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AAPG Bulletin

Abstract

AAPG Bulletin, V. 102, No. 11 (November 2018), P. 2389-2408.

Copyright ©2018. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/04251816530

Oligocene shallow-water lacustrine deltas of the Baxian sag of Bohai Bay Basin, eastern China: Depositional response during rift-to-thermal tectonic subsidence transition

Chuanyan Huang,1 Hua Wang,2 Hongwei Zhang,3 Jianping Wu,4 and Yingjie Liu5

1Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, China University of Geosciences, No. 388, Lumo Road, Wuhan 430074, Hubei, China; [email protected]
2Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, China University of Geosciences, No. 388, Lumo Road, Wuhan 430074, Hubei, China; [email protected]
3Research Institute, Bureau of Geophysical Prospecting, Inc., China National Petroleum Corporation, No. 189, Fanyang West Road, Zhuozhou 072751, Hebei, China; [email protected]
4Exploration and Development Institute, Huabei Oilfield Company, PetroChina, No. 2699, Qianjin Road, Changchun 065002, Jilin, China; [email protected]
5Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, China University of Geosciences, No. 388, Lumo Road, Wuhan 430074, Hubei, China; [email protected]

ABSTRACT

Using cores, well logs, and other borehole data, the results of this study show that the shallow-water lacustrine delta has its own unique depositional characteristics of the third member of Oligocene Dongying Formation (Ed3) in the Baxian sag, Bohai Bay Basin, eastern China. During the Ed3 stage, the rift–thermal basin subsidence transition stage, the paleoslope was divided into multilevel slopes by faults along the Wen’an slope with slope angles from approximately 0.19° to 2.02°. The paleogeographic conditions, low-discharge channel, and low accommodation controlled the sedimentary characteristics. The distributions of the shallow-water delta system were controlled by multilevel flexure slopes. The delta plain was distributed on the first- and second-level slope belts, and the delta front was distributed on the third-level slope belt. The high-sinuosity fluvial channel of the delta plain was the dominant facies in the whole shallow-water delta. Most sand was deposited in these channels along the second-level slope belt. Therefore, not enough sand was present to be transported into the lake (shallow water) to form mouth bars in the delta front. Therefore, mouth bars of the shallow-water delta front were few, and the sand beds were thin. Additionally, no more sand was available to be supplied right along to deep lake, the lacustrine basin was small, and there was insufficient accommodation and sand to develop a subaqueous fan in the delta front.

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