Distribution and hydrocarbon significance of source rock in the Upper Xiaoerbulake Formation, Tarim Basin, NW China

被引：0
作者：
Xu Z. [1 ]
Hu S. [1 ]
Zeng H. [2 ]
Ma D. [1 ]
Luo P. [1 ]
Hu Z. [3 ]
Shi S. [1 ]
Chen X. [1 ]
Tao X. [1 ]
机构：
[1] PetroChina Research Institute of Petroleum Exploration & Development, Beijing
[2] Bureau ofEconomic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, 78713, TX
[3] PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou
来源：
Earth Science Frontiers | 2024年 / 31卷 / 02期
关键词：
argillaceous limestone; hydrocarbon exploration significance; seismic sedi-mentology; source rock; Tarim Basin; Upper Xiaoerbulake Formation;
D O I：
10.13745/j.esf.sf.2023.2.54
中图分类号：
学科分类号：
摘要：
It is believed that Lower Paleozoic marine source rock in the Tarim Basin is mainly mudrock of the Lower Cambrian Yuertusi Formation and minor mudrock of the Middle-Lower Ordovician, while the Lower Cambrian Upper Xiaoerbulake Formation is mainly dolostone reservoir rock. Wells drilled in Tazhong and Tabei areas discovered argillaceous limestone in the Upper Xiaoerbulake Formation. Argillaceous limestone samples from recently drilled wells Jingnengketan-1 and Luntan-3 possess high TOC (most exceed 0. 3%, some over 2%). Other five wells in different locations in the Tarim Basin reveal effective source rock in argillaceous limestone (and/or dolostone) of the Upper Xiaoerbulake Formation. Evidences from wells agree with dark argillaceous limestone observed in the Upper Xiaoerbulake Formation at the Sugaitebulake outcrop. TOC of the samples selected from the outcrop is 0. 41% on average, and R„ 1.14%. The above observations demonstrate the existence of effective argillaceous limestone source rock in the Upper Xiaoerbulake Formation. Based on data from outcrop, seismic, and well, the paper proposes a sedimentary mode of multi-period overlaid reef-shoal-source system in the inner platform in the Upper Xiaoerbulake Formation by means of seismic sedimentology, seismic attributes and forward modeling. According to the findings, source rock is located in the area where dip angle decreases from fore-reef to slope. The argillaceous limestone source rock is wide and thick, which makes it a large-scale effective hydrocarbon source for the nearby reservoir rock. The source rock in Gucheng 3D seismic survey can provide billions of tons of hydrocarbon. The knowledge derived from this paper extends type, stratum and area of Lower Paleozoic marine source rock in the Tarim Basin, elevates hydrocarbon resource potential in the presalt Cambrian plays, strengthens the strategy of transferring exploration focus from platform margin to inner platform, and inspires hydrocarbon exploration in Gucheng area as well as in the Tarim Basin. © 2024 Science Frontiers editorial department. All rights reserved.
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页码：343 / 358
页数：15
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