Abstract As an intuitive way, the method of limestone tablets (MLT) is often used in dissolution rate calculation and carbon cycle research of carbonate rocks. To clarify the influential factors and spatial suitability of MLT in karst carbon cycle study, 30 MLT test sites in China from north to south were collected and the tablets’ dissolution rate (TDR) was analyzed. The results showed that the influence

It is becoming widely recognized that a relationship exists between stress, stress heterogeneity, and the permeability of subsurface fractures and faults. We present an analysis of the Shunbei oil gas field, developed mainly in fractured carbonate, where active deformation has partitioned the reservoir into distinct structural and stress domains. These domains have differing geomechanical and structural

Bicarbonate (HCO3−) is one of the dominant carbon forms in the aquatic ecosystem and carbon cycle in karst areas. Recent studies have focused on the HCO3− utilization by aquatic plants to assess karst carbon sink at a watershed scale. However, the predominated researches inadequately address the effects on growth of submerged plants in various HCO3− conditions and how the submerged plants affect the

The nature of the Cretaceous–Paleogene (K/Pg) boundary in the Kurdistan region of northeastern Iraq is still under debate. Most studies have considered the Danian sediments to be mostly missing. Another hypothesis suggests that a conglomerate represents the contact between the Cretaceous and Paleogene. We examined the succession of the Deramazan and Chinarok sections in Sulaimani area to examine calcareous

Mine water damage is one of the main disasters threatening mine safety during production. The key to mine water hazard prevention and control is determining the main aquifer characteristics that threaten the mine and the hydraulic connections between aquifers and water diversion channels and proposing appropriate preventive measures. This paper focuses on the 16104 working face of the lower coal group

The technique of karst susceptibility assessment in the territory of Ust-Kishert village is presented. The environmental conditions of predominantly gypsum and carbonate–gypsum karst area are analyzed. The zonation map of karst cavities and crushed zones density is created. The distribution of the overlying soil geotechnical property values within the classes of different subterranean karst form density

The mining of deep coal seams in the North China coalfields is threatened by the risk of water inrush from the Ordovician karst. As the mining depth increases, traditional methods of drainage depressurization and grouting reinforcement of the coal floor are increasingly ineffective at solving the problem of water inrush from the Ordovician karst. Grouting reinforcement of the Fengfeng Formation in

The Lower Ordovician succession, consisting of the Yingshan and Penglaiba formations, encompasses significant petroleum reservoirs in Yubei area, southwest Tarim Basin. Mesogenetic dissolution and dolomitization strongly contributed to the increase in rock porosities here. Wells YB 7, YB 5, and YB 1-2X drilled in eastern Yubei area met the deposits of Yingshan and Penglaiba formations, providing abundant

Calcite dissolution, porosity development are strongly influenced by mixing phenomenon, fluid density and heterogeneity (variability of the hydraulic proprieties). This study presents an approach for calculating porosity change in a heterogeneous porous media during mixing of seawater and freshwater. The proposed approach is based on the Phillip’s analytical solution and is determined by five main

This study investigates the depositional setting and diagenetic processes of gypsiferous sediments known as the Koluz gypsum member located in the northeast of Van (Eastern Anatolia-Turkey). The commencement of still-active contractional regime due to the collision of Eurasian and Arabian plates gave way to uplift events on the active Eurasian margin. This uplift initially resulted in termination of

The Ordovician carbonate shoals are extensively developed in the Tarim Basin, NW China, and are taken as important petroleum reservoirs. The sedimentary characteristics and controlling factors of these shoals are poorly studied. Multiple means, including field geological investigations, core observations, thin section identifications by scanning electron microscope and cathodoluminescence microscope

The mining of stratigraphically low coal seams in North China-type coalfields is subject to water inrush from the underlying Ordovician limestone aquifer. The water-inrush coefficient method that is currently used for the evaluation of the water-inrush risk has inherent shortcomings, because it takes into account only the aquifer head pressure and the aquiclude thickness. Therefore, an improved water-inrush

Two sets of thick salt have developed in the Kuqa foreland basin, which has a great influence on the evolution of subsalt reservoirs. The abnormal favorable reservoirs, developed at a depth of approximately 4000–5500 ms, was several hundred meters from the bottom of the salt body based on the drilling data. The study was carried out to understand the formation of the favorable subsalt reservoirs based

Pore-cave systems formed by karstification in the eogenetic stage of carbonate rocks provide abundant potential reservoir space for hydrocarbons. However, whether these dissolution pore-caves can become effective reservoir spaces during the later burial period, serving as the key to the success of hydrocarbon exploration. Therefore, it is important to explore the fluid activities and their alteration

Integration of the information from hydrochemical data, statistical analysis and modeling technique is crucial for extending our knowledge of hydrochemistry of karst aquifers. In this paper, conventional graphical methods, statistical analysis and PHREEQC inverse modeling were used to investigate the hydrogeochemical characteristics and evolution processes of karst groundwater in Jinci spring area

Preliminary hydrogeological and geochemical observation were conducted in the Phong Nha—Ke Bang National Park and Tu Lan Karst Area, Quang Binh Province, Vietnam to evaluate and document the hydrogeologic conditions, karst surface features, water geochemistry and limestone composition. The study area provides an excellent benchmark for karst hydrogeological investigations in central Vietnam. The data

Albania is situated in the western part of Balkan Peninsula, on the eastern coast of the Adriatic and the Ionian Sea, which is one of the most water−rich regions of the world. The karst landscape in Albania covers about 2750 km2 consisting of nearly 24% of the countries territory. Karstic aquifers are the richest in the country. The total renewable karst water resources represent about 80% of the groundwater

The upper member of the Xiaganchaigou Formation in the Yingxi Area of the Southwestern Qaidam Basin is a set of evaporite-bearing lacustrine series. In this study, petrographic analyses of rock thin sections, cores, drillings, logging as well as geochemistry were used to study the characteristics of the sedimentary cycles of the series. Concurrently, this study adopts a transgressive–regressive (T–R)

The role of microfacies and diagenesis was focused to assess the hydrocarbon potential of Eocene carbonate strata exposed in Sulaiman–Hazara mountain ranges. Thin- to thick-bedded Eocene limestone exhibits wackestone, packstone, mudstone, and grainstone texture and comprises larger benthic forams such as Nummulite, Assilina, Lockhartia, Discocyclina, Orbitolites and Operculina. The accumulation of

Reservoir characterization of petroleum reservoirs can be claimed as one of the most important parts of reservoir management for optimized production and future developments. Through reservoir evaluation, geological zoning for a better comprehension of subsurface structure is needed. For developing a model, porosity plays a vital role; there are two common methods for obtaining this parameter, core

The Sichuan Basin contains the most prolific marine potash salt deposits in China. Although a vast amount of polyhalite has been found in the Triassic Jialingjiang Formation, the production of soluble potash deposits has yet to begin. The origin and sedimentary environment of polyhalite has remained unclear, and this information could have a significant economic impact. The recent discovery of protogenetic

Segregation of sediments for oil and gas potential is a complex task. In this study three oil wells i.e. Dhurnal, Pariwali and Pindori were analyzed for oil and gas potential using geophysical well logs and isotopic analysis. 50 sediments (Eocene to Early Permian) from three productive oil wells were analyzed for source and depositional environment. The Eocene Chorgali limestone and Eocene Sakesar

Static reservoir modeling for optimizing the strategies of hydrocarbon field developments using seismic data and well logs is the focus of this study. The static reservoir modeling is conducted to estimate reservoir properties of the Upper Sarvak formation in one of the offshore oil fields in the Persian Gulf. The Sarvak Formation with middle Cretaceous age is considered as one of the most important

The predominantly calcareous Taiyuan Formation was formed during the Late Paleozoic period in the southern part of the North China block in the eastern Palaeotethys. We present the rare earth elements (REE) and petrography data from nine limestone beds in the Zhangji mine of the Huainan coalfield as proxies to interpret the depositional environment of Taiyuan Formation. Thin-section petrography indicates

Karst-related issues have become serious in the Three Gorges reservoir area, where the bank slopes consist of marlite. In this paper, the mineralogical and petrological properties and internal micro-structure development mechanism of the marlite were analyzed to determine its dissolution and weathering characteristics. In addition, the application of high-power electron microscopy identified micro-cracks

This work is meant to study the formation of salt through a progressive evaporation of water of sebkha Mchiguig. The precipitated salt in the case of sebkha Mchiguig is variable along the progressive evaporation. Weights of salt before each phase of precipitation indicate a heterogeneous evaporation process cumulating at 394 g L−1. With an increasing evaporation of Mchiguig brine, the number of precipitated

Based on their facies characteristics and stratal geometries, the carbonate deposits of the Middle Eocene outcropping in the Tamerza area (Western Gafsa Basin) led to the recognition of nine facies that were deposited in shallow marine environment summarized in a carbonate ramp model: homoclinal ramp under an arid climate. The depiction of facies features and the sequential analysis help to determine

The genesis of dolomite is an intensively debated and extensively studied problem in the field of carbonate sedimentology. This study focuses on the dolomite of the Dapu Formation in the Guixinan area, with the aim of deciphering the mechanism of dolomitization in the Dapu Formation. Three types of sedimentary environment, including the open marine of inner ramp, the restricted marine of inner ramp

The main aim of this study is to determine the location of the cave and cavities in Zarrinabad area, Lorestan province, west of Iran. For this purpose, a combination of hybrid AHP-TOPSIS procedure and content-area (C-A) fractal method has been conducted on three types of geoelectrical data derived from electrical resistivity, self-potential and mise-a-la-masse methods to detect karstic zones and determining

In the Shahejie Formation in the D oilfield area of the Laizhouwan Sag, Bohai Bay Basin, a mixed sedimentary structure of terrigenous clastic and carbonate rocks has developed. Scholars at home and abroad have performed much research on clastic and carbonate lithology identification. However, studies on lithology identification and reservoir characteristics of mixed siliciclastic-carbonate rocks in

The distribution area of carbonate rocks in Beijing is about 5071.44 km2, accounting for 30.19% of the land area in Beijing. The distribution areas of bare, covered and buried carbonate rocks are 2862.21 km2, 401.86 km2, 1803.37 km2, respectively. The carbonate rocks mainly includes dolomite in Changcheng Group of Jixian System (Jxg), dolomite in Wumishan Group of Jixian System (Jxw), dolomite in Tieling

Snowfall is the dominant form of precipitation in high mountainous areas and its driving melt water has an indispensable role in the hydrological cycle and groundwater recharge, particularly in karstic landscapes with high infiltration capacity. Monitoring snow cover area (SCA) and its melting process is essential for the investigation of climatic variables, hydrology, hydrogeology, and water resource

The Es1 sandstone is a fruitful hydrocarbon zone of Eocene Shahejie Formation. Therefore, the present study comprises the subsurface facies analysis established on the description of seven wells. Methods include core observation, thin section petrography, scanning electron microscope (SEM), cathodoluminescence (CL), and X-ray diffraction to evaluate the microfacies, lithofacies, and rock characteristics

Mixed sediments often occur in continental lake basins due to the coupling effects of the climate, hydrodynamic conditions, tectonic processes, and material abundances of provenances, and the mixed sedimentary rock formed in this process has dual characteristics. The response of mixed sedimentary rock to seismic waves is different from that of conventional sandstones or carbonate rocks and easily causes

Pliocene glaciations, post-glacial Tyrrell Sea deposition, peatland formation, and continuous isostatic uplift have created a unique environment for karst development on the Paleozoic carbonate rocks within the James Bay Lowland of Canada. Four types of sinkhole and two karst hydrogeological systems have been recognized in the study area. The hydrogeologically active karst system consists of solution

Investigating the diffusion law of slurry while grouting in fractured aquifer is of great significance to the safety in coal mining. In this paper, we comprehensively studied the slurry diffusion in the fractured aquifer, which was grouted through horizontal injection holes. A theoretical model of slurry diffusion in the inclined tubular fractures, as well as the relationship between the distance of

Water-inrush accidents often occur when coal seams are mined with thin water-resisting layer and high confined water. To prevent water-inrush from coal seam floor, based on the analysis of the characteristics of Ordovician limestone (OLS) karst in Feicheng mining area, a series of key technologies or methods for OLS aquifer were studied in this paper. First, the grouting area of the working face floor

The Dawu water source is the most important urban water supply source in Zibo City, Shandong Province, China. In this paper, the karst water level, precipitation, exploitation and flood discharge data during 2012–2018 were used to study and explore the characteristics and factors that control and influence the dynamic evolution of the karst water level in the Dawu water source area. The results showed

Magnesium calcite, which is usually observed in many natural low-temperature environments, was identified in Triassic limestones of the Polish part of the Germanic Basin. The occurrence of unstable magnesium calcite in Triassic limestones is remarkable. High-Mg calcite was identified in all beds of the Muschelkalk Karchowice Formation: Lower Crinoidea Beds, Lower Biohermal Beds, Upper Crinoidea Beds

Thick carbonate rocks were developed in the depression of the Tarim craton during the Cambrian-Middle Ordovician periods. The compressional tectonic movement during the Middle Caledonian-Hercynian created the paleouplifts, which became the base for the paleokarst in the Ordovician carbonate rocks. Based on the large quantity of seismic, drilling, and geological outcrop data, this study analyzed the

A thorough data analysis combined with groundwater modelling was conducted in an Austrian binary karst aquifer to better understand changes in the hydrological behaviour observed at a karst spring. During a period of 4 years after a major flood event the spring hydrograph appears to be more damped with lower peak flow and higher baseflow than in the years before. The analysis of the hydrograph recession