Research on provenance and sedimentary facies of Yingcheng Formationin Lower Cretaceous in Longfengshan Subsag,Changling Fault Depression,Songliao Basin

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  • 1.School of Geosciences,China University of Petroleum,Qingdao 266580,China;
    2.Research Institute of Exploration and Development,Northeast Branch Corporation,SINOPEC,Changchun 130062,China

Received date: 2016-07-22

  Revised date: 2016-09-28

  Online published: 2017-01-10

Abstract

Based on the data of cores,logging,seismic and thin-sections,the main source directions of study area in Longfengshan Subsag were confirmed through various evidences including assemblage type of heavy minerals,clastic composition and sandstone-conglomerate content.The sedimentary facies were studied by means of the data and methods of sediment structure,logging response and seismic reflection characteristics.Combined with pale-geomorphology background,synsedimentary faulting and paleoclimatic characteristics,the sedimentary spatiotemporal evolution and influencing factors were confirmed.The result shows that there are three main provenances of Yingcheng Formation,including southwest metamorphic rocks,south neutral-acidic magmatic rocks and southeast magmatic rocks.Based on the provenance systems,the Yingcheng Formation develops sedimentary facies of fan delta and nearshore subaqueous fan.Fan delta facies developed in the shore shallow lake environment which locates between flood-surface and storm wave base.Along the direction of fan-body expanding,debris flow and turbidity current transformed into traction current deposits.As a result of that,fan delta had the characteristic of gravity flow and traction current deposits.Nearshore subaqueous fan facies developed in the semi deep-deep lake which is under the storm wave base.Along the fan-body expanding direction,sliding and slumping gradually transformed into debris flow and turbidity current.The pale-geomorphology showed that the gradient steepened from west to east.Lots of detrital materials from the southeastern,sliding and slumping into lake along steep slope,developed nearshore subaqueous fan.Influenced by synsedimentary fault activity,materials from south and southwest transported by flood accumulated at the fault trough and formed fan delta.Based on the background of damp paleoclimate,seasonal flood provided the power for quick transportation of detrital materials.During the sedimentary period of Yingcheng Formation,sandy conglomerate bodies of fan delta mainly developed at southwest and southern fault trough area.Since the sedimentary period of fifth part of Yingcheng Formation,sandy conglomerate bodies of nearshore subaqueous fan started to deposit at southeast steep slope zone characterized by progradation.The continuous distribution of sandy conglomerate bodies of different facies and adjacent to the mudstone of the semi deep-deep lake facies in the northeast contribute to the favorable source-reservoir relationship.

Cite this article

Yuan Jing,Wang Wei,Zhu Jian-feng,Chen Xing-xia,Zhao Hong-hao . Research on provenance and sedimentary facies of Yingcheng Formationin Lower Cretaceous in Longfengshan Subsag,Changling Fault Depression,Songliao Basin[J]. Natural Gas Geoscience, 2017 , 28(1) : 93 -105 . DOI: 10.11764/j.issn.1672-1926.2016.11.023

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