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Overprint of neotectonism along the course of River Chel,North Bengal,India

Journal of Palaeogeography 2016年第3期5卷 221-240页

作者： Sunipa Mandal Subir Sarkar Department of Geological Sciences Jadavpur University

This paper aims to unveit neotectonic imprints in topography, drainage and sediments in the 46.25 km tong course of the River Chet from its source down to its attuvial fan at the base of the Himatayan Mountain Front in the Darjeeting-Jatpaiguri districts of India. A semi-circutar ridge detimits its primary catchment. Within confinement of this watershed basin the drainage pattern is composite being convergent atong the periphery and divergent on a butte inside. AtE these geomorphic neotectonic imprints are accom- panied by ramp and fiat structures and spectacutar mytonitization of rocks. High hypsometric index and convex shape of the hypsometric curve derived from the centrat near-straight course of the river between the primary catchment and the Main Frontat Thrust （MFT） atso reftects tectonic youthfutness of the river course. It is wett manifested atso in widety variabte stream index and stream gradient index ratios （SL/K） often exceeding 2. In response to neotectonism, this river course as a whore shifted westward between 1962 and 2007. Maximum reduction of the stream gradient on top of the MFT is etoquent enough about recent uptift of the thrust ridge. The high average stope gradient of canyon watt about 45.68° is wett consistent with this uptift. Very tow channet-width/vaUey-height ratio along the river further corroborates the uptift. The attuviat fan system of the River Chet is comprised of five morphogenetic fans stacked one above another with a tendency to shrink and shift progressively upstope. They differ from each other in terms of titt, axiat orientation, primary depositionat surface gradient and convexity in transverse section and thus present a writ of ongoing tectonism. Progressive upward increase in the share of distat crystattine rocks in ctast composition within attuviat fan package is a dear proxy for southerty advancement of the MFT. Concomitant increase in maximum ctast size is in good agreement with sediment source uptift. Art the five fans

关键词： Uptift of Main Frontat Thrust neotectonism Hypsometric index Stream-sradient index,Atluviat fan system evotution Fan attributes Ctast size and composition

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Late-stage rapid accumulation of the PL19-3 giant oilfield in an active fault zone during neotectonism in the Bozhong depression,Bohai Bay

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Science China Earth Sciences 2011年第3期54卷 388-398页

作者： ZOU HuaYao GONG ZaiSheng TENG ChangYu ZHUANG XinBin State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China China National Offshore Oil Corporation Beijing 100027 China

Late-stage is defined here as the period when neotectonism occurred since 5.1 Ma. Most petroliferous basins in China lie in the areas where neotectonism occurred intensively. In recent years, Chinese petroleum geologists have paid much attention to late-stage petroleum accumulation. The PL19-3 giant oilfield is situated where faulting activities occurred violently during neotectonism. To understand the mechanism of lat-stage rapid accumulation, we discussed the most important aspects responsible for the formation of the giant oilfield, including oil generation, active oil-source rock occurrence, fault activity and fault conduits, late-stage rapid oil injection as well as the distinguishing indicators. This study shows that: (1) sufficient oil was supplied to the PL19-3 field since 5.1 Ma because the PL19-3 structure was surrounded by four sags in which three intervals of high-quality source rocks remained active during neotectonism; (2) densely distributed faults and high porosity/permeability sandstone carrier beds comprised the effective conduit system for oil migration and injection; (3) oil migrated along the faults and charged the PL19-3 structure rapidly by means of seismic pumping which was triggered by frequent earthquakes during Neotetonism. It is documented that elevated reservoir temperature, abnormal geothermal gradients and abnormally high homogenization temperatures of the fluid inclusions are the indicators for late-stage rapid oil accumulation.

关键词： neotectonism active oil-source rock (AOSR) migration conduit late-stage rapid accumulation PL19-3 oilfield Bozhong depression

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Late-stage Hydrocarbon Accumulation in the Bozhong Depression of the Bohai Bay Basin as Controlled by neotectonism

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Acta Geologica Sinica(English Edition) 2004年第3期78卷 632-639页

作者： GONGZaisheng ZHANGGongchengt CAIDongsheng HEShibin ChinaNationalOffshoreOilCorporation Beiiing100026 ResearchCenterofChinaNationalOffshoreOilCorporation Beijing100026

neotectonism occurred intensively in the Bozhong depression in the Bohai Bay Basin, which was reflected vertically by dramatic subsidence and a number of uplifts and laterally by notable fault movements. This particularity has resulted in the special petroleum geological conditions of the Bozhong depression which are different from those of adjacent lands. For example, the source rocks of the Shahejie Formation were overpressured and hydrocarbon generation occurred in the late stage; the Dongying Formation was deeply buried below the hydrocarbon-generating threshold, therefore there were sufficient oil sources. The rapid subsidence led to starved sedimentation of the Guantao Formation fine sandstone and the regional Minghuazhen Formation lacustrine shale, which formed the Neogene regional reservoir-caprock association. The active faults formed in the neotectonism became passages for oil to migrate from the Paleogene to Neogene. The traps formed by late fault activity and accompanied anticlines provided spaces for the formation of reservoirs. All the above factors match well with one another in the Bozhong depression, providing favorable conditions for the formation of a series of large oilfields in the region

关键词： Bozhong depression neotectonism late-stage hydrocarbon accumulation Tanlu fault large oilfields

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Control of differential tectonic evolution on petroleum occurrence in Bohai Bay Basin

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Science China Earth Sciences 2014年第4期57卷 1117-1128页

作者： TENG ChangYu ZOU HuaYao HAO Fang State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Key Laboratory of Tectonics and Petroleum Resources Ministry of Education China University of Geosciences

The Bohai Bay Basin(BBB)is the most petroliferous Cenozoic basin in the east of *** consists of seven *** depression has been subjected to different stress states and then has experienced varying faulting processes since the Neogene,especially during the neotectonism(from the Pliocene to the present).On the basis of the investigation of fault patterns,fault densities and fault activity rates(FARs)for each depression,this paper demonstrates the discrepancy of faulting development and evolution across the *** dynamic mechanism for the differences in faulting is also discussed by the analysis of the regional stress *** Bozhong Depression is just situated in the transtensional zone induced by the two active strike-slip faults,namely Yingkou-Weifang and *** this depression,the major faults which cut through the Paleogene or the Cenozoic have had higher than 10 m/Ma FARs since the Neogene,and the highest FARs have reached or exceeded 25 m/Ma during the *** a result,most of the petroleum has migrated along these major faults and accumulated within the *** contrast,in the other depressions of the BBB away from the Bozhong Depression,the FARs of the major faults were decreased to lower than 10 m/Ma since the Neogene,and tended to be zero during the ***,the major faults could not serve as vertical conduits for petroleum migration,and the petroleum was entrapped in the ***,the faulting since the Neogene,especially during the neotectonism,controlled the petroleum richness in vertical strata.

关键词： vertical petroleum occurrence differential regional stress field differential fault activity neotectonism Bohai Bay Ba-sin

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