Lithologic Reservoirs ›› 2008, Vol. 20 ›› Issue (2): 29-36.doi: 10.3969/j.issn.1673-8926.2008.02.005

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Deep crust structur al featur es and new targets of petroleum explor ation in Qaidam Basin

ZHANG Jinglian, SHI Lanting, CHEN Qilin, ZHANG Huquan, WEI Pingsheng   

  1. Research Institute of Petroleum Exploration & Development-Northwest (NWGI) , PetroChina, Lanzhou 730020, China
  • Online:2008-06-15 Published:2008-06-15

Abstract:

Three oil-gas bearing regions have been proved in Qaidam Basin since the 1950’s, including Tertiary oil filed in west, Jurassic oil field in north and the Quaternary gas field in east. It is a problemconcerned by the petroleum geologists where the new targets are for the further exploration. The discoveries of eclogite, ultramafite and gold mine in the periphery of the basin and gypsum-salt, dolomite, illite and strontiummine in the basin indicate the existence of mantle fluid activity. The seismic sounding result shows that low velocity-high conductive layers widely developed in the mid-crust of Qaidam Baisn. The analyses of the relationships between the low velocity-high conductive layers and discordogenic fault, between the fault and the unconformity and between the shallow fault and the reservoir take a significant part in looking for large oil and gas fields. The research shows that the further exploration should be stressed in deep granite and weathered crust in Chaixi area, and the deep of Sanhu area is the favorable target for looking for large gas fields.

Key words: braided river facies, sedimentary microfacies, favorable facies belt, Dagang Oilfield

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