Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 74-81.doi: 10.12108/yxyqc.20180509

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Key techniques for seismic evaluation of lithologic reservoirs in southwestern Qaidam Basin

CHEN Guowen, SHEN Ya, YUAN Yunchao, HAN Bing, LI Yanming, YANG Tai   

  1. Geological Research Center, GRI, BGP Inc., CNPC, Zhuozhou 072750, Hebei, China
  • Received:2017-09-10 Revised:2017-12-20 Online:2018-09-14 Published:2018-09-14

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Abstract: With tremendous remaining oil and gas resources,the southwestern Qaidam Basin is an important area for the exploration of lithologic reservoirs. However,due to the late start of lithologic exploration,the studies on geological settings of hydrocarbon accumulation and the key hydrocarbon accumulation factors are not conducted thoroughly enough,which restricts the progress of lithologic exploration. This paper carried out the research works, such as the identification of geological settings and lithologic traps,comprehensively by enhancing the basic research,the overall understanding and the fine evaluation in recent years focusing on the rich hydrocarbongenerating depressions in western Qaidam Basin. 3D large-area contiguous seismic data from the southwestern Qaidam were used to carry out fine structural interpretation and reservoir prediction. Zhahaquan area was clearly identified as a favorable exploration zone,the favorable zones were delineated,the distribution of high-quality sand bodies were confirmed and the distribution of "sweet" was predicted accurately,and the first 100-millionton level lithologic reservoir reserve area was delineated and verified in Qaidam Basin. Based on the lithologic reservoir exploration practices in Zhahaquan area,a set of evaluation ideas and technical methods applicable for the lithologic reservoir exploration in southwestern Qaidam Basin was formed. This research plays an important guiding role in deepening the lithologic reservoir exploration in southwestern Qaidam Basin.

Key words: lithologic reservoir, exploration ideas, seismic evaluation technology, southwestern Qaidam Basin

CLC Number: 

  • P631.4
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