Volume 92, Issue 5 pp. 1917-1933
Original Article
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High-Frequency Sequence Stratigraphy and Fine-Scale Reservoir Characterization of the Devonian Sandstone, Donghe Formation, North Uplift of the Tarim Basin

Ziyuan WANG

Ziyuan WANG

School of Earth and Space Sciences, Peking University, Beijing 100871 China

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Li LIU

Corresponding Author

Li LIU

Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, 10611 Exploration Way, Austin, Texas 78713-8924 USA

Corresponding author. E-mail: [email protected]Search for more papers by this author
Mao PAN

Mao PAN

School of Earth and Space Sciences, Peking University, Beijing 100871 China

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Yongmin SHI

Yongmin SHI

School of Earth and Space Sciences, Peking University, Beijing 100871 China

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Fengyang XIONG

Fengyang XIONG

Scholl of Earth Sciences, The Ohio State University, Columbus, 43210 USA

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First published: 25 October 2018
Citations: 2

About the first author:

WANG Ziyuan, born in 1990 in Songyuan City, Jilin Province, obtained a Ph.D. degree from Peking University in 2018. She obtained a Bachelor of Engineering in China University of Petroleum (Beijing) in 2013. During 2015 to 2017, she was an exchange student studying in Bureau of Economic Geology of Jackson School of Geosciences at the University of Texas at Austin. Her research interest includes clastic reservoir characterization and shallow-marine and deep-water depositional systems. E-mail: [email protected].

Abstract

The Devonian Donghe Sandstone complex in North Uplift of the Tarim Basin comprises of a series of diachronous sandy intervals deposited from the Late Devonian to Early Mississippian. They are constrained by a Late Devonian to Early Pennsylvanian 2nd-order supersequence and can be subdivided into five 3rd-order sequences, namely, S1, S2, S3, S4, and S5, from the oldest to youngest. Cores from four wells, 40 wireline logs, 410 thin sections, and porosity and permeability data from 639 spots from four wells were used to study the sediment provenance, build up the sequence-stratigraphic model of S5, and characterize the reservoirs at a feet scale. Detrital modes of sandstone from point counting indicate that Donghe Sandstone is directly sourced from recycled orogeny. The low content of feldspar and volcanic rock fragments suggests that Donghe Sandstone is recycled from sediment with a cratonic ultimate source. 1D and 2D chronostratigraphic correlation shows that at least 12 4th-order high-frequency sequences (HFSs), from the oldest HFS1 to the youngest HFS12, can be recognized in S5. Each HFS is characterized by a general trend of shallowing-upward facies assemblage. Sequence boundaries were defined at where regionally correlatable deep-water facies overlaying shallow-water facies. There is a general shallowing-upward trend in the S5 3rd-order sequence, characterized by a systematically increasing proportion of shallow-water facies (foreshore and upper shoreface), and a decreasing proportion of deep facies (offshore transition and lower shoreface). The shallowing-upward trend within both 3rd- and 4th-order sequences is resulted from a combined effect of eustatic sea-level change, tectonic activity, and sediment supply. The sequence-stratigraphic model of Donghe Sandstone S5 is similar to the rift-basin sequence-stratigraphic model. Sweet spots were defined as porosity >15% and permeability >100md intervals, and their distribution and lateral continuity were investigated. HFS is one of the primary controls on the distribution of sweet spots distribution and can be used to guide hydrocarbon exploration.

 

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