THE POROSITY CHARACTERISTICS OF SEDIMENTARY AND DIAGENETIC ENVIRONMENT FOR SHAN-2 MEMBER TO HE-8 MEMBER AT THE UPPER PALEOZOIC IN NORTHERN SHAANXI SLOPE

WANG Yi-xuan; ZHANG Xiao-dong; SUN Yong; AN Xing-yu

Volume 20 Issue 3

Sep. 2014

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Article Navigation > Journal of Geomechanics > 2014 > 20(3): 230-242

WANG Yi-xuan, ZHANG Xiao-dong, SUN Yong, et al., 2014. THE POROSITY CHARACTERISTICS OF SEDIMENTARY AND DIAGENETIC ENVIRONMENT FOR SHAN-2 MEMBER TO HE-8 MEMBER AT THE UPPER PALEOZOIC IN NORTHERN SHAANXI SLOPE. Journal of Geomechanics, 20 (3): 230-242.

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THE POROSITY CHARACTERISTICS OF SEDIMENTARY AND DIAGENETIC ENVIRONMENT FOR SHAN-2 MEMBER TO HE-8 MEMBER AT THE UPPER PALEOZOIC IN NORTHERN SHAANXI SLOPE

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
China Henan International Cooperation Group Co., Ltd, Zhengzhou 450004, China
3.
Shandong Bureau of China Metallurgical Geology Bureau, Jinan 250100, China

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Abstract

Abstract

The typical low permeability lithological reservoir is the main reservoir which has been developed from Shan-2 member to He-8 member at the upper Paleozoic in Northern Shaanxi slope, Ordos Basin. The reservoir properties dominate the enrichment of oils and gas. The merits of tight reservoir porosity are associated with their sedimentary and diagenetic environment. In this paper, the influence of the late-diagenetic on reservoir porosity was discussed according to the sedimentary particle size analysis and scanning electron microscopy observation. From the result of this study, we can draw the conclusion that the chief destructions of reservoir-quality which is in the transform sequence of "Montmorillonite-Andreattite-Illite" are the cementation and the evolution of clay cementation. Furthermore, the clay membrane of chlorite which is developed in the surface of clastic particles can protect the reservoir porosity from the late-cementation while block the primary porosity. Therefore the clay membrane of chlorite can be one of the criteria to judge the reservoir-quality in gas reservoir exploration.
- Northern Shaanxi Slope,
- Shanxi Formation,
- Shihezi Formation,
- diagenetic,
- porosity

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致谢: 文章撰写过程中得到王根厚教授、袁国礼教授及李海龙博士的悉心指导，在此一并表示感谢。

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