Provenance and diagenesis of the Upper Jurassic Qigu Formation sandstones in the southern Junggar Basin, NW China
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ORIGINAL PAPER
Provenance and diagenesis of the Upper Jurassic Qigu Formation sandstones in the southern Junggar Basin, NW China Huaguo Wen 1,2 & Yanxia Jiang 1,2 & Hu Huang 1,2 & Yapeng Liu 1,2 & Tao Wang 1,2 & Yiqin Jiang 3 & Jun Jin 3 & Liqi Qi 3
Received: 17 September 2015 / Accepted: 22 April 2016 / Published online: 21 May 2016 # Saudi Society for Geosciences 2016
Abstract The Upper Jurassic Qigu Formation sandstones in the southern Junggar Basin typically have calcite cements. Two stages of calcite cements which were distinguished based on cathodoluminescence and casting body slice image increased rock pressure resistance to a certain extent, effectively prevented the quartz overgrowth, and are characterized by a style of filling of intergranular porosity that deteriorated the reservoir permeability. Result from the laser ablation inductively coupled plasma mass spectrometry indicates that the detrital zircons in the Qigu Formation sandstones are mostly magmatic in origin with U-Pb zircon ages of ∼300 and ∼160 Ma. These detrital zircons were largely derived from the Late Carboniferous to Early Permian and Late Jurassic magmatic rocks in the Tianshan area. All clastic rocks exhibit negative Nb, Ta, and Ti anomalies on primitive mantlenormalized elemental diagrams and high Al2O3/TiO2 ratios, implying the existence of a sedimentary source dominated by intermediate and felsic magmatic rocks. Our result indicates that the Late Jurassic volcanism may be extensively distributed around the Tianshan area. The diagenesis of calcite Electronic supplementary material The online version of this article (doi:10.1007/s12517-016-2483-x) contains supplementary material, which is available to authorized users. * Huaguo Wen [email protected]
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
3
Research Institute of Experiment and Detection, Xinjiang Oilfield Company, Petro China Company Limited, Karamay 834000, China
cements could decrease the Al2O3, TiO2, MgO, K2O, Hf, Th, and Zr contents and increase the MnO content, which may play an important role in variational contents of elements. Keywords Junggar Basin . Qigu Formation . Sandstone . Provenance . Diagenesis
Introduction The Junggar Basin, located in the north of the Tianshan mountain range (Fig. 1), is a giant intraplate Meso-Cenozoic basin (Bian et al. 2010; Yang et al. 2015). This basin is also an important oil, natural gas, and coal-bearing basin (Tang et al. 1997). Organic-rich Jurassic strata are widespread throughout this basin (Ashraf et al. 2010; Fang et al. 2015). Of the key elements of petroleum systems in the Junggar Basin, reservoir quality is the most poorly understood. Few diagenetic studies have been carried out to decipher the porosity history and the factors controlling the reservoir quality in the sandstones. Besides, the provenance and depositional environment are important
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