Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (2): 114-118.doi: 10.3969/j.issn.1673-8926.2016.02.016

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Quantitative lithology identification technology of complex sand-conglomerate bodies#br#

Wu Zhaohui 1，2， Xu Shouyu1， Liu Xilei2， Wu Yinghao1， Song Honglin3， Niu Lijuan2   

  1.  1. School of Geosciences ， China University of Petroleum ， Qingdao 266580 ， Shandong ， China ； 2. Research Institute of Exploration and Development ， Shengli Oilfield Company ， Sinopec ， Dongying 257015 ， Shandong ， China ； 3. Technology Inspection Center ， Shengli Oilfield Company ， Sinopec, Dongying 257000 ， Shandong ， China
  • Online:2016-03-20 Published:2016-03-20

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Abstract:

The lithologies of complex sand-conglomerate bodies are various, and effective lithology identification method is still lacked. Through comparing many lithologies and well logging data, a new quantitative lithology identification technology was formed. Near source sand-conglomerate bodies in CH Oilfield were taken as the study case. Firstly, some lithologies were accurately identified with cores, grain size and cast slice data, and the critical log values of key lithologies were determined based on cross plots. Secondly, sandstone, conglomerate, and sandy conglomerate were identified with the array induction log curve. Thirdly, sandstone, conglomerate, muddy sandstone and muddy conglomerate were further identified with the density log curve. Finally, limy sandstone and limy conglomerate were identified with the critical values of three-porosity curves （DEN, AC, CNL） and wave impedance log curve, and altogether 7 kinds of lithologies were identified in complex sand-conglomerate bodies. Judging from the results, the correct rate is more than 75%.

Key words: geometry compensation , offset regularization , gather muting , amplitude preserved processing , pre-stack inversion

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