地球动力学

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS Geodynamics Pub Date : 2022-06-28 DOI:10.23939/jgd2022.02.049
Y. Lazaruk
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引用次数: 1

摘要

本研究的目的是分析该地区的地球动力学对碳酸盐岩下Visean Tournaisian地层油气藏形成的影响。本文的重点是证实第聂伯河-顿涅茨盆地南部地区的Machukhy Tyshchenky地区的碳氢化合物圈闭,以及石油和天然气勘探钻探和刺激天然气流入钻孔的新的有效方法。方法论本研究采用地层、岩性、构造、古构造等方法研究地质和石油潜力,并采用地质类比方法。后果对Machuhy-Tyshchenky地区早Visean Tournaisian时代的含气碳酸盐岩进行了研究。与其他油气区的比较表明,它们是碳酸盐岩平台的圆顶(WаulsoΓtiаn相)。已在该区域内发现三个生物礁石灰岩梯队。这项研究有助于描述石灰岩的形成阶段,并确定石灰岩储层性质对其生物表面类型的依赖性。揭示了构造裂缝在储层岩石形成中的作用。通常,构造裂缝在地层水的作用下由方解石胶结。对致密石灰岩中微裂隙的形成进行了假设。它包括来自地球深处的高能流体的侵入、岩石的自然流体压裂以及在岩石中形成非背斜油气藏。流体突破的可能地点可能是深层断层带:Ingulets-Kryvorizhya-Krupetsk断层带穿过Machuhy-Tyshchenky地区。用碳氢化合物填充微裂缝可防止其胶结。本文给出了钻孔岩芯中微破裂的例子,并根据微破裂层段建立了缩小的岩芯。为了识别碳酸盐岩中的微裂缝层段,建议使用岩心还原和岩石快速钻探的信息。该研究建议使用多级水力压裂和酸性水力压裂,以稳定和增加碳酸盐岩储层向钻孔的气体流入。这种技术应提供钻孔和油饱和储层之间的连接。已经确定了水力压裂过程中可能对环境产生负面影响的因素。独创性除了构造破裂外,致密岩石类型的绝热微破裂在相当深的深度也是可能的。这是由于碳氢化合物气体对沉积地层的天然流体压裂。这为发现与背斜圈闭无关的新型碳氢化合物矿床带来了希望。实际意义。为了在Machuhy-Tyshchenky地区寻找碳氢化合物矿床,建议进行地球物理调查并确定六个钻孔的位置。该研究提出了增加低渗透碳酸盐岩流入钻孔的气体的有效方法。
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GEODYNAMICS
The purpose of the research is to analyze the impact of the region's geodynamics on the formation of hydrocarbon reservoirs in the carbonate Lower Visean-Tournaisian stratum. The paper is focused on the substantiation of hydrocarbon traps within the Machukhy-Tyshchenky area of the southern zone of the Dnieper-Donets basin, as well as oil and gas exploratory drilling and new effective methods of stimulating gas inflows to boreholes. Methodology. The study applies the stratigraphic, lithological, tectonic, paleotectonic methods of studying geology and oil potential, as well as the method of geological analogies. Results. Gas-bearing carbonate rocks of the Early Visean-Tournaisian age in the Machuhy-Tyshchenky area have been studied. A comparison with other oil and gas regions has shown that they are the domes of carbonate platforms (Wаulsoгtiаn facies). Three echelons of bioherm limestones have been identified within the the area. The research helped to describe the stages of their formation and determine the dependence of reservoir properties of limestones on their biofacial types. The role of tectonic fracture in the formation of reservoir rocks is shown. As a rule, tectonic fractures are cemented by calcite under the action of formation waters. An assumption is made about the formation of microfractures in dense limestones due to the action of plumectonic. It consists in the intrusion of high-energy fluids from the depths of the earth, the natural fluid fracturing of rocks and the formation of non-anticlinal hydrocarbon accumulations in them. Probable places of fluid breakthrough may be zones of deep faults: the Ingulets-Kryvorizhzhya-Krupetsk fault zone crosses Machuhy-Tyshchenky area. Filling microfractures with hydrocarbons prevents their cementation. The paper gives examples of microfracturing in the cores of boreholes and establishes reduced core from microfracture intervals. To identify microfracturing intervals in carbonate rocks, it is proposed to use information on the reduction of core, as well as the speed drilling of rocks. The study suggests using multistage hydrofracturing and acid hydrofracturing in order to stabilize and increase gas influxes from carbonate reservoirs to the boreholes. Such technology should provide the connection between the borehole and oil-saturated reservoirs. Probable factors of negative impact on the environment during hydrofracturing have been identified. Originality. Adiabatic microfracturing of dense lithotypes of rocks is possible at considerable depths, in addition to tectonic fracturing. It is due to natural fluid fracturing of sedimentary strata by hydrocarbon gases. This gives hope for the discovery of new types of hydrocarbon deposits that are not associated with anticline traps. Practical significance. Geophysical surveys and the location of six boreholes are recommended in order to search for hydrocarbon deposits in the Machuhy-Tyshchenky area. The study suggests effective methods for increasing gas influxes to boreholes from low-permeability carbonate rocks.
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Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
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33.30%
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GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS
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