Optimal selection and application of prediction means for organic carbon content of source rocks based on logging data in Yanchang Formation,Ordos Basin

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  • 1.Key Laboratory of Petroleum Resources of Gansu Province/Key Laboratory of Petroleum Resources
    Research of Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Geophysical Research Institute,BGP,CNPC,Zhuozhou 072750,China

Received date: 2015-09-04

  Revised date: 2015-10-28

  Online published: 2019-09-20

Abstract

Although the prediction of total organic carbon content (TOC) of hydrocarbon source rocks with well logging data has obvious advantages,due to special characteristics of different regions and strata,the prediction error has limited the wide application of this method.According to the previous prediction means for hydrocarbon source rock TOCcontent of natural gamma ray logging,bulk density log,multiple regression analysis and BP neural network model,combined with the geological characteristics of Yanchang Formation in Ordos Basin,the empirical formulas and models of TOC content prediction for the study area were established.BP model is considered as the best method to predict the TOC content in the study area.According to the application of BP model  in Well YK1 in southern Ordos Basin,the TOC value of 9 220 sample points were obtained,effective source rocks of 4 segments located at Chang19,Chang37,Chang27 and Chang17,respectively were recognized,and Chang27-Chang37 is the best segment with highest TOC content.These effective hydrocarbon source rocks developed oil shales in different degrees,and the predicted TOC content value in the same stratum from different wells in different regions may be significantly different,which is consistent with the distribution of the sedimentary facies of the ancient lake during different depositional stages of Yanchang Formation.

Cite this article

He Cong, So Ao, Zhang Ming-zhen, Wu Yuan-dong, Ji Li-ming . Optimal selection and application of prediction means for organic carbon content of source rocks based on logging data in Yanchang Formation,Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(4) : 754 -764 . DOI: 10.11764/j.issn.1672-1926.2016.04.0754

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