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علوم نفت 2013
جزئیات رویداد
اینستاگرام تی پی بین
همایش ، رویداد ، ژورنال
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  • geophysical investigations of crust-scale structural model of the qiongdongnan basin, northern south china sea

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1208
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     rifting of the qiongdongnan basin was initiated in the cenozoic above a pre-cenozoic basement, which was overprinted by extensional tectonics and soon after the basin became part of the rifted passive continental margin of the south china sea. we have integrated available grids of sedimentary horizons, wells, seismic reflection data, and the observed gravity field into the first crust-scale structural model of the qiongdongnan basin. many characteristics of this model reflect the tectonostratigraphic history of the basin. the structure and isopach maps of the basin allow us to reconstruct the history of the basin comprising: (a) the sediments of central depression are about 10 km thicker than on the northern and southern sides; (b) the sediments in the western part of the basin are about 6 km thicker than that in the eastern part; (c) a dominant structural trend of gradually shifting depocentres from the paleogene sequence (45–23.3 ma) to the neogene to quaternary sequence (23.3 ma–present) towards the west or southwest. the present-day configuration of the basin reveals that the cenozoic sediments are thinner towards the east. by integrating several reflection seismic profiles, interval velocity and performing gravity modeling, we model the sub-sedimentary basement of the qiongdongnan basin. there are about 2–4 km thick high-velocity bodies horizontal extended for a about 40–70 km in the lower crust (v > 7.0 km/s) and most probably these are underplated to the lower stretched continental crust during the final rifting and early spreading phase. the crystalline continental crust spans from the weakly stretched domains (about 25 km thick) near the continental shelf to the extremely thinned domains (<2.8 km) in the central depression, representing the continental margin rifting process in the qiongdongnan basin. our crust-scale structural model shows that the thinnest crystalline crust (<3 km) is found in the changchang sag located in the east of the basin, and the relatively thinner crystalline crust (<3.5 km) is in the ledong lingshui sag in the west of the basin. the distribution of crustal extension factor β show that β in central depression is higher (>7.0), while that on northern and southern sides is lower (<3.0). this model can illuminate future numerical simulations, including the reconstruction of the evolutionary processes from the rifted basin to the passive margin and the evolution of the thermal field of the basin.

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