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
Article Information
Identifiers and Pagination:
Year: 2017Volume: 10
First Page: 134
Last Page: 142
Publisher Id: TOPEJ-10-134
DOI: 10.2174/1874834101710010134
Article History:
Received Date: 01/06/2016Revision Received Date: 06/12/2016
Acceptance Date: 16/01/2017
Electronic publication date: 26/05/2017
Collection year: 2017
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.
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.
