GEP  Vol.7 No.4 , April 2019
Petrology Characters of Conglomerates in Baikouquan Formation, Mahu Sag, Junggar Basin
Abstract: Mahu Sag, one of the most oil and gas bearing sags in Junggar basin, is in the northwestern margin of the basin. On gentle slope region of the sag, a serial of large scale coarse fan delta deposits were developed in Triassic Baikouquan Formation. In order to understand the petrology characters of conglomerates in Baikouquan Formation, based on lots of cores, grain size analysis, normal thin sections, casting thin sections, scanning electron photomicrographs, mineral composition identifications, clay mineral and bulk composition identifications of X-ray diffraction, were comparatively studied for Xiazijie and Huangyangquan fan-delta in Mahu Sag. Mineral composition of conglomerates is main tuff, while eurite, dacite, rhyolite, andesite and granite are common. However, more tuff and granite, less eurite and andesite in Xiazijie fan-delta, there is no rhyolite in Huangyangquan fan-delta. Kaolinization and chloritization of conglomerates are ubiquitous in the formation. The content of chlorite and kaolinite is higher in Xiazijie fan-delta, with lower illite-smectite and illite. There is less feldspar of clastic and more calcite of cement in Xiazijie fan-delta.
Cite this paper: Zhang, H. , Lin, X. and Wang, C. (2019) Petrology Characters of Conglomerates in Baikouquan Formation, Mahu Sag, Junggar Basin. Journal of Geoscience and Environment Protection, 7, 214-222. doi: 10.4236/gep.2019.74014.

[1]   Cao, J., Zhang, Y. J., & Hu, W. X. (2005). Developing Characteristics of kaolInite in Central Junggar Basin and Their Effect on the Reservoir Quality. Acta Mineralogica Sinica, 25, 367-373.

[2]   He, D. F., Yin, C., & Du, S. K. (2004). Characteristics of Structural Segmentation of Foreland Thrust Belts: A Case Study of the Fault Belts in the Northwestern Margin of Junggar Basin. Earth Science Frontiers (China University of Geosciences, Beijing), 11, 91-101.

[3]   Kuang, J., & Qi, X. F. (2006). The Structural Characteristics and Oil-Gas Explorative Direction in Junggar Foreland Basin. Xinjiang Petroleum Geology, 27, 5-9.

[4]   Kuang, L. C., Tang, Y., & Lei, D. W. (2014). Exploration of Fan-Controlled Large-Area Lithologic Oil Reservoirs of Triassic Baikouquan Formation in Slope Zone of Mahu Depression in Junggar Basin. China Petroleum Exploration, 19, 14-23.

[5]   Lei, D. W., Abulimiti, Tang, Y., et al. (2014). Controlling Factors and Occurrence Prediction of High Oil-Gas Production Zones in Lower Triassic Baikouquan Formation of Mahu Sag in Junggar Basin. Xinjiang Petroleum Geology, 35, 495-499.

[6]   Liu, Y. P., Wen, H. G., & Huang, J. L. (2016). Characteristics of Authigenic Chlorite of Toutunhe Formation in the Northern Region of Fubei, Junggar Basin, China. Journal of Chengdu University of Technology (Science & Technology Edition), 43, 487-496.

[7]   Qu, J. H., Guo, W. J., & You, X. C. (2015). Characteristics of Xiazijieslope Breaks in Mahu Sag and Control Effect on Sand Bodies. Xinjiang Petroleum Geology, 36, 127-133.

[8]   Tan, K. J., Wang, G. D., & Luo H.F., (2014). Reservoir Characteristics and Controlling Factors of the Triassic Baikouquan Formation in Mahu Slope Area, Junggar Basin. Lithologic Reservoirs, 26, 83-88.

[9]   Tang, Y., Xu, Y., & Qu, J. H. (2014). Fan-Delta Group Characteristics and Its Distribution of the Triassic Baikouquan Reservoirs in Mahusag of Junggar Basin. Xinjiang Petroleum Geology, 35, 628-635.

[10]   Yu, X. H., Qu, J. H., & Tan, C. P. (2014). Conglomerate Lithofacies and Origin Models of Fan Deltas of Baikouquan Formation in Mahu Sag, Junggar Basin. Xinjiang Petroleum Geology, 35, 619-627.

[11]   Zhang, S. C., Zou, N. N., & Shi, J. (2015a). Depositional Model of the Triassic Baikouquan Formation in Mahu Area Junggar Basin. Oil & Gas Geology, 36, 640-650.

[12]   Zhang, Y. W., Zeng, J. H., & Qu, Z. Y. (2015b). Development Characteristics and Genetic Mechanism of Authigenic Kaolinite in Sandstone Reservoirs of the Dongying Sag, Bohai Bay Basin. Oil & Gas Geology, 36, 73-79.

[13]   Zhi, D. M. (2016). Discovery and Hydrocarbon Accumulation Mechanism of Quasi Continuous High Efficiency Reservoirs of Baikouquan Formation in Mahu Sag, Junggar Basin. Xinjiang Petroleum Geology, 37, 373-382.