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The structural accumulation mechanism of the natural gas hydrates in Muli region of Qinghai Province:Revelation from physical simulation experiment

Wu Chuang1,Yin Hong-wei1,Yu Chang-qing2,Pi Jing-yun2,Wu Zhen-yun3,Wang Wei1,Zhang Jia-xing1   

  1. 1.School of Earth Science and Engineering,Nanjing University,Nanjing 210023,China;
    2.Institute of Geology,Chinese Academy of Geological Science,Beijing 100037,China;
    3.Jiangsu Earthquake Administration,Nanjing 210014,China
  • Received:2016-11-30 Revised:2017-03-30 Online:2017-05-10 Published:2017-05-10

Abstract:

The Muli region of Qinghai Province,where natural gas hydrates were drilled and discovered in 2008,has attracted more and more attention.Taking the Juhugeng mining area as an example,drilling data and fracture distribution characteristics of the Muli region show that the distribution of natural gas hydrates accumulation has certain regularity.Natural gas hydrates are mostly distributed near a pre-existing major regional fault F1.While in the adjacent areas,no natural gas hydrates formed although these areas have similar physical and chemical condition.Based on the previous studies,combining with regional geologic and structural characteristics,we designed and ran three groups of physical sandbox experiments.We try to illustrate a possible structural mechanism and influencing factors of the accumulation pattern of natural gas hydrates in our research region.Modeling results show that the combination of pre-existing fault and detachment layer has a controlling role on structural deformation of the Muli region.Pre-existing fault is a major regional fault,which reactivates under the later regional shortening,and forms a migration channel by cutting strata from the deep strata to the shallow strata.The distribution of the regional detachment layer causes the wide development of the thin-skinned faults under the later regional shortening.These fault roots mainly located at the regional detachment layer,and nearly no faults cut through the strata under the detachment layer.By analyzing physical experimental results and the structural patterns,and the distribution characteristics of the natural gas hydrates in the research area together,we propose a possible structural accumulation pattern of natural gas hydrates in the Muli region.In this area,the natural pyrolysis gas,migrating along the fractures caused by the major regional pre-existing fault,generated in the deep strata and accumulated in the shallow strata where the favorable physical and chemical conditions can be provided.While in the other places far away from the major regional fault in the research area,no natural gas hydrates can be accumulated in the shallow strata,because the deep migration channel developed unconditionally due to the lack of major regional fault rooting to the gas source region in the deep strata.

Key words: Natural gas hydrate, Pre-existing fault, Detachment layer, Muli area, Physical simulation

CLC Number: 

  • TE122.1
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