标题：Mineral composition and brittleness evaluation of shale gas reservoir in the early Cambrian Qiongzhusi formation of Huize area, Eastern Yunnan Province
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：295
期号：2
页码：1-7
DOI：10.1088/1755-1315/295/2/012074
出版社：IOP Publishing
摘要：The brittleness of shale gas reservoir determines the effect of fracturing reconstruction, which is of great significance for improving shale productivity. The study of shale brittleness evaluation can provide basic data for fracturing design. The mineral composition characteristics of shale gas reservoir in the early Cambrian Qiongzhusi formation of Huize area, Eastern Yunnan Province are reported in this paper, and the brittleness is evaluated according to the proportion of brittle minerals in total minerals. The results show that the mineral composition of the reservoir is complex. After comparing the brittleness index calculated by different formulas, it is considered that the minerals with high young's modulus and low poisson's ratio should be considered as brittle minerals, which is conducive to the universality of the brittleness index formula and the objectivity of reservoir brittleness evaluation. Shale gas reservoir of Qiongzhusi formation is obviously divided into two sections: the layers of 1 to 7 with a large brittleness index (77.60% on average) on the lower part are beneficial to reservoir fracturing reconstruction, while the layers of 8 to 14 with a small brittleness index (37.78% on average) on the upper part are not conducive to reservoir fracturing reconstruction. This study is conducive to guiding further exploration and development of shale gas in the research area.
