Geological Conditions of Deep Gas Pools and Their Favorable Prospects
Received date: 2009-09-22
Revised date: 2009-10-05
Online published: 2009-12-10
The northern margin of the Qaidam basin has the geological conditions for forming deep gas pools.The Lower and Middle Jurassic source rocks are extensive in the margin, with buried depth ＞4 500 m and RO＞1.3％.There developed the Lower and Middle Jurassic delta, fan delta, underwater fan, lake shore sand bodies and Tertiary fluvial fan, river plain, braid river delta and lake shore to shallow lake sand bodies.There are two regional seals, the Lulehe formation (E1+2) and Xiaganchaigou formation (E23).Buried structures,giant anticlines, structural and lithological traps around ancient uplifts are found.The gas generation of the Northern margin of the Qaidam basin was late, and it matched the histories of trap formation, reservoir\|cap development and fault development and was favorable for pool formation and preservation.The risk of the deep gas exploration in the Qaidam basin is that it is difficult to determine the gas generation potential and distribution area as well as the preserved ability of deep reservoirs.The deep buried structures,the Lenghu structural belt and the Erboliang\|Yikeyawuru structural belt can be considered as the most favorable targets of deep gas exploration.On a long view, the two wings of the Lenghu structural belt and the structural lithological traps around the Nanbaxian ancient uplift are exploratory targets.
Key words： Deep gas pool; Formation condition; Prospect; Northern Qaidam basin.
FU Suo-tang,WANG Li-qun,Xu ZI-yuan,MA Li-xie,ZHANG Xiao-bao . Geological Conditions of Deep Gas Pools and Their Favorable Prospects[J]. Natural Gas Geoscience, 2009 , 20(6) : 841 -846 . DOI: 10.11764/j.issn.1672-1926.2009.06.841
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