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Sequence framework of two different kinds of margins and their response to tectonic activity during the Middle-Late Triassic,Ordos Basin

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Science China Earth Sciences 2007年第Z2期50卷 203-216页

作者： YANG MingHui LIU ChiYang ZHENG MengLin LAN ChaoLi TANG Xuan Key Laboratory for Hydrocarbon Accumulation of Education Ministry in China University of Petroleum Basin and Reservoir Research CenterChina University of PetroleumBeijing 102249China State Key Laboratory of Continental Dynamics(Northwest University) Xi'an710069China Exploration&Production Research Institute SINOPECBeijing 100083China School of Engineering of Oil&Gas China University of PetroleumBeijing 102249China School of Energy China University of GeosciencesBeijing 100083China

Two kinds of margin respectively occur in the Ordos Basin during the Middle-Late Triassic(Yanchang Age),one is foreland margin developed under the background of flexural subsidence by thrusting intensively in the southwest margin,and the other is intracratonic basin margin by stable subsidence in northern and central parts of the *** Middle-Late Triassic Yanchang Formation can be divided into four regional third-order sequences,which are separated by gentle angular unconformity or regional erosion surface,made up of lowstand system tract(LST),expanding system tract(EST)and highstand system tract(HST)from lower to upper within a *** there are distinct differences of the sequence framework between the southwest margin and northern and central parts of the *** southwest margin develops heavy conglomerate layer and unconformity as a result of orogeny by thrusting,and the intracratonic basin margin by stable subsidence in the northern and central parts grows aggradational sandstone,conglomerate in fluvio-delta system and parallel *** depositional framework of southwest margin reflects the tectonic evolution from flexural subsidence by thrusting to rebounded *** formation of sequence boundary is related to the resilient uplift and *** sequence stratigraphic framework and depositional system tract configuration in the foreland basin are controlled by structural activity of the fold and thrust belt,and the sequence succession reflects episodic thrusting of the Middle-Late Triassic toward the foreland *** sequence evolution in northern and central parts reflects the depositional succession of fluvio-delta system under intracratonic background,composed of coarse-grained sediment in braided channel deposit at the lower,meandering channel deposit in the middle and fine-grained sediment in the flood plain at the upper,dominated by lake level *** the deposit of the LST in the intracraton basin,accommodation spa

关键词： sequence architecture tectonic response basement structure the Middle-Late Triassic(Yanchang Age) Ordos Basin

Structural Characteristics of the basement beneath Qiangtang Basin in Qinghai-Tibet Plateau: Results of Interaction Interpretation from Seismic Reflection/Refraction Data

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维普期刊数据库

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Acta Geologica Sinica(English Edition) 2013年第2期87卷 358-377页

作者： LI Qiusheng GAO Rui FENG Shaoying LU Zhanwu HOU Hesheng GUAN Ye LI Pengwu WANG Haiyan YE Zhuo XIONG Xiaosong LIU Jinkai HE Rizheng Institute of Geology CAGS Earthprobe and Geodynamics Open Laboratory of CAGS The Geophysical Exploration center CEA East China Petroleum Geology Bureau China Petrochemical Corporation

The studies on configuration, character/property of the basement of Qiangtang basin is helpful for evaluating petroleum and nature gas resources as well as understanding the basin evolvement. Recently a moderate to high-grade metamorphic gneiss rock was found underlying beneath very low metamorphic Ordovician strata in Mayer Kangri to the north of the central uplift. That fact actually proved existence of the crystalline basement just the distribution and structures of pre-Paleozoic crystalline basement still remain puzzle. In recent years a number of active sources deep seismic profiling, to aim at lithospheric structure of northern Tibet and petroleum resources of the Qiangtang basin, had been conducted that make it possible to image the structure of the basement of the Qiangtang. Near vertical reflection profiles, included those acquired previously and those during 2004 to 2008, have been utilized in this study. By through the interaction process and interpretation between the reflection profiles and the wide-angle profile, a model with the detailed structure and velocity distribution from surface to the depth of 20 km of Qiangtang basin has been *** on the results and discussions of this study, the preliminary conclusions are as follows：（1） The velocity structure section （~20 kin） that is interactively constrained by the refraction and reflection seismic data reveals that the sedimentary stratum gently lie until 10 km in the south Qiangtang basin. （2） The basement consists of fold basement （the upper） and crystalline basement （the lower）.The fold basement buried at the average depth of 6 km with a velocity of 5.2-5.8 km/s. The shallowest appear at range of the central uplift. The crystalline basement is underlying beneath the fold basement at the average depth of 10 km with a velocity of 5.9-6.0 km/s except near Bangong-Nujiang suture. （3） The high-velocity body at the depth range of 3-6 km of the central uplift is considered as a fragment of the cryst

关键词： seismic reflection seismic refraction basement structure Qiangtang basin Qinghai-TibetPlateau

Ray hit analysis method and its application to complex upper crustal structure survey

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Acta Seismologica Sinica(English Edition) 2006年第2期19卷 173-182页

作者：徐朝繁张先康张建狮胡修奇 Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002 China Earthquake Administration of Henan Province Zhengzhou 450000 China

Based on the results obtained from Pg wavefront imaging in active source deep seismic sounding, we propose a new ray hit analysis method for high-resolution seismic refraction profile data processing. This method can be used to further determine possible refraction interface, especially spatial location of basement and its pattern characteristics in complex upper crustal structure region, making data processing for high-resolution refraction profiles more fine. We use this method to study the crystalline basement structure of east part of A＇nyemaqên suite zone at northeast side of Qinghai-Xizang Plateau and the basement patterns as well as its spreading features at the east part of Anemaqen suite zone and its adjacent region were determined.

关键词： high-resolution refraction ray hit analysis A'nyemaqên suite zone basement structure

Structural characteristics of the basement and the prospective of favorable oil and gas blocks in the Tacheng basin

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Earthquake Science 2012年第5期25卷 527-534页

作者： Guoqing Zhang Junmeng Zhao Hua Bai Ming Wan Xiaoyang Guo Research Institute of Exploration and Development Xinjiang Oilfield CompanyPetroChina Institute of Tibetan Plateau Research Chinese Academy of Sciences

The Tacheng basin has been identified as a Carboniferous basement with a central uplift, sur- rounded by orogenic belts. This identification was based on the comprehensive analysis of field outcrops, regional magnetic and gravimetric data, skeleton seismic profiles, magnetotelluric profiles and drilling data. Here, we present gravimetric and magnetic data analyses of the basement structures of the Tacheng basin and its base formation. We also provide a magnetotelluric profile analysis of the structural features and tectonic framework of basin-mountain patterns. We use local geology, drilling data, and other comprehensive information to document the tectonic framework of the basement of the basin. Small-scale nappe structures are found in the northern basin, whereas stronger and more pronounced thrusting structures are found to the south and east of the basin. The basin is divided into four first-order tectonic units： a central uplift, a northern depression, a southeastern depression and a western depression. In addition, the Emin sag is suggested as a possible reservoir for oil and gas.

关键词： northern Xinjiang Tacheng basin basement structure basin and mountain relation-ship tectonic unit division favorable area

Palinspastic reconstruction and geological evolution of Jurassic basins in Mongolia and neighboring China

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Journal of Palaeogeography 2013年第3期2卷 306-317页

作者： Wu Genyao Institute of Geology and Geophysics Chinese Academy of Sciences

The important event in Jurassic tectonics in Mongolia was the subduction and closure of the Mongolia-Okhotsk ocean;correspondingly,basin evolution can be divided into two main stages,related to the orogeny and collapse of the orogenic belt,*** developing of Early-Middle Jurassic basins to the north of the ocean resulted from back-arc *** fossil sutures,from the China-SE Asia sub-continent to the south of the ocean,were rejuvenated by subduction-related orogeny;in addition,the Yanshanian intra-continental movement *** Early-Middle Jurassic molasse basins were developed by movement in Inner Mongolia,all of which stretched westwards (or northwards) into Mongolia;therefore,the molasse basins in eastern and southern Mongolia had the same geometric and kinematic features as the basins in the Inner *** to the collapse of the MongoliaOkhotsk orogenic belt,a group of rift basins developed during the Late *** eastern Mongolia,the NE orientated extensional basins were controlled by the neogenic *** contemporary basins in southern Mongolia and the neighboring areas in China were constrained by remobilization (inherited activation) of the latitudinal or ENE-directional basement *** stages can be recognized in the evolution of the Early-Middle Jurassic basins after reversal;the basins also experienced four episodes of reformation.

关键词： back-arc extension molasse basin collapse rift basin evolution basement structure neogenic structure Jurassic Mongolia and neighboring China