蒙古国塔南凹陷南屯组深凹槽远岸重力流沉积特征

苗长盛; 刘招君; 方石; 陈永成; 胡菲; 王建鹏

doi:10.3799/dqkx.2012.086

Volume 37 Issue 4

Jul. 2012

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Article Navigation > Earth Science > 2012 > 37(4): 771-778

MIAO Chang-sheng, LIU Zhao-jun, FANG Shi, CHEN Yong-cheng, HU Fei, WANG Jian-peng, 2012. Characteristics of the Steep-Slope Off-Shore Subaqueous Fan of Nantun Formation in Ta nan Sag in Mongolia. Earth Science, 37(4): 771-778. doi: 10.3799/dqkx.2012.086

Citation:

MIAO Chang-sheng, LIU Zhao-jun, FANG Shi, CHEN Yong-cheng, HU Fei, WANG Jian-peng, 2012. Characteristics of the Steep-Slope Off-Shore Subaqueous Fan of Nantun Formation in Ta nan Sag in Mongolia. Earth Science, 37(4): 771-778. doi: 10.3799/dqkx.2012.086

Citation:

MIAO Chang-sheng, LIU Zhao-jun, FANG Shi, CHEN Yong-cheng, HU Fei, WANG Jian-peng, 2012. Characteristics of the Steep-Slope Off-Shore Subaqueous Fan of Nantun Formation in Ta nan Sag in Mongolia. Earth Science, 37(4): 771-778. doi: 10.3799/dqkx.2012.086

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Characteristics of the Steep-Slope Off-Shore Subaqueous Fan of Nantun Formation in Ta nan Sag in Mongolia

doi: 10.3799/dqkx.2012.086

1.
Exploration and Production Research Institute, Northeast Oil and Gas Branch, SINOPEC, Changchun 130062, China
2.
College of Earth Sciences, Jilin University, Changchun 130061, China
3.
Key Laboratory of Oil Shale and Coexistent Energy Minerals, Changchun 130061, China

Received Date: 2012-01-18
Available Online: 2021-10-13
Publish Date: 2012-07-15

Abstract

Abstract

The strata of Nantun Formation in Ta nan sag of Mongolia developed a great number of offshore subaqueous fan deposits, which has been determined to have been formed by the supplying source of steep slope of the basin according to the synthetically analysis of the petrologic characteristics, the heavy mineral assemblages and the seismic data, and it is also found out that this subaqueous fan is a kind of infrequent steep-slope offshore subaqueous fan. On the basis of the summary of the seismic, logging and core features, the offshore subaqueous fan can be divided into four kinds of sub-facies (supply channel, inner fan, middle-fan, and outer fan respectively) and several micro facies, and there are significantly different characteristics between different facies belts.The steep-slope offshore subaqueous fan spread along the central fault in the form of string beadings and developed in low stand system tract, transgressive system tract and regressive system. The formation and evolution of the steep-slope offshore subaqueous fan were commonly controlled by three factors, namely, sediment supply, ancient landform and tectonic movement. Despite its poor reservoir properties, amounts of lithologic reservoirs and tectonic-lithologic combined reservoirs often formed in the system owing to the surrounding high pressure dark mudstone. It was influenced by the incontinuous deposition as well as the inner heterogeneity of layers.The reservoirs of the steep offshore subaqueous fan usually are featured with more oil layers, thin single oil layers and different oiliness levels in different layers.
- Ta'nan sag,
- Nantun Formation,
- steep-slope off-shore subaqueous fan,
- genesis and evolution,
- sedimentology,
- petroleum reservoirs

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References(37)

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Characteristics of the Steep-Slope Off-Shore Subaqueous Fan of Nantun Formation in Ta nan Sag in Mongolia

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