Mineral composition and brittleness evaluation of shale gas reservoir in the early Cambrian Qiongzhusi formation of Huize area, Eastern Yunnan Province

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Wen, Yiming^1 ; Cheng, Yong^1^2 ; Liu, Cong^1 ; Xia, Jianbo^1 ; Chang, Lantian^3

Mining Engineering Faculty, Kunming Metallurgy College, Kunming, Yunnan

650033, China^1

Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan

650093, China^2

Wuyang Mine, Lu'an Environmental Energy Dev. Co. Ltd., Changzhi, Shanxi

046205, China^3

关键词: Brittleness index;    Early cambrians;    Exploration and development;    Fracturing design;    Fracturing reconstruction;    Mineral composition;    Reservoir fracturing;    Shale gas reservoirs;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/2/012074/pdf
DOI  :  10.1088/1755-1315/295/2/012074

学科分类：环境科学（综合）

来源: IOP

【 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.