蓬莱9-1潜山岩性组成及其对储层发育的控制

李建平; 周心怀; 王国芝

doi:10.3799/dqkx.2014.134

Volume 39 Issue 10

Oct. 2014

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Li Jianping, Zhou Xinhuai, Wang Guozhi, 2014. Lithologic Constitution and Its Control on Reservoir Development on Penglai 9-1 Buried Hill, Bohai Sea Basin. Earth Science, 39(10): 1421-1430. doi: 10.3799/dqkx.2014.134

Citation:

Li Jianping, Zhou Xinhuai, Wang Guozhi, 2014. Lithologic Constitution and Its Control on Reservoir Development on Penglai 9-1 Buried Hill, Bohai Sea Basin. Earth Science, 39(10): 1421-1430. doi: 10.3799/dqkx.2014.134

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Lithologic Constitution and Its Control on Reservoir Development on Penglai 9-1 Buried Hill, Bohai Sea Basin

doi: 10.3799/dqkx.2014.134

1.
Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
2.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2014-04-02
Publish Date: 2014-10-01

Abstract

Abstract

A new oil field with a reserve of more than 100 million tons has been found in the Penglai 9-1 buried hill, consisting of Paleoproterozoic metamorphic rocks and Yanshan granites. The granites surrounded by Paleoproterozoic metamorphic rocks are distributed in central valley floor of the buried hill. The oil pool mainly accumulates in the reservoirs of granite weathered crust located in the valley floor of the buried hill. The granites can be classified into granodirorite and adamellite. Paleoproterozoic metamorphic rocks mainly consist of phyllite, schist, metasandstone, quartzite and mylonite. Although both metamorphic rocks and granites have experienced similar weathering and deformation, differences in mineral constitution, mechanical property and weathering ways between metamorphic rocks and granites result in alternative development of high quality reservoirs in the granites. The reservoirs in metamorphic rocks belong to porosity types and development of secondary porosity is quite limited, no effective reservoirs may be formed in the metamorphic rocks. The reservoirs in granites are characterized by development of porosity and fissure, high quality reservoirs mainly develop in the sandy, pebbly weathering zone and fissured zone, in which the reservoirs in fissured zone are the thickest. Except for intensity of hypergenic karstification and tectonic deformation, lithologic constitution and lithofacies of the granites play a controlling role in development of high quality reservoirs in granite weathered crust. The factors such as weathered intensity, deformation, lithologic constitution and lithofacies, etc. contribute to vertical zonation characteristics of weathered crust reservoir at the granite buried hill, the reservoir types changed from porosity to fissure from the top of the weathered crust to the bottom. The various secondary porosity and fissure are the most important reservoir spaces in buried hill granite reservoirs.
- Penglai 9-1 oil field,
- metamorphic rock,
- granite,
- lithologic constitution,
- reservoir

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Lithologic Constitution and Its Control on Reservoir Development on Penglai 9-1 Buried Hill, Bohai Sea Basin

doi: 10.3799/dqkx.2014.134

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