Abstract. Iron oxide compounds constitute an important component of mineral dust aerosols. Several previous studies have shown that these minerals are strong absorbers at visible wavelengths and thus they play a critical role in the overall climate perturbation caused by When compiling database complex refractive indices possible species iron oxides to study their optical properties, we found uniformly continuous constants for single type wavelength range between 0.2 50 μm very scarce, use...

Abstract This study delves into the micro-occurrence states and enrichment mechanisms of residual oil, pivotal for advancing production from tight sandstone reservoirs, particularly Chang 8 Member Upper Triassic Yanchang Formation, Ordos Basin. Through an analysis 23 core samples, employing high-pressure mercury injection, field emission scanning electron microscopy, thin section, X-ray diffraction techniques, distinct reservoir types were categorized. The utilization environmental...

Understanding the micro-occurrence mechanism of tight oil has long been a daunting challenge in exploration and development unconventional resources. This article discusses through continuous extraction by combining thin casting, fluorescent sections, environmental scanning electron microscope observations, physical property testing, X-ray diffraction experiments. The results indicated that sandstone Chang 8 Formation Ordos Basin, average content was 35.46% for microscale pores, 35.74%...

Low‐maturity soft bitumen (or biodegraded heavy oil) and higher maturity solid are present in Palaeozoic siliciclastics at Tianjingshan the NW Sichuan Basin, southern China. The origin of these bitumens variable maturities was investigated. Samples low‐maturity from Lower Devonian sandstones high‐ Upper Cambrian siltstones were analysed to investigate their organic geochemistry stable isotope compositions. Permian black shales also investigated assess source rock potential, burial maturation...

In this study, the formation mechanism of authigenic chlorite in tight reservoirs and its influence on adsorption capacity to oil have been analyzed. The occurrence states analyzed by thin section (TS) field emission scanning electron microscopy (FE-SEM) measurements. Due alteration volcanic rock fragments, mudstone pressurized water, dissolution early chlorite, material source has provided for chlorite. time with different is following order: grain-coating → pore-lining dissolved pores...

The Kuqa Basin is a typical foreland basin in northwest China, characterized by compressive fold-and-thrust belts and regionally distributed huge salt layer. A large number of overthrust faults, fault-related folds, salt-related structures are formed on the thrust belt due to strong compression structural deformation, causing difficulty simulation basin. In this study, modeling thermal history complicated compressional profiles was successfully conducted based advanced “Block” function...

Gas adsorption experiments are becoming one of the most common methods to quantify and analyze pore structures shale samples in petroleum industry. In this regard, particle size specimen plays an important role results that could ultimately affect structure interpretation. Hence, study, five at different thermal maturity levels picked, all crushed into groups sizes: less than 40 mesh (<375 μm), 60 (<250 80 (<187.5 100 (<150 μm). Next, N2 is used characterize within sizes....

In order to investigate pore structure characteristics of Wufeng and Longmaxi Formations shales in the Sichuan Basin, organic geochemical parameter petrologic experiments, N2 CO2 adsorptions, field emission scanning electron microscopy analysis helium porosity measurement are carried out. Results showed that thermal maturity belong over-maturity stage with TOC content 1.84%–6.82% 2.6%–5.1%, respectively. The has a good correlation quartz, weak clay no carbonate, indicating matter is mainly...

Tight oil is a great potential resource for unconventional exploration and development. Determining the content of adsorbed tight in sandstone reservoirs factors controlling its crucial evaluation development resources. Using fluorescence petrography, environmental scanning electron microscopy, porosity as well permeability analyses, high-pressure mercury intrusion, nuclear magnetic resonance imaging, present study analyzed occurrence form, location, relative free oils effect on Chang 8...

Authigenic chlorite, which is frequently found in sandstone, has a controlling effect on the reservoirs tight oil adsorbed during hydrocarbon filling. In this study, content, occurrence state, timing, mechanism and influence of authigenic chlorite micro-occurrence states were studied using Thin Section (TS), Fluorescent (FTS), X-Ray Diffraction (XRD), Field Emission-Scanning Electron Microscopy (FE-SEM), Environmental Scanning (ESEM), Energy Dispersive Spectroscopy (EDS). The results...

The adsorption of crude oil in the tight sandstone reservoir is significant. Occurrence states adsorbed and its pore throat reduction effect are two significant directions exploration development. In this paper, occurrence state porosity permeability systematically analyzed based on a detailed description discussion space, states, changes permeability, controlling factors. Five recognized differences spatial location morphology oil. Adsorbed distributed all kinds spaces primarily...

The Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi black shales are the critical targets for shale gas exploration in Sichuan Basin of South China. enrichment organic matter (OM) is basis generation large-scale gas; however, its controlling factors Wufeng-Longmaxi still under debate, few studies have focused on edge Basin. Based mineral composition, total carbon (TOC), systematic inorganic geochemistry analysis 72 core samples from formations Well Xike 1, southeastern Basin,...

There is great potential for tight oil as an alternative to conventional fossil fuels throughout the world. Adsorption, mineralogy, and pore structure of sandstone are very important factors efficient development adsorbed from reservoirs. In this study, occurrence morphology varying structures was examined, well relationship between adsorption content morphology. X-ray energy dispersive spectra, environmental scanning electron microscope observations, thin fluorescence sections were used...

Abstract. Iron oxides compounds constitute an important component of mineral dust aerosol. Several previous studies have shown that these minerals are strong absorbers at visible wavelengths and thus they play a critical role in the overall climate forcing caused by When compiling database complex refractive indices possible species iron-oxides to study their optical properties, we found uniformly continuous constants for single type wavelength range between 0.2 50 μm is very scarce use...

Abstract Carbonate cements are an important type of cement in Permian tight gas reservoirs the Ordos Basin. Moreover, distribution carbonate sandstone provides basis for studying fluid mechanism and genesis a scientific investigating physical properties underground oil gas. Based on observations thin sections temperature measurements inclusions, this study concludes that area dominated by calcite ferrous divided into three phases, where latter two phases dominant. The material source is...

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The lower limits of petrophysical properties for an effective reservoir are among the key parameters assessing hydrocarbon reserves and therefore directly related to exploration development strategies. However, marine sandstone gas reservoirs still not clear impact factors also remain be discussed. This study analysed property in Qiongdongnan Basin using porosity, permeability testing. results showed that porosity developed deltas 8.9% 1.2 × 10−3 μm2, respectively, 11.3% 4.0 μm2 submarine...

Organic acids are critical to studying the formation of secondary porosity in tight lacustrine reservoirs, Ordos Basin. The expelled fluids produced through hydrocarbon evolution a semi-closed system under different pressure and temperature settings (16.9 MPa, 250 °C; 22.1 300 32.5 350 37.7 370 42.9 400 52.2 450 °C) were collected. In this study, 12 organic identified using ion chromatography, both concentration species indicate two-step process.