404 research outputs found
Distribution of petroleum enriched areas, Changling Sag, Southern Songliao Basin
No full textChangling Sag of the southern Songliao Basin is a terrestrial hydrocarbon-rich depression, and according to the “sag-wide oil-bearing theory”, oil and gas can be found in its whole effective source rock area. But prolific oil and gas areas that are usually called “sweet spots” are still controlled by several main factors in distribution. Fault belts above low uplifts and basement faults not only are the pathways allowing for hydrocarbon migration, but can form the lateral barriers of reservoirs, they are the main boundaries of oil and gas enriched areas. On the other hand, the fracture zone developed in the vicinity of the faults has improved the reservoir connectivity and increased the chances to obtain high production. These make the fault-developed zone itself become a “sweet spots” belt rich in oil and gas that should be paid more attention in exploration. Key words: Changling Sag, prolific oil and gas area, controlling factors, fault-developed belt, sweet spot
3D-Basin Modeling of the Changling Depression, NE China: Exploring Petroleum Evolution in Deep Tight Sandstone Reservoirs
No full textThe Changling Depression is the largest and most resource-abundant reservoir in the South Songliao Basin, NE China. The petroleum evolution rules in the Lower Cretaceous deep tight sandstone reservoir are unclear. In this study, 3D basin modeling is performed to analyze the large-scale petroleum stereoscopic migration and accumulation history. The Changling Depression has a complex fault system and multiple tectonic movements. The model is calibrated by the present formation temperatures and observed maturity (vitrinite reflectance). We consider (1) three main erosion episodes during the burial history, one during the Early Cretaceous and two during the Late Cretaceous; (2) the regional heat flow distribution throughout geological history, which was calibrated by abundant measurement data; and (3) a tight sandstone porosity model, which is calibrated by experimental petrophysical parameters. The maturity levels of the Lower Cretaceous source rocks are reconstructed and showed good gas-generation potential. The highest maturity regions are in the southwestern sag and northern sag. The peak hydrocarbon generation period contributed little to the reservoir because of a lack of seal rocks. Homogenization temperature analysis of inclusions indicated two sets of critical moments of gas accumulation. The hydrocarbon filling in the Haerjin and Shuangtuozi structures occurred between 80 Ma and 66 Ma, while the Dalaoyefu and Fulongquan structures experienced long-term hydrocarbon accumulation from 100 Ma to 67 Ma. The homogenization temperatures of the fluid inclusions may indicate a certain stage of reservoir formation and, in combination with the hydrocarbon-accumulation simulation, can distinguish leakage and recharging events
Spatial Characteristics and Genesis of Tight Clastic Reservoirs in Yingcheng Formation of Changling Fault Depression in the Southern Songliao Basin
No full textTight oil and gas has become a hot spot for unconventional oil and gas exploration. How to find high-quality reservoirs under the conditions of low porosity and permeability has become a key issue restricting tight oil and gas exploration. This paper takes the deep-seated tight clastic rocks in the Changling fault depression in the Songliao Basin as the research object and comprehensively applies various technologies and methods such as microscopic observation, temperature measurement of inclusions and paleopressure recovery, and water-rock simulation experiments, to summarize the storage of tight reservoirs. Set space types and analyze their formation mechanism. The research results show that (1) the tight clastic reservoir space types of Yingcheng Formation in the Longfengshan subsag of the Changling fault depression in the southern Songliao Basin include residual primary pores, secondary dissolved pores, and microfractures, with mainly secondary dissolved pores; (2) pore lining chlorite is an important mechanism for the preservation of primary pores; (3) water-rock simulation experiments have confirmed that volcanic rock cuttings are easy to dissolve and are the main contributor to the secondary dissolution pores in the study area; and (4) the Raman displacement technique of methane inclusions has confirmed the existence of overpressure, which is the cause of hydrocarbon generation and pressurization and is the main motivation for a microcrack formation
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Advanced Nanomaterials for Renewable Energy and Sustainability
No full textLithium-ion batteries (LIBs) is believed to be one of the most promising alternatives to non-renewable fossil fuels for energy crisis, environmental protection and sustainable development. To further increase the energy and power densities of LIBs, nanostructured silicon and its nanocomposites were synthesized to achieve high-capacity, environmentally benign, and highly scalable candidates for the next generations of Li-Ion anodes. Herein, four distinct silicon-based nanostructures were synthesized and thoroughly characterized including silicon-carbon fabrics, nano-silicon from unrecycled glass bottles (gSi), conducting hydrogel coated silicon nanocomposites, and graphene wrapped conducting polymer-silicon hybrid structure. The electrochemical properties of silicon based nanomaterials were characterized in terms of cyclic voltammetry (CV), long-term capacity stability, rate capability and potentiostatic electrochemical impdedance spectroscopy (PEIS), and galvanostatic charge-discharge curves. Highly flexible and free-standing silicon-carbon (Si/C) fabrics are synthesized via simultaneous double-nozzle electrospinning. The binderless and current collector-free fabrics are used as Li-ion anodes with an overall capacity of ~1000 mAh g-1. 92 % capacity retention after 100 cycles coupled with the excellent rate capability up to 9.3 A g-1 demonstrate its superior flexibility over the conventional electrodes. A conversion from potential glass waste into high-purity nano-silicon is synthesized by a surface protected magnesiothermic reduction. Carbon-coated glass derived-silicon (gSi@C) anodes demonstrate excellent electrochemical performance with a capacity of ~1420 mAh g-1 at C/2 after 400 cycles. Full cells are assembled using gSi@C anodes and LiCoO2 cathodes, and achieve good cycling stability with high energy density.Conducting hydrogels are formed to coat Si surfaces via an in-situ polymerization process. Functional groups from hydrogels chemically improve the adhesion of conducting coatings on Si surface, rendering the Si-hydrogel hybrid structure without resistive binders and carbon black. It is observed that the degree of enhancing the cycling stability and rate capability of the conductive hydrogels decrease in the order of polypyrrole (PPy) > polyaniline (PANI) > poly(acrylic acid) (PAA). Silicon nanoparticles (SiNPs) are coated with polypyrrole-hydrogel and wrapped with reduced graphene oxide sheets (rGO) via an environmentally benign and scalable sol-gel process. The PPy/SiNPs/rGO electrodes can produce highly reversible capacities of 1312, 1285 and 1066 mAh g-1 at 100, 250 and 500 cycles at a high current density of 2.1 A g-1, respectively
Speculum Observation and Trajectory Measurement in Gas Extraction Drilling: A Case Study of Changling Coal Mine
No full textCoal will still be China’s basic energy for quite a long time. With the increase of mining depth, gas content and pressure also increase. The problems of gas emission and overrun affect the safety and efficient production of coal resource to a certain extent. In this work, the field test of gas drainage borehole peeping and trajectory measurement in coal seam of Changling coal mine are carried out. These coal seams include C5b coal seam, upper adjacent C5a coal seam, C6a coal seams, C6c in lower adjacent strata, and C5b coal seam in high-level borehole. The view of gas drainage borehole peeping and trajectory measurement in the working seam, upper adjacent layer, lower adjacent layer, and high position are obtained. It is found that the hole collapses at the position of about 20 m in both adjacent strata and high-level boreholes, and there are a lot of cracks in the high-level boreholes before 12 m. The deviation distance of high-level borehole is large, and the actual vertical deviation of upper adjacent layer is small. Finally, the strategies to prevent the deviation of drilling construction are put forward. It includes four aspects: ensuring the reliability of drilling equipment, reasonably controlling the drilling length, standardizing the drilling, and reasonably selecting the drilling process parameters
Annual precipitation variability inferred from tree-ring width chronologies in the Changling-Shoulu region, China, during AD 1853-2007
No full textOn the basis of a significant correlation between the tree-ring width series from Changling-Shoulu (CLSL) in north-central China and observed instrumental data, the annual total precipitation of the previous July to the current June was reconstructed since 1853 for the studied region, with the predictor variables accounting for 41.2% of the variance in the precipitation data. Distinct wet periods with precipitation levels greater than the mean (315 mm) occurred in 1864-1876 and 1934-1960. Notable dry periods with precipitation less than the mean occurred in 1877-1888 and 1923-1933. The precipitation fluctuated dramatically during 1940-1970, and became relatively stable around the mean value from 1960. The CLSL precipitation series showed significant correlations with precipitation reconstructions from Mt. Xinglong, Mt. Helan, Ningwu and eastern China, suggesting that these five rainfall curves represent the general precipitation variations in the western-central environmentally sensitive zone of northern China. The calculations of the CRU grid points also indicate the existence of significant spatial correlation among these sites. Periodicity analysis showed clear 23.33-, 8.24-, 2.64- and 2.59-year cycles at a 99% confidence level for the reconstructed series during the past 155 years.</p
Spatial and temporal distributions of the late Mesozoic volcanic successions and their controlling effects on the Changling fault depression of the Songliao Basin, NE China
No full textAbstract: Volcanic successions, including their spatial, temporal, tectonic, and geochemical attributes, were identified based on well data, 2D/3D seismic data, U-Pb isotopic ages, and major and trace element data from the Changling fault depression of the Songliao Basin in northeastern China. Three eruption cycles developed in the Changling fault depression: K1h (Huoshiling Formation) (118–124 Ma), K1yc1 (first member of the Yingcheng Formation) (115–106 Ma), and K1yc3 (third member of the Yingcheng Formation) (106–102 Ma). These three eruption cycles comprised seven eruption stages. The volcanic successions in every eruption cycle were bimodal and evolved from basic to acidic. The magma of the basic and intermediate rocks in these cycles was derived from partial melting of the asthenosphere. In K1yc1 and K1yc3, partial melting of the newly formed basic rocks in the lower crust formed the high-SiO2 acidic magma. In addition, fractional crystallization of basic magma formed the small-scale intermediate–acidic magma. In K1h, the most likely origin of the acidic magma was fractional crystallization of basic magma. During the early stage of the fault depression, the volcanic rocks of K1h were controlled primarily by the boundary fault activity. In K1yc1 and K1yc3, basic–intermediate rocks were distributed widely along syngenetic faults, and acidic rocks were concentrated in areas where the syngenetic faults had their largest amplitudes. Multiple cycles and stages of the volcanic successions were controlled by magmatic evolution, and the spatial distribution was controlled by basin tectonics.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
Asca submajor Ma 2003
No full textAsca submajor Ma, 2003, Acta Zootaxonomica Sinica, 28 (1): 70. Holotype female, paratypes 3 females, 1 deutonymph, from grassland soil in Jilin (Changling), types in NBPBC.Published as part of Lin, Jian-Zhen, 2022, Researcher Li-Ming MA: Contributions to systematic acarology and entomology, pp. 64-102 in Zootaxa 5159 (1) on page 67, DOI: 10.11646/zootaxa.5159.1.3, http://zenodo.org/record/677078
Cheiroseius changlingensis Ma 2000
No full textCheiroseius changlingensis Ma, 2000, Acta Arachnologica Sinica, 9 (2): 65. Holotype female, paratypes 3 females, from grassland soil in Jilin (Changling), types in NBPBC.Published as part of Lin, Jian-Zhen, 2022, Researcher Li-Ming MA: Contributions to systematic acarology and entomology, pp. 64-102 in Zootaxa 5159 (1) on page 68, DOI: 10.11646/zootaxa.5159.1.3, http://zenodo.org/record/677078
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