Characteristics and Formation Mechanism of Incised Valley on the Eastern Margin of Chepaizi Uplift, Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2021.027

Abstract

Abstract:

Incised valleys are important research target of sequence stratigraphy, and are also favorable sites to search for hydrocarbon traps. Based on comprehensive drilling and logging, 3D seismic data and seismic plane attribute information, the sedimentary system of incised valleys is identified from the Chepaizi uplift to the Hongche fault zone, and the development characteristics and formation mechanism of the incised valleys are analyzed. The attribute map of the sum of absolute seismic amplitude shows four nearly EW-trending incised valleys in the study area, which mainly show the plane morphological characteristics of branch-and single-type. In the seismic section, the geometry is mainly V- and U-shaped, and the sediment filling patterns in the valley include two-way-up and lateral-accretion filling types. Meanwhile, seismic reflection characteristics of aggradation, progradation and superelevation are present, suggesting interactive deposition of “source accumulation” and “traceability accumulation”. Based on the analysis of Mesozoic structure and climate evolution characteristics of the Chepaizi uplift, the local incised valleys were formed in the Late Jurassic, during which the Chepaizi uplift was strongly uplifted and the relative lake level dropped sharply. The river eroded the underlying strata, forming the incised valleys. The filling stage of the valleys occurred in the Cretaceous, during which the Chepaizi uplift subsided readily and rose relative to lake level.

Key words: Chepaizi uplift, incised valley, filling pattern, plane feature, lacustrine level change

CLC Number:

TE121.3

QIN Lei, LI Xiaogang, QIU Ziyao, LI Zhijun, XU Shaohua, LI Yiwen, CHEN Cen, WANG Jiabei, WEN Siqi. Characteristics and Formation Mechanism of Incised Valley on the Eastern Margin of Chepaizi Uplift, Junggar Basin[J]. Geoscience, 2021, 35(03): 832-840.

Figures/Tables 5

Fig.1 Location, regional geological characteristics and seismic line sites of the study area

Fig.2 Stratigraphic framework based on well-seismic calibration and typical seismic response to incised valleys in the study area

Fig.3 Typical seismic response to incised valleys and their internal filling configuration (location shown in Fig.1(b))

Fig.4 Map showing the distribution of incised valleys based on amplitude absolute seismic attribute in the study area

Fig.5 Schematic diagram showing the relations between accommodation space and formation of incised valley in the study area

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