Open AccessEvolution of H-O isotopes from fracturing flowback fluids for shale gas wells: A case study in Chongqing, China
Author(s) -
Haijie Zhang,
Gaowei Xu,
Yuanping Luo,
Wei-Ming Chen,
Chun-Bi Xu,
Hui Xiao
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/784/1/012001
Subject(s) - oil shale , meteoric water , shale gas , isotopes of oxygen , geology , isotope , stable isotope ratio , geochemistry , hydrogen , petroleum engineering , mineralogy , chemistry , groundwater , geotechnical engineering , quantum mechanics , paleontology , physics , organic chemistry
The hydrogen and oxygen isotopes of the fracturing flowback fluids from 3 wells in the Longmaxi Formation in Dazu area of western Chongqing, China provides insights into the source of the flowback fluids. We use the valued of δ 2 H and δ 18 O, combined with concentrations of ions to discuss the changing rule of H and O isotopes throughout the flowback period. The values of δ 2 H and δ 18 O for Z2 and Z5 wells show different changing trends. But he values of δ 2 H and δ 18 O for Z2 and Z5 wells have similar changing trends. There is no obvious correlation between hydrogen and oxygen isotopes for 3 wells. The fracturing fluids, formation brines, meteoric water, and water-rock reaction can change the H and O isotopes for flowback fluids from shale gas wells.