LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 211-217.doi: 10.3969/j.issn.1673-8926.2015.05.034

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Reservoir characteristics and controlling factors of deep diamictite in Yingxi area, Qaidam Basin

Chen Dengqian, Shen Xiaoshuang, Cui Jun, Lu Yanping, Huang Yao   

  1.  Research Institute of Exploration and Development , PertoChina Qinghai Oilfield Company , Dunhuang 736202 , Gansu , China
  • Online:2015-09-26 Published:2015-09-26

Abstract:

Based on the classification method of diamictite proposed by Zhang Xionghua, the lithology of deep diamictite in Yingxi area of Qaidam Basin was classified simply into three types: carbonatite, mudstone and sandstone. The data of thin section, whole rock mineral analysis, nuclear magnetic resonance and core porosity were used to study the reservoir characteristics of deep diamictite in Yingxi area. The main rock type of the reservoir is micrite limestone(dolomite), and the minerals include terrigenous minerals, carbonate minerals and clay minerals. The porosity ranges from 0.58% to 8.58%, with the average value of 2.69%, and the permeability ranges from 0.010 mD to 0.501 mD, with the average value of 0.053 mD. The reservoir has the characteristics of low porosity and low permeability, and the correlation between the two parameters is poor. The reservoir spaces mainly include intergranular pores and fractures, with fewer dissolved pores. The content of carbonate minerals and compaction are the main controlling factors for reservoir properties.

Key words: wavelet extraction of cepstrum domain, spectral balance technology, wavelet deconvolution keeping bandwidth consistant, prestack raising resolution processing

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