Microfacies and Sedimentary Environment of the Lower Carboniferous Carbonates in the Marsel Exploration Area,Kazakhstan

doi:10.19657/j.geoscience.1000-8527.2018.03.09

Abstract

Abstract:

Based on thin sections and drill core data, 43 microfacies (MF) and 10 microfacies association (MA) patterns are identified in the Marsel exploration area in Kazakhstan. The MA comprises five rock types, representing different sedimentary environments: mudstone (MF1-MF3) deposited in the outer ramp or low-energy restricted environment; wackstone (MF4-MF13) deposited in lagoons and peritidal flat of the inner, middle or outer ramp; packstone (MF14-MF20) deposited in the low-energy restricted inner ramp; grainstone (MF21-MF34) deposited in subtidal area of the inner ramp and shoals of the middle ramp; crystalline dolostone (MF35-MF37) deposited in evaporate tidal flat; fine-grained clastic rocks (MF38-MF43) deposited in the inner-middle mixed ramp. Types of MA include deposits of the middle-outer ramp (MA2), middle-low energy shoal (MA1, MA8), middle ramp mixed (MA5), middle-high energy shoal and tidal flat (MA6, MA7, MA9), lagoon and tidal flat of the inner ramp (MA3), clastic tidal flat of the inner ramp (MA4), and mixed tidal flat (MA10). Through subfacies and microfacies association analysis, a ramp sedimentary model is established for the Early Carboniferous depositional environment in the Marsel area: During the deposition of the Tournasian-lower Visean-3 member, low-energy restricted lagoon and tidal flat of the inner-middle and middle-outer ramp deposits are developed as the relative sea level rises from slow to rapidly. During the deposition of middle Visean-3 member-Serpukhovian, low-energy restricted lagoon, tidal flat and evaporate tidal flat of the inner ramp deposits were widely developed with local shoals and mixed tidal flat, as the relative sea level falls from slow to rapidly.

Key words: Kazakhstan, Marsel exploration area, Lower Carboniferous, carbonate rocks, carbonate microfacies

CLC Number:

TE122.2

WANG Yuan, LIN Changsong, LI Hao, SUN Yanda, HE Haiquan, WANG Qinglong, ZHANG Zhiyuan, JI Muye. Microfacies and Sedimentary Environment of the Lower Carboniferous Carbonates in the Marsel Exploration Area,Kazakhstan[J]. Geoscience, 2018, 32(03): 511-526.

Figures/Tables 8

Fig.1 Tectonic division and location of the Marsel area

Fig.2 Stratigraphic framework of the Marsel area in well ASSA-2

Table 1 Major Lower Carboniferous rock types in the Marsel area

地层单元		主要岩石类型
谢尔普霍夫阶		石灰岩	颗粒灰岩、泥粒灰岩、粒泥灰岩、灰泥灰岩、含膏云质灰岩
		白云岩	颗粒云岩、泥粉晶云岩、含膏灰质云岩
		碎屑岩	长石粉砂岩
		蒸发岩	石膏岩、盐岩
维宪阶	维三段	石灰岩	泥粒灰岩、粒泥灰岩、灰泥灰岩
		碎屑岩	长石岩屑粉细砂岩、粉砂岩、泥质粉砂岩、粉砂质泥岩
		蒸发岩	石膏岩
	维二段	石灰岩	颗粒灰岩、泥粒灰岩、粒泥灰岩、灰泥灰岩、硅质灰岩
		白云岩	泥粉晶云岩
		碎屑岩	泥岩、页岩
	维一段	石灰岩	颗粒灰岩、泥粒灰岩、粒泥灰岩
	维一段	蒸发岩	石膏岩
杜内阶		石灰岩	灰泥灰岩
杜内阶		碎屑岩	泥岩、页岩

Fig.3 Microfacies characteristics of the Lower Carboniferous carbonates in the Marsel area

Fig. 4 Microfacies characteristics of the Lower Carboniferous carbonates in the Marsel area

Fig.5 Microfacies characteristics ofthe Lower Carboniferous carbonates in the Marsel area

Fig. 6 Microfacies associations of the Lower Carboniferous carbonates in the Marsel area

Fig. 7 Correlation of the Lower Carboniferous microfacies associations and stratigraphy at well TMSK-1—TGTR-6—ASSA-2—KNDK-6 in the Marsel area

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