DIAGENESIS AND PORE EVOLUTION OF THE LIUSHAGANG FORMATION IN WUSHI SAG

LIU Chong; ZHU Ding-jun; SU Wen-hui; CHEN Jin-ding

doi:10.13686/j.cnki.dzyzy.2013.05.007

2013 Vol. 22, No. 5

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Article navigation > Geology and Resources > 2013 > 22(5): 426-430

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LIU Chong, ZHU Ding-jun, SU Wen-hui, CHEN Jin-ding. DIAGENESIS AND PORE EVOLUTION OF THE LIUSHAGANG FORMATION IN WUSHI SAG[J]. Geology and Resources, 2013, 22(5): 426-430. doi: 10.13686/j.cnki.dzyzy.2013.05.007

Citation:

LIU Chong, ZHU Ding-jun, SU Wen-hui, CHEN Jin-ding. DIAGENESIS AND PORE EVOLUTION OF THE LIUSHAGANG FORMATION IN WUSHI SAG[J]. Geology and Resources, 2013, 22(5): 426-430. doi: 10.13686/j.cnki.dzyzy.2013.05.007

DIAGENESIS AND PORE EVOLUTION OF THE LIUSHAGANG FORMATION IN WUSHI SAG

1.
Zhanjiang Central Laboratory, Research Institute of Energy Technology and Oilfield Engineering, CNOOC, Zhanjiang 524057, Guangdong Province, China;
2.
Zhanjiang Branch, CNOOC, Zhanjiang 524057, Guangdong Province, China

Received Date: 08 October 2012

Revised Date: 06 November 2012

Publish Date: 31 October 2013

Abstract

Abstract

A detailed study is carried out on the diagenesis and pore evolution with thin section observation, X-ray diffraction, scanning transmission electron microscope and vitrinite reflectance. The results show that the rock type of the 2nd and 3rd members of Liushagang Formation in the Wushi Sag is dominated by quartz sandstone, with minor feldspathic quartz sandstone. The size fraction of grains is moderate to poor. The diagenesis of the sandstone has reached to Stage A of the middle diagenetic period. The pores are mainly primary intergranular and secondary dissolution types. The primary intergranular pores decrease with the compaction and cementation of sandstone, while the secondary pores increase with dissolution, which improve the physical property of reservoir.
- Wushi Sag /
- Liushagang Formation /
- diagenesis /
- diagenetic stage /
- pore evolution