首页|Type division and controlling factor analysis of 3rd-order sequences in marine carbonate rocks

Type division and controlling factor analysis of 3rd-order sequences in marine carbonate rocks

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Type division and controlling factor analysis of 3rd-order sequence are of practical significance to tec-tonic analysis, sedimentary environment identification, and other geological researches. Based on the comprehensive analysis of carbon and oxygen isotope trends, paleobathymetry and spectral-frequency of representative well logs, 3rd-order sequences can be divided into 3 types: (a) global sea level (GSL) sequence mainly controlled by GSL change;(b) tectonic sequence mainly controlled by regional tectonic activity;and (c) composite sequence jointly controlled by GSL change and regional tectonic activity. This study aims to identify the controlling factors of 3rd-order sequences and to illustrate a new method for classification of 3rd-order sequences of the middle Permian strata in the Sichuan Basin, China. The middle Permian strata in the Sichuan Basin consist of 3 basin-contrastive 3rd-order sequences, i.e., PSQ1, PSQ2 and PSQ3. Of these, PSQ1 is a GSL sequence while PSQ2 and PSQ3 are composite sequences. The results suggest that the depositional environment was stable during the deposition of PSQ1, but was activated by tectonic activity during the deposition of the middle Permian Maokou Formation.

Carbon isotope3rd-Order sequenceMilankovitch cyclesMiddle Permian strataSichuan Basin

Yunbo Zhang、Zongju Zhao、Genhou Wang、Zaixing Jiang、Mingjian Wang、Min Zheng、Shiben Zhang

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China University of Geosciences Beijing, Beijing 100083, China

Chinese Petroleum Society, Beijing 100724, China

Qingdao Institute of Marine Geology, Shandong 266071, China

Research Institute of Petroleum Exploration and Development, Beijing 100083, China

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Our research was part of a key projectNational Major Special Science and Technology ProjectMajor Special Issue of the China National Petroleum Corporation

2008e20112008ZX05004-0012008E-0702

2014

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSCDSCI
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2014.(2)
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