Origin and Geochemical Characteristics of Dolomites in the Middle Permian Formation,SW Sichuan Basin,China
Han Xiaotao
Bao Zhengyu
Xie Shuyun
Abstract：The dolomite reservoir plays an important role in the research of carbonate oil and gas reservoirs.The origin of dolo-mite is an integral component in analyzing the evolution of pore-cave-fracture system in high-quality dolomite reservoirs.The dolomites of Middle Permian Qixia Formation,SW Sichuan basin were studied in this paper by the method of petrology and ge-ochemical analyses aiming at the discovery of the origin of dolomites.The dolomites are mainly controlled by fault zones,asso-ciated with zebra fabric.The dolomite fabrics exhibit non-planar saddle crystals and strongly undulose extinctions.In addition, the high degree of order is found in hydrothermal dolomites.The geochemical characteristics of saddle dolomites show noticea-ble negativeδ1 8 O PDB and an enrichment of strontium isotopes.In the end,the dolomites have been proved to be the product of structurally controlled hydrothermal dolomitization on the basis of comprehensive geologic research.
Keywords：SW of Sichuan basinMiddle PermianQixia Formationhydrothermal dolomitegeochemistry
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 167-176 )