ANALYSIS ON DENSIFICATION PROCESS OF CHANG 6 SANDSTONES IN WESTERN ORDOS BASIN

Chonghui SHEN; Xiaofeng ZHOU; Wei GUO

doi:10.12090/j.issn.1006-6616.2018.24.06.080

2018 Vol. 24, No. 6

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Chonghui SHEN, Xiaofeng ZHOU, Wei GUO. ANALYSIS ON DENSIFICATION PROCESS OF CHANG 6 SANDSTONES IN WESTERN ORDOS BASIN[J]. Journal of Geomechanics, 2018, 24(6): 776-784. doi: 10.12090/j.issn.1006-6616.2018.24.06.080

Citation:

Chonghui SHEN, Xiaofeng ZHOU, Wei GUO. ANALYSIS ON DENSIFICATION PROCESS OF CHANG 6 SANDSTONES IN WESTERN ORDOS BASIN[J]. Journal of Geomechanics, 2018, 24(6): 776-784. doi: 10.12090/j.issn.1006-6616.2018.24.06.080

ANALYSIS ON DENSIFICATION PROCESS OF CHANG 6 SANDSTONES IN WESTERN ORDOS BASIN

1.
China University of Geoscience, Beijing 100083, China
2.
China University of Petroleum, Beijing 102249, China
3.
Langfang Branch of Research Institute of Petroleum Exploration and Development, Petro China, Langfang 065007, Hebei, China

Received Date: 28 December 2017

Revised Date: 21 March 2018

Abstract

Abstract

By core physical property, casting slice, scanning electron microscope analysis with energy disperse spectroscopy, the densification process of Chang 6 sandstones in western Ordos Basin was studied quantitatively. The study showed that the initial porosity and permeability of sandstones in the area were 39.3% and 22400×10^-3 μm² respectively, and its densification process was divided into two stages. In the course of early diagenesis stage, both calcite and chlorite coat cements and mechanical compaction caused the sandstones into ultra-low permeability reservoir whose porosity and permeability were 8.0% and 0.17×10^-3 μm² apart. During hydrocarbon accumulation in middle diagenesis stage A, hydrocarbon with organic acid came into this ultra-low permeability sandstones, and under organic acid circumstance feldspar dissolution formed secondary pore, which made porosity and permeability up to 11.6% and 0.61×10^-3 μm² individually. So the relationship between the densification process of Chang 6 sandstone and hydrocarbon accumulation is first densification then accumulation and accumulation with increased porosity and permeability.
- first densification then accumulation /
- accumulation with increased porosity and permeability /
- ultra-low permeability sandstone /
- Chang 6 /
- Ordos Basin

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