基于经验模态分解和能量熵判别的火成岩岩性识别方法——以春风油田石炭系火成岩储层为例

doi:10.11743/ogg20180413

Abstract

Abstract: Igneous reservoirs are characterized by diversity of eruption patterns and lithology geneses,and variation in mineralogy assemblage.It is really difficult to identify lithology in details,which in turn will greatly hinder the correct calculation of reservoir parameters,as well as subsequent hydrocarbon development strategies.Therefore,the study took a case study of the carboniferous igneous reservoirs in Chunfeng oilfield,Junggar Basin.The lithological categories of the reservoirs are basalt,basaltic andesite,andesite,tuff and volcanic breccias.A combination of core,thin section and other tests' data were used in the study.Then the logging response characteristics of different lithologies were clarified.The tuff and volcanic breccia were identified with the cross plot technique and "progressive stripping" concept.For the hard-to-identify volcanic lava,we used the empirical mode decomposition algorithm to convert the conventional logging data into multiple band sets of intrinsic mode functions,and attained the energy entropy of empirical mode function of various logging parameters for lavas.Then the precise identification of igneous lithologies was realized by using the discriminant algorithm.In applying the method to the block, we found that the overall matching rate of the proposed method is 93.7%, which has greatly improved the accuracy of lithological identification.

Key words: empirical mode decomposition, energy entropy, lithology identification, igneous rock, Chunfeng oilfield

CLC Number:

TE122.2

Han Yujiao, Yuan Chao, Fan Yiren, Ge Xinmin, Fan Zhuoying, Yang Wenchao. Identification of igneous reservoir lithology based on empirical mode decomposition and energy entropy classification: A case study of Carboniferous igneous reservoir in Chunfeng oilfield[J]. Oil & Gas Geology, 2018, 39(4): 759-765.

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Identification of igneous reservoir lithology based on empirical mode decomposition and energy entropy classification: A case study of Carboniferous igneous reservoir in Chunfeng oilfield

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