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Seismic Deposition in Southwestern Qaidam Basin and Its Implication

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  • 1. China University of Petroleum,Dongying 257061,China; 2. Northwest Branch,Research
    Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China

Received date: 2009-05-26

  Revised date: 2009-08-18

  Online published: 2010-04-10

Abstract

Earthquakes occured overmuch and seismites developed in southwestern Qaidam basin. The seismites made serious seismic-related soft-sediment deformation structures,including pillow structure,ball structure,pillow bed,liquefied sand-stone vein,liquefied mudstone vein,micro-fault,micro-fracture,micro corrugated lamination and sandstone fungus. Seismites can be subdivided into many types,such as seismic corrugated rock,shattered rock,seismic collapse rock,autoclastic breccias,intraclastic parabreccia,liquefied breccia and seismoturbidite rock. Earthquakes made a great amount of micro fractures connecting with original pores of the rocks,therefore greatly improved the storage and permeability of reservoirs. Also earthquakes made fractures penetrating interleaved sand and mud beds. These provide a direction to find high permeability reservoirs in low permeability rocks near earthquake rift systems. The lithologic trap,constituted of the updip sand of the underwater distributary channel,mouth bar of the delta front,the beach bar sand of the mere and shore in seismic faulted system,will be a new exploration territory of lithologic reservoir in southwestern Qaidam basin.

Cite this article

CHEN Wu-Jie, YUAN Jing, LI Gong-Zhe, CAO Zheng-Lin, ZHANG Wei, FAN Hai-Lin- . Seismic Deposition in Southwestern Qaidam Basin and Its Implication[J]. Natural Gas Geoscience, 2010 , 21(2) : 230 -237 . DOI: 10.11764/j.issn.1672-1926.2010.02.230

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