Clay Mineral Compositions and Its Genesis in Lower Permian Fengcheng Formation of Mahu Sag, Junggar Basin

doi:10.7657/XJPG20220105

Abstract

Abstract:

In this study, X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the composition characteristics and genesis of clay minerals in the source rocks of the Lower Permian Fengcheng formation of the alkaline lacustrine facies in the Mahu sag, Junggar basin. The results show that the smectite and illite/smectite mixed layer has a higher content, but the illite content is lower, showing slow illitization of smectite. Considering the depositional background of the Fengcheng formation, it is concluded that the abnormal transformation of smectite is mainly affected by the volcanic rock, climate and diagenetic fluids in the source area. The intermediate-basic volcanic rock and the dry/wet alternating climate promoted the formation of smectite, while the alkaline water with CO2-3 as the primary anion inhibited the illitization of smectite.

Key words: Junggar basin, Mahu sag, Fengcheng formation, clay mineral, alkaline lake, smectite, illitization

CLC Number:

TE121

ZHOU Xuelei, QI Wen, HUANG Yu, ZHANG Huquan, PAN Shuxin, WU Jia, FANG Peng. Clay Mineral Compositions and Its Genesis in Lower Permian Fengcheng Formation of Mahu Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(1): 34-41.

Figures/Tables 7

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Table 1

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Table 2

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井名	深度/ m	水型	pH值	CO2-3 / （mg·L^-1）	HCO- 3/ （mg·L^-1）	Cl^-/ （mg·L^-1）	SO2-4 / （mg·L^-1）	Ca²⁺/ （mg·L^-1）	Mg²⁺/ （mg·L^-1）	K⁺和Na⁺/ （mg·L^-1）
风城1井	4 219	NaHCO₃	9.67	34 233.78	26 107.47	22 058.55	3 268.50	19.94	7.26	51 922.24
风城1井	4 219	NaHCO₃	8.62	363.07	6 434.38	109.22	88.30	15.85	4.21	2 790.59
风南5井	4 065	NaHCO₃	8.38	156.18	92 265.44	269.90	112.40	33.90	18.75	35 051.47
风南8井	4 256	NaHCO₃	9.22	6 162.43	13 611.46	24 795.15	1 118.20	41.59	728.19	25 050.91
风南8井	4 256	NaHCO₃	9.21	6 436.31	13 298.15	24 790.19	1 156.80	72.78	734.50	25 110.29
风南14井	4 113	NaHCO₃		0	72 850.86	41 858.08	39.52	2.22	57.90	54 523.72
风南14井	4 113	NaHCO₃		0	72 850.86	39 890.40	40.29	2.22	68.67	53 227.07