Research Center for Structures in Oil and Gas Bearing Basins

Hangzhou, China

Research Center for Structures in Oil and Gas Bearing Basins

Hangzhou, China
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Yu L.,Zhejiang University | Yu L.,Research Center for Structures in Oil and Gas Bearing Basins | Xiao A.,Zhejiang University | Xiao A.,Research Center for Structures in Oil and Gas Bearing Basins | And 8 more authors.
International Journal of Earth Sciences | Year: 2017

The Jurassic system is the major hydrocarbon source rock and of crucial importance for understanding the Mesozoic intra-continental tectonics in West China. This paper presents systematic detrital zircon geochronology of the Jurassic outcropping at the Dameigou locality in the northern Qaidam Basin, and reports ~1000 single-grain U-Pb zircon ages that have implications for the provenance, the corresponding basin property as well as the tectonic setting of West China during Jurassic. Zircon ages exhibit two major clusters at ~250 and ~2400 Ma whereas two minor clusters at ~450 and ~850 Ma, suggesting primary sources from the East Kunlun Shan and Oulongbuluke Block, secondary sources from the North Qaidam UHP belt and South Qilian Shan. Combined with observation of lithology and sedimentary facies, two rifting periods were inferred in the earliest Jurassic and the early stage of the Middle Jurassic, respectively, accompanied by further extension throughout the Jurassic. Our results do not support a foreland basin related to the Jurassic southward thrusting of the South Qilian Shan, but favor that the Mesozoic intra-continental tectonics in West China were characterised by pulsed responses to specific collisions rather than a persisting contractional setting during Jurassic period. © 2017 Springer-Verlag Berlin Heidelberg


Wu L.,Zhejiang University | Wu L.,Research Center for Structures in Oil and Gas Bearing Basins | Xiao A.,Zhejiang University | Xiao A.,Research Center for Structures in Oil and Gas Bearing Basins | And 8 more authors.
Science China Earth Sciences | Year: 2012

The Altyn Tagh Fault and the Altyn Mountain define respectively the tectonic and geographical northern edges of the Tibetan Plateau, and figure prominently in the growth and rising mechanism of the plateau. The rhombus-shaped Altyn Mountain has long been thought to have an intimate relation with the Altyn Tagh Fault; however, its formation mechanism remains unclear and debatable. In this paper, we focus on the EW-trending uplifts in the Altyn Mountain, and investigated three Cenozoic sedimentary sections in the vicinity of the EW-trending uplifts located along the southern side of the central segment of the Altyn Tagh Fault. Magnetostratigraphy and pollen analysis were used to constrain ages of the sediments. Clast composition of conglomerate and paleocurrents obtained from clast imbrications were applied to determine the provenance. We also established a geological section parallel to the Altyn Tagh Fault on sedimentary facies across the northwestern Qaidam Basin. The results indicate that these en-echelon EW-trending uplifts formed as early as ca. 36 Ma and were preferred to be under the control of basal shear of the Altyn Tagh Fault in the middle-lower crust, symbolizing the early uplift of the Altyn Mountain during the Cenozoic. Left-slip along the Altyn Tagh Fault occurring during the Miocene and afterwards displaced and altered these uplifts, shaping the Altyn Mountain to its present fabric. © 2012 Science China Press and Springer-Verlag Berlin Heidelberg.


Wu L.,Zhejiang University | Wu L.,Research Center for Structures in Oil and Gas Bearing Basins | Xiao A.,Zhejiang University | Xiao A.,Research Center for Structures in Oil and Gas Bearing Basins | And 7 more authors.
AAPG Bulletin | Year: 2014

We present a detailed structural analysis of geometry and temporal development of the Cenozoic faults in the southwestern part of the Qaidam Basin-the largest petroliferous sedimentary basin and the only one producing oil and gas within the Tibetan Plateau, northwest China-based on three-dimensional (3D) seismic and well-log data. The Cenozoic faults are mostly steep (50-70°), basement-involved reverse faults trending primarily west-northwest and secondarily north-south. The two fault sets are commonly linked to each other by west-northwest-oriented faults bending either southward at their eastern tips or northward at the western tips, and originated possibly from inversion of pre-existing extensional faults in response to the far-field effect of the Cenozoic India-Eurasia collision. Faults or fault segments active during different time periods were identified from isopach maps and verified via seismic reflection profiles, showing that the faults became active as early as the Paleocene in the southern part of the southwest Qaidam Basin and propagated dominantly northward and subordinately eastward over time. Measurement of throws on major faults indicates that fault activity intensified over time and culminated since the mid-Miocene. These faults have been an important factor in forming the oil fields in the southwest Qaidam Basin by improving permeability, forming anticlinal traps, and acting as conduits for oil migrating from source rocks to the reservoirs. Copyright © 2014. The American Association of Petroleum Geologists. All rights reserved.


Wu L.,Zhejiang University | Wu L.,Research Center for Structures in Oil and Gas Bearing Basins | Xiao A.,Zhejiang University | Xiao A.,Research Center for Structures in Oil and Gas Bearing Basins | And 10 more authors.
Cretaceous Research | Year: 2011

Formation of Mesozoic western China, which was dominated by tectonic amalgamation along its southern margin and associated intracontinental tectonisms, holds a key for interpreting the succedent Cenozoic evolution. This paper presents new data including lithology, sedimentary facies, stratigraphic contact, seismic interpretation and paleo-structures within the Upper Jurassic-Lower Cretaceous strata in the northern Qaidam Basin, NW China. These data all account for a contractional tectonic deformation in the earliest Cretaceous. The South Qilian Shan, according to the sedimentary features and provenance analysis, reactivated and exhumated during the deformation, controlling the deposition of the Lower Cretaceous sequences. A simplified model for the Late Jurassic-Early Cretaceous paleogeography and tectonics of the northern Qaidam Basin is accordingly proposed. The results also support a ∼25° clockwise rotation of the Qaidam Basin since the Early Cretaceous and a more accurate Mesozoic evolution process for the basin. This earliest Cretaceous deformation, associated with the reactivation of the South Qilian Shan at the time, are part of the intracontinental tectonisms in central Asia during the Mesozoic, and probably driven by both the closure of the Mongol-Okhostk Ocean to the north and the collision of the Lhasa and the Qiangtang blocks to the south. © 2011 Elsevier Ltd.


Chen X.,Zhejiang University | Chen H.,Zhejiang University | Cheng X.,Zhejiang University | Shen Z.,Research Center for Structures in Oil and Gas Bearing Basins | Lin X.,Research Center for Structures in Oil and Gas Bearing Basins
Tectonophysics | Year: 2015

The geology of Tian Shan provides an excellent example for understanding the intracontinental orogeny in the context of Indian-Eurasian convergence. Previous studies leave much space in basinfill deposition process to be assessed in the regions west to the Talas-Fergana fault (TFF). We improve the understanding by conducting new investigations on sedimentology and magnetostratigraphy in the Tierekesazi section of the foreland region of south West Tian Shan. Four lithofacies have been identified, (i) marine lithofacies from the Aertashi to Bashibulake Formations, (ii) lacustrine to fluvial (plain) lithofacies from the Keziluoyi to the middle Pakabulake Formations, (iii) alluvial sand-gravel sheet lithofacies in the upper Pakabulake Formation, and (iv) conglomerate lithofacies from the Atushi to Xiyu Formations. Magnetostratigraphic analysis, accompanied with biostratigraphic correlation, indicates that four lithofacies cover age intervals of ca. 65. Ma to 34. Ma, ca. 22.1. Ma to 12. Ma, 12. Ma to 5.2. Ma, and 5.2. Ma to approximately present (?), with the sediment accumulation rates increasing from ca. 2.4/3.3-3.5 (compacted/decompacted) cm/ka in the lithofacies (i), to 12.3/16-17. cm/ka in the lithofacies (ii), to 16.3/19.5-20.6. cm/ka in the lithofacies (iii), and finally to >. 22.8/>. 22.8. cm/ka in the lithofacies (iv). These results suggest three episodes of sedimentary events.Combined with previous results, these episodes of sedimentary events are attributed to tectonic activities that are widespread along south Tian Shan. We speculate that the Oligo-Miocene boundary event more directly and likely marks the initial underthrusting of the Tarim block beneath the south Tian Shan. The mid-Miocene and Mio-Pliocene boundary events, although approximately synchronous between the regions east and west to the TFF, have different structural expressions in the two regions. Such difference is proposed to cause the dextral slipping of the TFF, and more fundamentally, likely be driven by the northward indentation of the Pamir at this time. © 2015.


Wu L.,Zhejiang University | Wu L.,Research Center for Structures in Oil and Gas Bearing Basins | Xiao A.,Zhejiang University | Xiao A.,Research Center for Structures in Oil and Gas Bearing Basins | And 10 more authors.
Terra Nova | Year: 2012

Terra Nova, 24, 387-395, 2012 We analysed provenance of conglomerate in a geological section spanning late Eocene to Pliocene using the gravel-count method in the NW Qaidam Basin, NW China. The result indicates that the clasts were all derived from the Altyn Mountain to the north with a sudden alteration at ca. 15Ma, and supports a two-stage evolution model for the Cenozoic Altyn Tagh Fault (ATF) highlighting the history prior to the initiation of left-slip movement on the ATF. During the first stage of ca. 36-15Ma, the ATF was a basal shear zone confined in the middle - lower crust and created obvious uplift of the Altyn Mountain. During the second stage since ca. 15Ma, the crust beneath the Altyn Mountain was eventually split, and left-slip movement on the ATF then initiated. © 2012 Blackwell Publishing Ltd.


Wu L.,Zhejiang University | Wu L.,Research Center for Structures in Oil and Gas Bearing Basins | Gong Q.,BGP Inc. | Qin S.,BGP Inc.
Acta Petrologica Sinica | Year: 2013

The active left-lateral Altyn Tagh Fault (ATF) defines the tectonic northern edge of the Tibetan Plateau, and is one of the largest and most important faults worldwide. The fast slip along the fault is regarded as one of the major ways to absorb the India-Tibet convergence. However, when did Cenozoic left-slip on the ATF initiate remains a subject of hot debate possibly due to the complexity of the fault itself. In this paper, we focus on the various geological responses to the left-slip on the fault, and figure out their formation time which is helpful in understanding the timing of left-slip along the ATF. They are: (1) provenance change in western Qaidam Basin; (2) Late Cenozoic flexural SE Tarim Basin; (3) NE-SW directed upper-crustal shortening in NE Tibetan Plateau; (4) strike-slip related basins and (5) the linear mountain along the ATF. The result shows that these slip-related phenomena all formed after Mid-Miocene (ca. 15 ±2Ma), which we accordingly interpret as the initial time of left-slip along the ATF. We also analyze the possible reason for the discrepancy between Cenozoic long-term slip rates and reported Quaternary slip rates along the ATF, and discuss the ways how the activities of the ATF formed the Altyn Mountain and controlled the Mid-Miocene tectonic reorganization in NE Tibetan Plateau.


Xiao A.,Zhejiang University | Xiao A.,Research Center for Structures in Oil and Gas Bearing Basins | Wu L.,Zhejiang University | Wu L.,Research Center for Structures in Oil and Gas Bearing Basins | And 2 more authors.
Acta Petrologica Sinica | Year: 2013

The active Altyn Tagh Fault in northern Tibetan Plateau is one of the largest and most significant linear structures in the world, and its Cenozoic activity is the important constraint on the growth mechanism of the Tibetan Plateau. In this paper, we illustrate that the Altyn Tagh Fault was dominated by basal shear during Late Eocene-Middle Miocene but by large-scale left-slip movement since then based on comprehensive analysis on uplifts of different trending in the Altyn Mountain and reported materials. We study systematically on the distribution, geometry and timing of the EW- and NW-trending fault systems inside the Qaidam Basin, and find that they are completely different fault systems forming in different time, different areas and controlled by different factors, showing a perfect coupling with the two-stage movement of the Cenozoic Altyn Tagh Fault. We also discover that height and width of the Altyn Mountain culminated in Mid-Miocene and then decreased according to the sedimentary and structural characteristics in NW Qaidam Basin, which can be well explained by the transition from basal shear to left-slip of the Altyn Tagh Fault.


Lou Q.Q.,Third Geological Group of Zhejiang Province | Lou Q.Q.,Zhejiang University | Xiao A.C.,Zhejiang University | Xiao A.C.,Research Center for Structures in Oil and Gas Bearing Basins | And 3 more authors.
Yanshi Xuebao/Acta Petrologica Sinica | Year: 2016

Depressions with terrestrial sediments is a unique and very important kind of sedimentary basins on earth, which usually develops by differential subsidence within Craton and /or thermal subsidence in the late stage of rift basin. In this paper, based on the characteristics of this type of basin, we put forward a method and workflow on basin Prototype reconstruction using a comprehensive analysis of sedimentary facies, isomaps of remnant thickness, regional cross-sections and related balance sections. The method and workflow include restoring the original boundaries of the basin using residual sedimentary facies, the original shapes during different stages using balanced cross-sections, and the original sediment thickness using relevant exploratory well data and balanced cross-sections. By this method we can research the basin prototype within the original shape of basin, which eliminates the effect of later tectonic alteration. We analyzed the Cenozoic Prototype of the Qaidam Basin in northern Tibetan Plateau based on the above workflow. The result shows that the change of sedimentary patterns of the Qaidam Basin over time was closed related to the activities of the Altyn Tagh Fault.


Lin X.,Zhejiang University | Lin X.,University of Western Australia | Lin X.,Research Center for Structures in Oil and Gas Bearing Basins | Chen H.,Zhejiang University | And 7 more authors.
Journal of Geology | Year: 2011

The Haiyuan-Liupan Shan delimits the northeastern margin of the Tibetan Plateau. We present the integrated results of new stratigraphic investigations, apatite fission track analyses, and related thermal history modeling tied to the structural fabric of this region. These constraints provide insight into the timing of northward propagation of the plateau with (1) local relief creation and enhanced erosion in the latest Jurassic to earliest Cretaceous, representing the local element of a complex, regional, far-field deformation response to the Lhasa-Qiangtang collision with the south Asian margin; (2) evidence for likely Late Cretaceous exhumation, but this is uncertain given the regional sedimentary gap that exists across this interval; (3) Eocene relief generation as a first likely response to far-field effects of the India-Asia collision and related to wider regional events recognized in this part of northwestern China; and (4) the latest deformation episode propagating strongly into the Haiyuan-Liupan Shan in the early Miocene, increasing in intensity in the later Miocene and possibly again in the Quaternary. The diachronous nature of the apparent responses to distant plate-boundary events demonstrates that structural preconditioning on its own is inadequate to account for this far-field deformation, suggesting that subcrustal tectonic architecture may play a role in the transfer of stress north of the Tibetan Plateau. © 2011 by The University of Chicago. All rights reserved.

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