High-resolution Stratigraphy of Upper Carboniferous-Middle Permian in Southern North China and Its Northern Surroundings

doi:10.19657/j.geoscience.1000-8527.2020.021

Abstract

Abstract:

Permo-Carboniferous source rocks in southern North China are widely developed and become an important target for shale-gas exploration. However, regional study on the Carboniferous-Permian sequences is still inadequate due to the complex structure and unclear stratigraphic correlation. Based on high-resolution stratigraphy, sedimentology, core-logging, and seismic data from twelve wells, we first establish the stratigraphic sequence of the region. The results show that the Taiyuan, Shanxi and Xiashihezi formations belong to an incomplete super-long cycle, which could be divided into five long-term cycles and 14 medium-term cycles. The medium-term base-level circle structure patterns can be divided into three types:A and B, incomplete symmetrical type dominated by (A) ascending hemicycle and (B) descending semicircular gyrus; C, nearly half ascending and half descending with the same type of symmetry. A-type patterns are mostly developed in the nearshore delta sedimentary environment, whilst B-type patterns are mostly developed in the intertidal to subtidal/lagoon environment. Meanwhile, C-type patterns are common in shallow-water (deltaic or tidal) environments. Geostatistical analysis of the stratigraphic sequences (from north to south and from east to west) has found no regional discontinuities or unconformities.Due to local late-tectonic influence, the seesaw-style uplift may have generated local discontinuities, which formed the pseudo-unconformity between the upper and lower parts of the sequence.

Key words: southern North China, Upper Carboniferous-Midddle Permian, high-resolution stratigraphy, base-level cycle

CLC Number:

LI Yang, RUAN Zhuang, LI Zhongming, YU Bingsong, SONG Nannan, DONG Guoguo, ZHANG Dong. High-resolution Stratigraphy of Upper Carboniferous-Middle Permian in Southern North China and Its Northern Surroundings[J]. Geoscience, 2020, 34(04): 718-731.

Figures/Tables 10

Fig.1 Structural units (a) and Upper Carboniferous-Middle Permian stratigraphy (b) of the study area(modified after reference [34])

Fig.2 Seismic reflection characteristics of the ultra-long-term cyclic sequence interface in the study area

Fig.3 Sequence interface identification mark

Fig.4 Identification marks of flooding surface

Fig.5 Stratigraphic division for the Upper Carboniferous-Middle Permian sequence in the study area

Fig.6 Structural types of base-level cycles

Fig.7 Stratigraphic comparison across the wells ZK1201-ZK0063-K40-MY1-WC1

Fig.8 Stratigraphic comparison across the wells ZK2801-ZK11501-ZK1608-K40

Fig.9 Stratigraphic comparison across the wells MY1-WC1-N8-ZC8

Fig.10 Stratigraphic sequence in southern North China and its northern surroundings

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