RESEARCH ARTICLE


Calcareous Interlayer Causes and Logging Identification for the Shawan Formation of the Chunfeng Oilfield



Qingjie Hou1, *, Qiang Jin1, Weizhong Li2, Lamei Lin1, Wenmin Jiang3, Wenjie Han2
1 School of Geosciences, China University of Petroleum, No.66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, P.R. China
2 Research Institute of Geological Science, Sinopec Shengli Oilfield Company, Dongying, Shandong 257017, P.R. China
3 Guangzhou Institute of Geochemistry,Chinese Academy of Sciences, Guangzhou, Guangdong 510000, P.R. China


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© Hou 2017 et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Geosciences, China University of Petroleum, No.66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, P.R. China, Tel: 8618678679199; E-mails: houqingjie87@163.com, b13010021@s.upc.edu.cn


Abstract

Background:

Many sets of calcareous interlayers are present in the Shawan Formation in the Chunfeng oilfield, which leads to scattered residual oil that is difficult to extract.

Objective:

Observations of core samples and thin sections, analyses of trace element compositions and interpretations of logging data were used to identify the calcareous interlayers and identify their possible origin.

Method:

First, the petrologic characteristics of the calcareous interlayers were identified; then, we developed a quantitative function for identifying the calcareous interlayers based on well log data. Finally, the possible origin of these calcareous interlayers was identified based on these findings.

Conclusion:

The results show that the quantitative function has a high accuracy of 91.8% and average uranium content of calcareous interlayers can reach as high as 27×10-6, indicating that the quantitative identification function provided accurate identification of the calcareous interlayers, and highly radioactive uranium is one explanation for the origin of the calcium cementation.

Keywords: Calcareous interlayers, Logging identification, Calcareous cement, Shawan Formation.