T67 Unconventional Energy Resources: Advances and Evolution in Tight Reservoir Assessment and Production (Posters)

Sunday, 22 October 2017
9:00 AM - 5:30 PM
Halls 4EF

DISTRIBUTION CHARACTERISTICS OF BENTONITE IN THE WUFENG-LONGMAXI SHALES AND ITS EFFECT ON SHALE RESERVOIR QUALITY

Paper number: T67-6
Program: Technical Sessions
Time: 9:00 AM – 5:30 PM

Authors

  • Yi Shu Presenting Author
    China University of Geosciences ( Wuhan), wuhan
  • Jingyu Zhang
    China University of Geosciences ( Wuhan), wuhan
  • Huawu Mao
    China University of Geosciences ( Wuhan), wuhan
  • Dingkun Lei
    China University of Geosciences ( Wuhan), wuhan

Abstract

This study focuses on the characteristics of the bentonite distribution within the Wufeng-Longmaxi Formation marine black shale in the Fuling area, Sichuan Basin, hence to explore the interrelation between the bentonite layers and the shale reservoir quality. Analysis regarding the development of petrophysical characteristics, shale reservoir quality and development mechanism of heterogeneous reservoir quality was carried out based on detailed core description, whole rock / clay X-ray diffraction analysis, argon ion polishing scanning electron microscopy and etc. The result shows that there are totally 42 sets of bentonite interlayers within the Wufeng Formation and lower Longmaxi Formation in the study area. We classified the strata containing bentonite layers into dense interval, sparse interval and scarce interval according to the thickness of the bentonite layers and the thickness of interlayers. By comparing the characteristics of the shale reservoir quality in different intervals, it is realized that the sparse interval is of high brittle mineral, high organic carbon content and high gas content, thus being the most favorable shale section within the reservoir. Further analysis on paleo-redox conditons and primary productivity suggest that discrete volcanic eruptions might conduce to the changes of the redox conditions during the deposition. And the moderate volcanic activity is beneficial to the enrichment of organic matter and siliceous minerals, which also favors the formation of advantageous shales.

Geological Society of America Abstracts with Programs. Vol. 49, No. 6

doi: 10.1130/abs/2017AM-301159

© Copyright 2017 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.