石含量低,为5.5%。石英含量相当高,平均约为30.7%。粘土矿物含量平均值约为18.9%,黄铁矿含量- 6.8%。结果表明,Glynsko-Solohivsky油区Visean靶层具有缺氧环境特征。验证了V-23层和V-24-25层为脆性地层,有利于多级压裂。薄片分析从矿物学角度证实了我们的结果。岩心样品中裂缝的存在是对此类非常规储层进行水力压裂和产气的额外指示。综上所述,Glynsko-Solohivsky油区下Visean富有机质组V-23和V-24-25成熟,有机碳含量高,厚度足够(30 ~ 120 m),面积大。它们应被视为潜在的页岩气开采目标。
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来源期刊
Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
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33.30%
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11
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