Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 46-55.doi: 10.12108/yxyqc.20190206

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Sedimentary evolution characteristics of E32 carbonate rocks in Yingxi area,Qaidam Basin

YI Dinghong1, WANG Jiangong1,2, SHI Lanting1, WANG Peng3, CHEN Juan1, SUN Songling1, SHI Yajun1,2, SI Dan3   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
    3. PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China
  • Received:2018-08-15 Revised:2018-11-03 Online:2019-03-21 Published:2019-03-21

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Abstract: In recent years,great breakthroughs have been made in oil and gas exploration of lacustrine carbonate rocks in the upper member of Xiaganchaigou Formation (E32) of the Paleogene Oligocene in Yingxi area of Qaidam Basin,showing a reserves scale of 100 million tons. In order to evaluate next hydrocarbon exploration targets in Yingxi area,based on core observation and analysis of drilling and logging data,combined with geochemical parameters such as MnO/Fe,Sr/Ba,carbon and oxygen isotopes and thin section identification,the sedimentary evolution characteristics of lacustrine carbonate rocks were studied. The results show that carbonate rocks in Yingxi area mainly developed in the lower and middle part of E32,which interbedded with gypsum-salt rocks or terrigenous clastic rocks and mainly distributed in the sedimentary center of lacustrine basin,thinning towards the margin of the basin and transforming into terrigenous clastic rocks or gypsum-salt rocks. The carbonate rocks in Yingxi area were characterized by mixed sedimentary origin,complex mineral composition and diverse lithology,and formed in closed saline water environment under arid climate,and water salinity is the main controlling factor of lithological change and development degree. This research can provide a geological basis for defining the reserves scale in Yingxi area.

Key words: carbonate rock, sedimentary environment and evolution, saline lacustrine basin, upper member of Xiaganchaigou Formation, Yingxi area

CLC Number: 

  • TE122
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