Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1620-1630.doi: 10.13278/j.cnki.jjuese.201706102

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Characteristics of Ordovician Weathering Crust Reservoir in Yichuan-Huanglong Area, Southeastern Ordos Basin

Tian Ya1, Du Zhili1, Liu Baoxian2, Du Xiaodi1, Chen Yi1   

  1. 1. Oil & Gas Survey, China Geological Survey, Beijing 100029, China;
    2. Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi'an 710018, China
  • Received:2017-03-07 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Support by Project of National Oil and Gas Resources Survey and Strategic Selections, Ministry of Land and Resources (1211302108023)

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Abstract: The authors found the indicative characteristics of paleokarst reservoir in Yichuan-Huanglong area in the southeastern Ordos basin, after a comprehensive analysis combining with seismic, well logging, and core data. The core data demonstrate that the reservoir rocks are mainly gypsum-bearing dolomite and secondary limestone; the reservoir spaces are vugs in dolomite, relatively isolate caves,and fractures; the reservoirs are tight,the porosity varies from 0.30% to 11.54%,with an average of 3.90%, and the permeability varies from 0.002×10-3 μm2 to 15.450×10-3 μm2,with an average of 0.710×10-3 μm2. Reservoir quality is affected by bedded karstification. The comprehensive analysis was further conducted based on paleo-geomorphology, depositional facies,and fractures. The results suggest that the western area of the Ordovician platform in Yichuan is a favorable target for exploration and development due to its high position in the paleo structure and bedded karstification in the reservoir.

Key words: Ordos basin, Ordovician, Majiagou Formation, bedded karstification reservoir

CLC Number: 

  • P618.13
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