Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (5): 89-96.doi: 10.3969/j.issn.1673-8926.2017.05.010

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Identification of Ordovician karstic paleochannels and its accumulation significance in Halahatang area

DAI Dongdong1, FANG Qifei1, WAN Xiaoguo2, CAI Quan2   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. Research Institute of Exploration & Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China
  • Received:2017-02-17 Revised:2017-03-29 Online:2017-09-21 Published:2017-09-21

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Abstract: The paleo-karst landforms formed in the Ordovician Lianglitage Formation after the deposition of carbonate rocks in the Halahatang area,which is favorable for the formation of high-yielding hydrocarbon reservoirs, but its complexity brings high exploration risk. The seismic,drilling and logging data were applied to optimize the automatic identification of riverbed erosion depth,RGB mixing three primary colors,amplitude attribute extraction and seismic reflection structure analysis,and six groups of river channel and 47 underground river channels in the Ordovician carbonate rocks were identified. The study shows that the reservoir is closely related to the underground river system,and there are three types of underground river system including inflow,outflow and aquifer cave,and the former two types are predominant. This underground river system is the main mechanism of the formation of large-scale fractured-vuggy reservoirs,and it is also the foundation for the large-scale hydrocarbon enrichment areas. The reservoirs with this genesis become the key targets of exploration and development. This identification method of carbonate karstic paleochannels is significant for favorable reservoir prediction, hydrocarbon enrichment area optimization,exploration and development in paleo-karst area.

Key words: low permeability sandstone, pore structure, micropore characteristics, mercury injection curve, nuclear magnetic resonance, Dongying Sag

CLC Number: 

  • TE132.1
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