12 results on '"Wang, Xingzhi"'
Search Results
2. Alteration effects of karstification and hydrothermalism on middle Permian Qixia formation at the Wulong section, South China.
- Author
-
Shang, Junxin, Feng, Mingyou, Wang, Xingzhi, Zhang, Benjian, Xu, Liang, and Liu, Xiaohong
- Subjects
DOLOMITE ,RARE earth metals ,CARBONATE reservoirs ,PETROLOGY ,GEOCHEMISTRY ,KARST - Abstract
Middle Permian Qixia Formation in the southwestern region of Sichuan (SW China) has experienced multiphase fluidisation, resulting in an unclear understanding of the reservoir reconstruction effect. In this study, a systematic analysis of the Qi2 member in Wulong Town was carried out by combining field outcrop petrology and geochemistry. The results demonstrated that multiple sets of crystalline dolomite-bioclastic limestone cycles were stacked vertically in the Qi2 member, accompanied by the development of fractures and karst channels. The dolomite was mainly composed of silty-fine dolomite (D1) and recrystallised dolomite (D2). Furthermore, obvious multiphase dolomitic cements (Cd1-Cd2) were present in the fractures and pores. Early karst is known to have lithologic mutation surface development and karst channel development at the top of several secondary cycles. The vadose silt dolomites (Cd1) having karst channels developed dull luminescence under cathode luminescence (CL). Both the geochemical indicators of elements and rare earth element (REE) content indicated dysoxic-oxic environmental conditions. The hydrothermal solution displayed tectonic carniole characteristics in the strata burial stage. Fractures and pores were filled with hydrothermal minerals such as coarse dolomites-saddle dolomites (Cd2, with some caused by recrystallisation of the Cd1 hydrothermal solution) and fluorites. Coarse dolomites-saddle dolomites developed dull-red luminescence with a bright-red rim under CL and their δ
18 OVPDB values were more negative than those of middle Permian limestone samples. Both the geochemical indicators of elements and REE content indicated the suboxic-anoxic environmental conditions. Karstification had minor constructive impact on the reservoir of the Qi2 member in Baoxing in southwestern Sichuan. Most products of karstification were distributed as fillings in channels. Aside from creating certain networked fractures, the hydrothermal solution was mainly filled with hydrothermal minerals along the fractures, pores and early karst channels. Karst and the hydrothermal solution mainly damaged the middle and upper parts of the middle Permian Qixia Formation in Southwest Sichuan. The impact of episodic fluid on the restoration of the carbonate reservoir was mainly restricted by channels for fluid migration and thickness differences among the reservoir. However, certain thick-layered and massive crystalline dolomite may hold promise for exploration. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
3. Genesis of the Ordovician Ma55 sub-member dolomites in the Ordos Basin, China
- Author
-
Fei Huo, Yawen Li, Xiyan Yang, Yan Zhan, and Wang Xingzhi
- Subjects
010506 paleontology ,δ18O ,Dolomite ,Geochemistry ,010502 geochemistry & geophysics ,01 natural sciences ,Mineral resource classification ,Brining ,Geochemistry and Petrology ,Dolomitization ,Ordovician ,Sedimentary rock ,Dissolution ,Geology ,0105 earth and related environmental sciences - Abstract
To elaborate genesis of the Ordovician Ma55 Sub-member dolomites in the Ordos Basin, this study implemented a series of analyses, including petrological investigation and geochemical (constant and trace elements, and isotopes) characterization. Three main types of dolomites were identified, namely micritic dolomite, micritic silty dolomite and silty dolomite. Specifically, the micritic dolomite is featured by dull red luminescence, low degree of order, high Sr isotope value, positive linear MgO–CaO correlation, high contents of Na and Sr elements, low contents of Fe and Mn elements, obvious negative δ13C excursion and slightly positive δ18O value, all of which indicate a syngenetic–penesyngenetic closed, high salinity environment. In comparison, the micritic silty dolomite is characterized by no or extremely dull red luminescence, moderate-to-high degree of order, higher δ13C value, slightly lower 87Sr/86Sr ratio, and sharp decrease in contents of K, Al, Fe and Mn elements, all of which indicate this type of dolomite to be the product of seepage–reflux dolomitization. Moreover, difference in geochemical characteristics between micritic silty dolomites in the depression and those in the platform flat suggests the Mg-rich brine from the tidal flat to be the dolomitization fluid for the platform flat while the Mg-rich brine from the overlying Ma54 Sub-member to be the dolomitization fluid for the depression. Meanwhile, the silty dolomite is observed to have no or extremely dull red luminescence, high degree of order, heavy δ18O value, high Sr isotope, lower Na content, and higher Fe and Mn contents, which are attributed to burial dolomitization in the fresh water environment. The distribution of dolomite was demonstrated to be controlled by sedimentary microfacies, and the dolomite in the West Jingbian dolomitic flat area turns out to have the largest distribution area and thickness as well as the best reservoir capacity. Massive fractures and vugs were formed in the dolomitization process, which were the basis of high-quality reservoir formation, involving generation of a relatively small amount of intercrystalline micropores during the syngenetic–penesyngenetic dolomitization, intercrystalline pores after the penecontemporaneous dolomitization, and intercrystalline and dissolution pores during the burial dolomitization. Moreover, dissolution during hypergene and burial periods contributed to most of the reservoir space, while filling effect during the burial period significantly reduced porosity.
- Published
- 2021
4. Comparative analysis of characteristics and genesis of crude oils of the Zs block in the Tazhong area and the Ha 6 block in the Tabei area, Tarim basin
- Author
-
Wang Xingzhi, Fei Huo, Xiyan Yang, Huiwen Huang, and Wenli Xu
- Subjects
General Chemical Engineering ,0211 other engineering and technologies ,Geochemistry ,Energy Engineering and Power Technology ,Tarim basin ,02 engineering and technology ,General Chemistry ,Geotechnical Engineering and Engineering Geology ,Crude oil ,Fuel Technology ,Biomarker (petroleum) ,020401 chemical engineering ,Block (telecommunications) ,021105 building & construction ,Ordovician ,0204 chemical engineering ,Geology - Abstract
Ha6 block is located in the north of the Tarim Basin. In this study, the characteristics of the Ordovician crude oil in the Ha6 block were analyzed by the gas chromatography-mass spectrometry (GC-M...
- Published
- 2019
5. Cambrian crude oil in ZS well field, Tazhong area: characteristics, genesis, and comparison with ordovician crude oil
- Author
-
Wang Xingzhi, Huiwen Huang, Fei Huo, Zhiming Xu, and Qiang Wei
- Subjects
General Chemical Engineering ,0211 other engineering and technologies ,Geochemistry ,Energy Engineering and Power Technology ,Tarim basin ,02 engineering and technology ,General Chemistry ,Geotechnical Engineering and Engineering Geology ,Crude oil ,Fuel Technology ,Biomarker (petroleum) ,020401 chemical engineering ,021105 building & construction ,Ordovician ,0204 chemical engineering ,Geology - Abstract
In this paper, the Cambrian crude oil and source-rock geochemistry in the ZS well field of Tazhong area, Tarim Basin, was analyzed using the gas chromatography-mass spectrometry (GC-MC). Mo...
- Published
- 2019
6. Characteristics and genesis of the Ordovician crude oil in the RePu area, Halahatang sag, Tarim Basin, China
- Author
-
Wang Xingzhi, Jilin Li, Huiwen Huang, Fei Huo, and Zhiming Xu
- Subjects
Fuel Technology ,Source rock ,General Chemical Engineering ,Geochemistry ,Ordovician ,Energy Engineering and Power Technology ,Tarim basin ,General Chemistry ,Geotechnical Engineering and Engineering Geology ,China ,Crude oil ,Geology - Abstract
The RePu area is located in the Tarim Basin, China. Based on the exploration and development, this paper analyzed the characteristics of the Ordovician crude oil and the source rocks by gas chromat...
- Published
- 2019
7. A study on the relationship between graptolites and shale gas enrichment in the Wufeng–Longmaxi Formations of the Middle–Upper Yangtze region in China
- Author
-
Yuanhui Shi, Wang Xingzhi, Shi Wenrui, Aiguo Feng, Ziyi Wang, and Naidong Chen
- Subjects
Total organic carbon ,chemistry.chemical_classification ,010504 meteorology & atmospheric sciences ,Shale gas ,Geochemistry ,Drilling ,010502 geochemistry & geophysics ,01 natural sciences ,Sedimentary depositional environment ,chemistry ,Ordovician ,General Earth and Planetary Sciences ,Sedimentary rock ,Organic matter ,Oil shale ,Geology ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Previous studies on graptolites have mainly focused on stratigraphic division and sedimentary environment analysis. On the basis of previous studies of Ordovician and Silurian graptolites in the Middle–Upper Yangtze region, this paper makes full use of core analysis, drilling geological, experimental analysis, and logging data from wells and combines graptolite types in different sedimentary environments to identify 4 graptolite zones, WF1–WF4, and 9 graptolite zones, LM1–LM9, in the Silurian Longmaxi Formation in the Middle–Upper Yangtze region, among which WF2–LM4 present high total organic carbon (TOC), organic pore development, and shale gas enrichment and are favorable development zones. This study reveals that enrichment in graptolites has positive correlations with TOC, organic porosity, and total hydrocarbon content. The evolution of graptolites has contributed to the enrichment in organic matter and the formation of organic pores in shales and affects shale gas–bearing properties to a certain extent, which is an important indicator for shale gas reservoir evaluation.
- Published
- 2020
8. Paleoenvironment and Organic Matter Accumulation of the Upper Ordovician-Lower Silurian, in Upper Yangtze Region, South China: Constraints from Multiple Geochemical Proxies
- Author
-
Wang Xingzhi, Xiyan Yang, Jingwei Cui, Rukai Zhu, Shi Wenrui, Yiqing Zhu, and Zisang Huang
- Subjects
Control and Optimization ,South china ,paleoenvironment ,010504 meteorology & atmospheric sciences ,paleoproductivity ,terrigenous influx ,Geochemistry ,Energy Engineering and Power Technology ,010502 geochemistry & geophysics ,01 natural sciences ,lcsh:Technology ,Organic matter ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,Primary productivity ,0105 earth and related environmental sciences ,chemistry.chemical_classification ,Total organic carbon ,Renewable Energy, Sustainability and the Environment ,Terrigenous sediment ,lcsh:T ,paleoredox conditions ,Katian ,wufeng and longmaxi formations ,chemistry ,Ordovician ,Oil shale ,Geology ,organic matter accumulation ,Energy (miscellaneous) - Abstract
The origin of the organic-rich shale in the Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation is complex and controversial. This paper reports the geochemical data of Wufeng-Longmaxi Formations in the Upper Yangtze region to restore the paleoenvironment and explore the accumulation mechanism of organic matter. The total organic carbon (TOC) content of the Wufeng Formation was relatively high, with an average of 2.86%. The Lower Longmaxi Formation showed the highest TOC content, with an average of 3.99%, and the upper part was a continuously low value with an average of 1.22%. The paleoproductivity proxies (Babio, Cu/Al, Ni/Al, Siexcess) showed that in the Katian and Rhuddanian-Aeronian Stages, the Upper Yangtze Sea had high primary productivity, indicating that organic matter accumulation was more affected by terrigenous influx and redox conditions. Al, Zr, and Zr/Al indicated that terrigenous influx was relatively high in the Kaitian-Hirnantian Stages, it was at a constant low in the Rhuddanian Stage, and increased again in the Aeronian Stage. The correlations between redox-sensitive trace elements (Mo, U, V) and TOC indicate that the organic-rich shale of the Wufeng Formation was deposited in the anoxic&ndash, euxinic environment. In the Longmaxi Formation, organic-rich shales formed in a more hypoxic environment, and overlying organic-lean shales formed in a suboxic environment. Therefore, the anoxic&ndash, euxinic conditions of the Late Ordovician Yangtze Sea were the main reason for the organic matter accumulation, but the high terrigenous influx caused by regression and/or structural controls diluted the organic matter to some extent. For the Early Silurian, a complete transgression&ndash, regression cycle changed terrigenous influx and redox conditions, resulting in significant differences in organic matter accumulation.
- Published
- 2020
9. Genesis of the Ordovician Ma55 sub-member dolomites in the Ordos Basin, China.
- Author
-
Yang, Xiyan, Li, Yawen, Zhan, Yan, Huo, Fei, and Wang, Xingzhi
- Abstract
To elaborate genesis of the Ordovician Ma5
5 Sub-member dolomites in the Ordos Basin, this study implemented a series of analyses, including petrological investigation and geochemical (constant and trace elements, and isotopes) characterization. Three main types of dolomites were identified, namely micritic dolomite, micritic silty dolomite and silty dolomite. Specifically, the micritic dolomite is featured by dull red luminescence, low degree of order, high Sr isotope value, positive linear MgO–CaO correlation, high contents of Na and Sr elements, low contents of Fe and Mn elements, obvious negative δ13 C excursion and slightly positive δ18 O value, all of which indicate a syngenetic–penesyngenetic closed, high salinity environment. In comparison, the micritic silty dolomite is characterized by no or extremely dull red luminescence, moderate-to-high degree of order, higher δ13 C value, slightly lower87 Sr/86 Sr ratio, and sharp decrease in contents of K, Al, Fe and Mn elements, all of which indicate this type of dolomite to be the product of seepage–reflux dolomitization. Moreover, difference in geochemical characteristics between micritic silty dolomites in the depression and those in the platform flat suggests the Mg-rich brine from the tidal flat to be the dolomitization fluid for the platform flat while the Mg-rich brine from the overlying Ma54 Sub-member to be the dolomitization fluid for the depression. Meanwhile, the silty dolomite is observed to have no or extremely dull red luminescence, high degree of order, heavy δ18 O value, high Sr isotope, lower Na content, and higher Fe and Mn contents, which are attributed to burial dolomitization in the fresh water environment. The distribution of dolomite was demonstrated to be controlled by sedimentary microfacies, and the dolomite in the West Jingbian dolomitic flat area turns out to have the largest distribution area and thickness as well as the best reservoir capacity. Massive fractures and vugs were formed in the dolomitization process, which were the basis of high-quality reservoir formation, involving generation of a relatively small amount of intercrystalline micropores during the syngenetic–penesyngenetic dolomitization, intercrystalline pores after the penecontemporaneous dolomitization, and intercrystalline and dissolution pores during the burial dolomitization. Moreover, dissolution during hypergene and burial periods contributed to most of the reservoir space, while filling effect during the burial period significantly reduced porosity. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
10. Palaeo-redox environment analysis of Longmaxi formation shale in southern Sichuan basin by XRF and ICP-MS
- Author
-
Feng Mingyou, Pu Kun, Cai Jiacheng, Zhu Yiqing, and Wang Xingzhi
- Subjects
Multidisciplinary ,Environment analysis ,Sichuan basin ,Geochemistry ,Inductively coupled plasma mass spectrometry ,Oil shale ,Redox ,Geology - Published
- 2018
11. Cambrian crude oil in ZS well field, Tazhong area: characteristics, genesis, and comparison with ordovician crude oil.
- Author
-
Huo, Fei, Wang, Xingzhi, Xu, Zhiming, Huang, Huiwen, and Qiang, Wei
- Subjects
- *
PETROLEUM , *OIL wells , *HYDROCARBON analysis , *GAS condensate reservoirs , *GEOCHEMISTRY - Abstract
In this paper, the Cambrian crude oil and source-rock geochemistry in the ZS well field of Tazhong area, Tarim Basin, was analyzed using the gas chromatography-mass spectrometry (GC-MC). Moreover, the hydrocarbon source in the Tazhong was identified through oil–source correlation. The analysis of light hydrocarbons and biomarkers indicates that the Cambrian and Ordovician protokerogens are of marine sapropelic type formed in a strongly reducing environment. The result of oil–source correlation shows that both Cambrian crude oil in the ZS well field and Ordovician crude oil in the Tazhong area originated in the Cambrian–Lower Ordovician source rocks. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
12. Characteristics and genesis of the Ordovician crude oil in the RePu area, Halahatang sag, Tarim Basin, China.
- Author
-
Huo, Fei, Wang, Xingzhi, Xu, Zhiming, Huang, Huiwen, and Li, Jilin
- Subjects
- *
PETROLEUM prospecting , *GEOCHEMISTRY , *HYDROCARBONS , *CAMBRIAN explosion (Evolution) , *ORDOVICIAN Period - Abstract
The RePu area is located in the Tarim Basin, China. Based on the exploration and development, this paper analyzed the characteristics of the Ordovician crude oil and the source rocks by gas chromatography-mass spectrometry. The Ordovician carbonatite reservoir oil in this area exhibited light component, rich chain hydrocarbon and poor aromatic hydrocarbon. The composition of C7 compound showed the advantage of n-heptane, which belonged to type I generative kerogen, and it was deep buried highly mature crude oil. The crude oil biomarker compounds all exhibited high content of long-chain tricyclic terpanes and high Ts/Tm values. The large presence of alkane aromatization compounds indicated strong reducing environmental conditions during crude oil formation. By comprehensive judgment that the main oil source of the Ordovician reservoirs in the RePu area was the Cambrian source rock. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.