Diagenesis of heavy minerals in the Upper Triassic Yanchang Formation of Ordos Basin
Li Yun1,2, Hu Zuowei1,2, He Jing3, Yuan Xiaoqi3, Deng Xiuqin3
1.Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan 2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan 3.Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, Shaanxi
Abstract The heavy minerals in sandstones in the burial diagenetic environment will suffer the solution and even form new heavy mineral cements. Provenance analysis method by using the characteristics of heavy minerals is one of the most important methods in the Upper Triassic Yanchang Formation of Ordos Basin. However,three kinds of heavy minerals, including garnet,sphene and epidote, have changed a lot during their diagenetic stage. Garnet was dissolved and become facet garnet,some was replaced by calcite,chlorite or quartz. The authigenic sphene crystals and sphene overgrowth were discovered,and sphene growth had several times. Authigenic epidote crystals and epidote overgrowths were seen,part of epidotes were replaced by chlorite or quartz. Garnet with relatively strong stability was dissolved,and detrital sphene and epidote with relative weak stability were not dissolved. This phenomenon is not consistent with knowledge of the heavy mineral stability in previous studies,and we hope it could be taken seriously by the researchers in the future.
About author: Li Yun, born in 1983, is a lecturer of Chengdu University of Technology. She is mainly engaged in teaching and research on reservoir sedimentology. E-mail: liyun2012@cdut.cn. About the corresponding author Hu Zuowei, born in 1981, is an assistant professor of Chengdu University of Technology. He is mainly engaged in teaching and research on sedimentary geology. E-mail: huzuowei@foxmail.com.
Cite this article:
Li Yun,Hu Zuowei,He Jing et al. Diagenesis of heavy minerals in the Upper Triassic Yanchang Formation of Ordos Basin[J]. JOPC, 2015, 17(1): 119-128.
Li Yun,Hu Zuowei,He Jing et al. Diagenesis of heavy minerals in the Upper Triassic Yanchang Formation of Ordos Basin[J]. JOPC, 2015, 17(1): 119-128.
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