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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Du Q.,Shandong University of Science and Technology | Han Z.,Shandong University of Science and Technology | Han Z.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Shen X.,Shandong University of Science and Technology | And 8 more authors.
International Geology Review | Year: 2017

We report zircon U–Pb geochronologic and geochemical data for the post-collisional volcanic rocks from the Batamayineishan (BS) Formation in the Shuangjingzi area, northwestern China. The zircon U–Pb ages of seven volcanic samples from the BS Formation show that the magmatic activity in the study area occurred during 342–304 Ma in the Carboniferous. The ages also indicate that the Palaeo-Karamaili Ocean had already closed by 342 Ma. Moreover, the volcanic rocks also contained 10 inherited zircons with ages ranging from 565 to 2626 Ma, indicating that Precambrian continental crust or microcontinents with accretionary arcs are two possible interpretations for the basement underlying the East Junggar terrane. The sampled mafic-intermediate rocks belong to the medium-K to high-K calc-alkaline and shoshonitic series, and the formation of these rocks involved fractional crystallization with little crustal contamination. These Carboniferous mafic-intermediate rocks show depletions in Nb and Ta and enrichments in large ion lithophile elements (e.g. Rb, Ba, U, and Th) and light rare earth elements. The low initial 87Sr/86Sr values (0.7034–0.7042) and positive εNd(t) values (+2.63 to +6.46) of these rocks suggest that they formed from depleted mantle material. The mafic-intermediate rocks were most likely generated by 5–10% partial melting of a mantle source composed primarily of spinel lherzolite with minor garnet lherzolite that had been metasomatized by slab-derived fluids and minor slab melts. In contrast, the felsic rocks in the BS Formation are A-type rhyolites with positive εNd(t) values and young model ages. These rocks are interpreted to be derived from the partial melting of juvenile basaltic lower crustal material. Taken together, the mafic-intermediate rocks formed in a post-collisional extensional setting generated by slap breakoff in the early Carboniferous (342–330 Ma) and the A-type rhyolites formed in a post-collisional extensional setting triggered by the upwelling asthenosphere in the late Carboniferous (330–304 Ma). © 2017 Informa UK Limited, trading as Taylor & Francis Group


Chen W.,Chengdu Institute of Geology and Mineral Resources | Chen W.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | Zhan W.,Chengdu Institute of Geology and Mineral Resources | Zhan W.,Key Laboratory for Sedimentary Basin and Oil and Gas Resources | And 5 more authors.
Geological Bulletin of China | Year: 2017

Early Cretaceous bitumens were found for the first time in Esima area in southern Qiangtang Basin. The authors analyzed the organic geochemical characteristics from the bitumen content of organic carbon and group composition and biomarkers in this area and discussed the oil-source correlation. The result reveals that the total organic carbon content of the bituments samples varies in the range of 3.42% ~75.01%, indicating abundant bitumens. The bitumen samples have the highest fraction of heavy hydrocarbons (nonhydrocarbon and asphaltene), followed by aromatics hydrocarbon, and the lowest fraction is saturated hydrocarbon. The maturity of bitumens are not in high maturity and are mainly in the mature stage. The source rock was deposited under reductive conditions, and the original organic matter was algae and high-grade plants, with especially important contribution made by algae. Oil-source correlations were studied by using the biomarkers, and the results show that the bitumens were derived from the Suowa Formation mudstones. The results obtained by the authors are important for oil and gas exploration in southern Qiangtang Basin. © 2017, Science Press. All right reserved.


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.


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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