陇东油区长8含油砂岩成岩过程中的孔隙度演化

doi:10.3981/j.issn.1000-7857.2014.12.006

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Abstract: The diagenesis and porosity evolution of the oil-bearing sandstone in Chang 8 of Longdong oil-producing region are analyzed by means of casting thin-sections, X-ray diffraction data, scanning electron micrograph observation and physical properties. The oil-bearing sandstone is currently at the first stage of the middle-diagenesis period. It went through strong compaction and violent cementation and weak dissolution, which led to the tight sandstone reservoir. The porosity loss rate of the compaction is 38.9%, the porosity loss rate of the cementation is 38.0%, and the porosity of the dissolution is only 3.9%. The porosity evolution during the diagenesis shows that the primary porosity is 37.3%, the residual intergranular porosity after the compaction and the cementation of the early diagenesis process is 17.9%, the porosity of the first oil charging process is 17.0%, and the porosity of the second oil charging process is only 12.5%, which illustrates that the densification of the oilbearing sandstone occurred between the first oil charging process and the second oil charging process of the middle-diagenesis period.

Key words： Longdong oil-producing region Chang 8 reservoir set oil-bearing sandstone diagenesis process porosity evolution

Received: 13 January 2014

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	Articles by authors
	ZHOU Xiaofeng
	NIU Xiaobing
	WANG Jianguo
	LIANG Xiaowei

Cite this article:

ZHOU Xiaofeng,NIU Xiaobing,WANG Jianguo, et al. Porosity Evolution During Diagenesis of Oil-bearing Sandstone in Chang 8 of Longdong Oil-producing Region[J]. journal1, 2014, 32(12): 41-47.

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http://www.kjdb.org/EN/10.3981/j.issn.1000-7857.2014.12.006 OR http://www.kjdb.org/EN/Y2014/V32/I12/41

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