鄂尔多斯东部下二叠统山西组2段储层评价及勘探前景

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Abstract The Member 2 of Shanxi Formation of Lower Permian in the eastern Ordos Basin is characterized by low permeability. Based on the analysis of high-resolution sequence stratigraphic division and correlation, the Member 2 of Shanxi Formation in the study area can be divided into three long term cycles. The analyses of 425 thin sections observation, SEM, cathode luminescence, etc. indicate that the Member 2 was a set of sandy-braided deposits which was distant to the source of sediment and was developed in the strong erosion setting at the shoreline. Influenced by the differentiation of source of sediment and the hydrodynamic conditions, the sedimentary characteristics of the Yulin, Shenmu and Fugu Rivers were obviously different. The channel sandbody of the Yulin River was a set of quartz sandstones with a high content of quartz, a low content of matrix and soft lithic fragment, and little feldspar. The reservoir was dominated by compound pore in which the inter granular pore was mainly developed. Its reservoir was favorable, On the contrast, the channel sand bodies of the Shenmu and Fugu Rivers were lithic quartz sandstones with a low content of quartz, a high content of matrix and soft lithic- fragment, and a low content of feldspar generally. The reservoir quality was poor with a few amounts of intra granular solution pores being developed. Diagenetic analyses indicate that the Member 2 of Shanxi Formation belongs to the late diagenetic B stage. At this stage, the compaction and pressure solution were very strong and a great deal of the primary pore in Yulin area was preserved due to the Member 2 reservoir of Shanxi Formation. The differences of sedimentary reservoir characters between quartz, sandstone and lithic sandstone are generalized. The next exploration target in the study area is predicted, i. e. the channel sandbody in which high permeable quartz sand stone is developed in the Member 2 of Shanxi Formation in the Yulin River sedimentary area, which is characterized by the Yulin Gasfield.

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	Articles by authors
	Liu Ruie
	Li Wenhou
	Chen Mengjin
	Zhang Chunlin
	Sun Fenjin
	Wang Yali
	Xiao Hongping
	Lin Jie

Key words： easten Ordos Shanxi Formation reservoir evaluation exploration prospect

Received: 17 November 2005

ZTFLH:	P618
	130.2+1

About author: Liu Rui’e, born in 1963, graduated from the Geology Department of Northwest University and got her doctoral degree in 2004. Now she is a senior engineer and is engaged in sedimentary reservoir in Langfang Branch, Research Institute of Petroleum Exploration m Development PetroChina. E-mail: Liuruie436@sohu com

Cite this article:

Liu Ruie,Li Wenhou,Chen Mengjin et al. Reservoir evaluation and exploration prospect of the Member 2 of Shanxi Formation of Lower Permian in eastern Ordos[J]. JOPC, 2006, 8(4): 531-538.

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http://www.gdlxb.cn/EN/ OR http://www.gdlxb.cn/EN/Y2006/V8/I4/531

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