Key Laboratory for Sedimentary Basin and Oil and Gas Resources

Chengdu, China

Key Laboratory for Sedimentary Basin and Oil and Gas Resources

Chengdu, China

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Zeng S.-Q.,Chengdu Center | Zeng S.-Q.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Wang J.,Chengdu Center | Wang J.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 6 more authors.
Geology in China | Year: 2014

The first member of the Quemo Co Formation in the Woruo Mountain area of the North Qiangtang Basin is mainly composed of purplish red pebbly sandstone, medium to fine sandstone, and argillaceous siltstone, deposited in an oxidation environment. The lithologic characters, sedimentary structures, probability cumulative grain size curves, Sahu formula, grain-size parameters scattergram, and C-M pattern of the sandstones of the first member of the Quemo Co Formation all show that the sandstones are of bad sorting, and the frequency histogram is bimodal or multimodal, the probability cumulative curve of the sandstones mostly represents two-stage and a few three-stage, the percentage of the traction populations is high, and the percentage of the saltation and suspension populations is relatively low. In the Sk-σi, diagram, the sandstones of the first member of the Quemo Co Formation fall into the river sand area. Its C-M pattem has the typical feature of fluvial deposit, with the PQ section richly developed but the QR section poorly developed. The deposition of the Quemo Co Formation started with fluvial-alluvial facies, and then these strata were overlain by delta and restricted platform deposition, thus overall displaying a deepening-upward transgressive sequence.


Fu X.,Chengdu Institute of Geology and Mineral Resources | Fu X.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Wang J.,Chengdu Institute of Geology and Mineral Resources | Wang J.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 6 more authors.
Chemical Geology | Year: 2016

The Early Jurassic was characterized by a global disturbance of the carbon cycle known as the Toarcian oceanic anoxic event (T-OAE). This event is recorded by a large negative carbon-isotope excursion (CIE) in marine carbonates and marine organic matter, as well as fossil wood. Here, we present new high-resolution carbonate (δ13Ccarb) and organic (δ13Corg) carbon-isotope records and total organic content from the Bilong Co section in the Qiangtang Basin, the eastern Tethys. This section is high in organic carbon, and black shale facies are also identified. The Bilong Co section shows heavy δ13Corg values compared to other reported marine organic carbon-isotope values for the T-OAE. This is explained by variable mixing of terrestrial and marine organic matter. Compared to European sections, the magnitude of the negative CIE in the Bilong Co section is slightly different, which could be explained by different local paleoenvironmental conditions and strata missing. Although these, the carbon-isotope profile from the Bilong Co area displays a similar trend to those in contemporaneous strata in the western Tethyan and Boreal realms of NW Europe, which is characterized by a distinct negative excursion in the Early Toarcian. Our new data from the Bilong Co section in N Tibet provide the first high-resolution record of the Early Toarcian Oceanic Anoxic Event in the eastern Tethys. © 2016


Sun W.,Chengdu Center | Chen M.,Chengdu Center | Zeng S.-Q.,Chengdu Center | Zeng S.-Q.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources
Geological Bulletin of China | Year: 2013

The Lower part of Suowa Formation in the north Qiangtang depression of Tibet has been correlated to the Late Jurassic. However, dating evidence of the upper part of the formation remains insufficient. Three reefal units from Suowa Formation in Bandaohu area are gende morphologically and composed of corals and stromatoporoids frameworks. The community structures show that benthic metazoanl taxa are mainly of Pachythecopora pachytheca Deng, Actinostromaria motianlingensis Dong et Wang and Spon-giomorpha robusta Yang et Wang, and subordinately of Latusastraea xigazeensis Liao et Xia, Preverastraea sp., Ptychochaetes cf glo-bosus Koechlin and Spongiomorpha asiatica xainzaensis Deng. The pollen assemblages marked by Dicheiropollis etruscus from the upper part of the Suowa Formation are initial elements of the Early Cretaceous in the surrounding areas of the Tethys. Moreover, Senegalosporites and Steevesipollenites have never been recorded from horizons in advance of the Cretaceous, and they are common in the pollen assemblages of the late Early Cretaceous and even later. Therefore, coral and pollen assemblages indicate that the main part of the Suowa Formation is correlated to the Upper Jurassic, and the upper part of the formation is reasonably assigned to the Lower Cretaceous.


Zeng Y.H.,Chengdu Institute of Geology and Mineral Resources | Zeng Y.H.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Fu X.G.,Chengdu Institute of Geology and Mineral Resources | Fu X.G.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 3 more authors.
Journal of Petroleum Geology | Year: 2013

Upper Triassic coal-bearing strata in the Qiangtang Basin (Tibet) are known to have source rock potential. For this study, the organic geochemical characteristics of mudstones and calcareous shales in the Upper Triassic Tumengela and Zangxiahe Formations were investigated to reconstruct depositional settings and to assess hydrocarbon potential. Outcrop samples of the Tumengela and Zangxiahe Formations from four locations in the Qiangtang Basin were analysed. The locations were Xiaochaka in the southern Qiangtang depression, and Woruo Mountain, Quemo Co and Zangxiahe in the northern Qiangtang depression. At Quemo Co in the NE of the basin, calcareous shale samples from the Tumengela Formation have total organic carbon (TOC) contents of up to 1.66 wt.%, chloroform bitumen A contents of up to 734 ppm, and a hydrocarbon generation capacity (Rock-Eval S1+ S2) of up to 1.94 mg/g. The shales have moderate to good source rock potential. Vitrinite reflectance (Rr) values of 1.30% to 1.46%, and Rock-Eval Tmax values of 464 to 475 °C indicate that the organic matter is at a highly mature stage corresponding to condensate / wet gas generation. The shales contain Type II kerogen, and have low carbon number molecular compositions with relatively high C21-/C21+ (2.15-2.93), Pr/Ph ratios of 1.40-1.72, high S/C ratios (>0.04) in some samples, abundant gammacerane (GI of 0.50-2.04) and a predominance of C27 steranes, indicating shallow-marine sub-anoxic and hypersaline depositional conditions with some input of terrestrial organic matter. Tumengela and Zangxiahe Formation mudstone samples from Xiaochaka in the southern Qiangtang depression, and from Woruo Mountain and Zangxiahe in the northern depression, have low contents of marine organic matter (Type II kerogen), indicating relatively poor hydrocarbon generation potential. Rr values and Tmax data indicate that the organic matter is overmature corresponding to dry gas generation. © 2013 Scientific Press Ltd.


Fu X.,Chengdu Institute of Geology and Mineral Resources | Fu X.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Wang J.,Chengdu Institute of Geology and Mineral Resources | Wang J.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 4 more authors.
International Journal of Coal Geology | Year: 2013

The Tumen coal mine has the largest coal resources in Tibet, which have been developed and utilized as an important energy source in the last decades. It has raised some health problems during the coal exploration and utilization in Tibet. Fifty Late Triassic coal (or coaly) samples were picked up from the Qiangtang Basin (Tumen mine, Woruoshan and Hongshuihe areas) to determine the minerals, potentially hazardous elements and their mode of occurrence and possible sources. Coal samples from the Qiangtang Basin have medium- and high-ash yields (15.20-47.88%) with low or medium-high total sulfur content (0.04-4.86%). Minerals in Qiangtang Basin coal include clay minerals, dolomite, quartz, pyrite, siderite, and hematite, and trace amounts of halite, feldspar, anhydrite, barite, chromite, and galena. Potentially hazardous trace elements in coal samples include As, Hg, Pb, and Se. Arsenic is controlled mainly by aluminosilicate minerals. Mercury occurs mainly as an organic-bound form. The organically bound Pb is dominant. Selenium is controlled mainly by Fe-bearing (probably pyrite). A proportion of the elevated concentrations of As, Hg, Pb and Se in Qiangtang Basin coal may be related to underlying shale bed. These elements might have been eroded or leached from the shale bed, which were subsequently transported and accumulated syngenetically in the coal-forming peat swamps. The enrichment of As, Hg, Pb, and Se in Qiangtang Basin coal, however, is also partly to be related to magmatic/hydrothermal fluids. © 2013 Elsevier B.V.


Peng Q.,Chengdu Institute of Geology and Mineral Resources | Peng Q.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Du B.,Chengdu Institute of Geology and Mineral Resources | Du B.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2013

Shale gas, as a clean energy of great prospects, has become the research hotspot in petroleum geology field, recently. Shale gas exploration of Qiangtang Basin, where several high quality mud-shale source rocks developed, is still in initial stage. Through the analysis of key geological parameters of domestic and international main shale gas basins in exploration and development, we sum up the evaluation standard of favorable shale gas exploration targets. Based on the comprehensive evaluation of the main mud-shale hydrocarbon source rock thickness, organic matter maturity, organic matter type, organic carbon content of Qiangtang Basin, we discover that in Qiangtang Basin, two sets of favorable shale gas exploration layer developed: mud-shale layer of the upper Triassic, mud-shale layer of lower Jurassic Quse Formation. And we select five favorable shale gas areas: Zangxiahe favorable area, Woruoshan favorable area, Tumengela favorable area, Biluocuo favorable area, Mugouriwang favorable area.


Du Q.,Chengdu Institute of Geology and Mineral Resources | Du Q.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Wang Z.,Chengdu Institute of Geology and Mineral Resources | Wang Z.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 7 more authors.
Precambrian Research | Year: 2013

The Yangtze Block is an important component in reconstructing the Proterozoic tectonic evolution of South China within the Rodinia supercontinent. The geochronology and paleoenvironment of the Liantuo Formation in the Yangtze Block are still highly controversial. An integrated approach of facies analysis, paleogeography and geochronology provides new insights into understanding the sedimentology and paleogeography of the formation. Here, results are presented from a detailed U-Pb zircon examination of geochronology and paleoenvironment of the Liantuo Formation in the Yangtze Block. The formation was deposited in the period of ca. 790-730. Ma, which coeval with the development of the Wuqiangxi Formation in the middle-upper part of the Banxi Group. The top of the Liantuo Formation gives a U-Pb age of 736. ±. 5.8. Ma, which signifies an onset time of the Sturtian glaciation as ca. ≤730. Ma. The zircon U-Pb ages reveal magmatic events that were correlated with Neoproterozoic continental growth indicating that the Rodinia initiated rifting occurred at ca. 824. Ma and extensive rift-related magmatism took place at ca. 780. Ma in the northern Yangtze Block. Moreover, these results provide geochronological and petrologic evidence that confirms the stratigraphic framework of the Nanhuan System, thereby promoting a better understanding of the Neoproterozoic tectonic development of South China. © 2013 Elsevier B.V.


Wang Z.,Chengdu Institute of Geology and Mineral Resources | Wang Z.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Wang J.,Chengdu Institute of Geology and Mineral Resources | Wang J.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 8 more authors.
Journal of Asian Earth Sciences | Year: 2013

Although some Archean zircons (xenocrysts) have been reported in various places in the South China, Archean outcrops within the Yangtze Block have been spotted only in the Kongling terrain. Recently, the findings of a Neoarchean K-granite pluton emplaced within the Yangpo Group have opened a new window to study the formation and evolution of the Yangtze Block. We conducted a combined study of zircon U-Pb and whole-rock major and trace elements for seven quartz schist and two granite samples from the Yangpo Group in the Huji region, South China. It is another Archean outcrop in the Yangtze Block except for the Kongling terrain. Results of LA-ICP-MS dating for the detrital zircons from the quartz schist of the Yangpo Group indicate two age groups originating from two significant magmatic events at ~2.8Ga and ~3.05Ga, as well as the ~2.9Ga and ~3.2-3.3Ga magmatism identified in a previous study. The quartz schists of the Yangpo Group show high SiO2 content and K2O/Na2O ratios, and low TiO2, Fe2O3, and MgO contents. Two granitic samples from the Yaozishan pluton display relatively high SiO2 and high alkali contents, low MgO, TiO2, and P2O5 content, and high A/KNC ratios (1.21-1.31), exhibiting an aluminous feature. At the same time, the two samples show positive anomalies of HFSE (Zr, Hf, Y) and LILE (Rb, U, Th, La), and high Rb/Sr and 104×Ga/Al ratios. These geochemical observations are typical of A-type granites. The LA-ICP-MS dating results of the Jinshan and Yaozishan Granitic plutons further confirm the within-plate rifting and A-type granite emplacing event at ~2.65Ga. Compared with the Jinshan A-type granite, the Yaozishan A-type granite has a distinct feature of abnormally high 104Ga/Al ratios (6.19-6.23) and lower zirconium saturation temperature (772-778°C), which indicates that the Yaozishan A-type granite emplacing at ~2673Ma be associated with an early episode of the plate rifting event in the middle Neoarchean. These results suggest that the Yangpo Group be developed from ~2.8Ga to ~2.7Ga, as filling sequence of a passive continental margin or intracratonic basin. Thus, our study reveals for the first time that the preliminary cratonization of the Central Yangtze Block ended ~2.8Ga followed by the filling of the craton basin, plate collision at ~2.7Ga, and post-collision rifting at ~2.65Ga. © 2013 Elsevier Ltd.


Fu X.,Chengdu Institute of Geology and Mineral Resources | Fu X.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Wang J.,Chengdu Institute of Geology and Mineral Resources | Wang J.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 5 more authors.
Energy Conversion and Management | Year: 2013

The Qiangtang Basin is the biggest residual petroleum-bearing basin in the Qinghai-Tibet Plateau, and is also an area of continuous permafrost in southwest China with strong similarities to other known gas-hydrate-bearing regions. Permafrost thickness is typically 60-180 m; average surface temperature ranges from -0.2 to -4.0 C, and the geothermal gradient is about 2.64 C/100 m. In the basin, the Late Triassic Tumen Gela Formation is the most important gas source rock for gas, and there are 34.3 × 108 t of gas resources in the Tumen Gela Formation hydrocarbon system. Seventy-one potential anticline structural traps have been found nowadays covering an area of more than 30 km2 for each individual one, five of them are connected with the gas source by faults. Recently, a large number of mud volcanoes were discovered in the central Qiangtang Basin, which could be indicative of the formation of potential gas hydrate. The North Qiangtang depression should be delineated as the main targets for the purpose of gas hydrate exploration. © 2013 Elsevier Ltd. All rights reserved.


Fu X.,Chengdu Institute of Geology and Mineral Resources | Fu X.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Tan F.,Chengdu Institute of Geology and Mineral Resources | Tan F.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 6 more authors.
International Geology Review | Year: 2014

The Bilong Co oil shale, located in the South Qiangtang depression, northern Tibet Plateau, may record the Early Jurassic anoxic event in the eastern Tethys. New geochemical data from the Bilong Co oil shale section are presented in order to determine the mechanism of organic accumulation and to evaluate Early Jurassic anoxia in the eastern Tethys. In organic-rich oil shales, many redox proxies including the relationship of Mo to total organic carbon (TOC), Re/Mo ratios, and pyrite framboid size distribution suggest deposition under euxinic conditions. However, the correlation between TOC and P and Mo contents indicates that organic matter accumulation was controlled mainly by primary productivity. The Sr/Al ratios and clastic influx proxies such as Si, Ti, Th, Zr, and Al concentrations suggest a continuous supply of fresh water from a nearby continent during oil shale deposition. This supply could have initiated stratification of the water so that the upper zone became favourable for marine life. Increased primary productivity could have led to formation of anoxic/sulphidic bottom waters, which enhanced the preservation of organic matter. Deposition of organic-rich oil shales terminated when primary productivity decreased, leading to more oxic bottom water conditions. © 2014 © 2014 Taylor & Francis.

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