About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

AAPG Bulletin, V. 103, No. 2 (February 2019), P. 469-504.

Copyright ©2019. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/08031817307

Anatomy of a lacustrine stratigraphic sequence within the fourth member of the Eocene Shahejie Formation along the steep margin of the Dongying depression, eastern China

Zhixin Li,1 Wan Yang,2 Yongshi Wang,3 Liqiang Zhang,4 Hongmei Luo,5 Shuhui Liu,6 Likuan Zhang,7 and Xiaorong Luo8

1School of Geosciences, China University of Petroleum, Qingdao, China; [email protected]
2Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, Missouri; Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources, Chinese Academy of Sciences, Beijing, China; [email protected]
3Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying, China; [email protected]
4School of Geosciences, China University of Petroleum, Qingdao, China; [email protected]
5Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying, China; [email protected]
6Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying, China; [email protected]
7Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources, Chinese Academy of Sciences, Beijing, China; [email protected]
8Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources, Chinese Academy of Sciences, Beijing, China; [email protected]

ABSTRACT

A comprehensive study on rift stratigraphy requires a solid understanding of sequence architecture along the steep margins of rift basins. This study analyzes an Eocene lacustrine sequence along the steep margin of the Dongying depression in eastern China through integrated core, well-log, and three-dimensional seismic analyses. The lacustrine sequence is bounded by unconformities and their correlative conformities at the base and top and consists of three systems tracts, namely an early expansion systems tract (EEST), late expansion–early contraction systems tract (LEECST), and late contraction systems tract (LCST), which record a lake expansion–contraction cycle. These systems tracts differ in thickness and development of depositional systems. The EEST is the thickest and contains well-developed marginal and basinal fan systems with an overall retrogradational stacking pattern. The well-developed fan systems are the most striking features within the sequence. The LEECST is the most widespread and contains dominantly profundal–sublittoral deposits. The LCST is the thinnest, with poorly developed fan systems, and is characterized by significant erosion by fluvial incision. The variable thickness and development of depositional systems in the three systems tracts are the responses to the interplay of sediment supply and accommodation space. Accommodation space establishes the framework for sedimentary infill, and sediment supply determines spatial distribution and temporal evolution of depositional systems within each systems tract. This study provides a lake expansion–contraction scheme to divide a lacustrine stratigraphic sequence into systems tracts and highlights the feasibility of applying this approach in studying sequence stratigraphy along the steep margin of a lacustrine rift basin. The results also provide understandings for the development, distribution, and evolution of depositional systems and their controlling factors along the steep margin of other rift basins in the world.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].