| Author's Name: Long Gengsheng, Shi Hesheng, Zheng Rongcai, Du Jiayuan, Chen Shuhui, Ge Yanzhao |
| Institution: Shenzhen Branch of CNOOC Ltd. |
| Abstract: |
| The Paleogene strata are constituted of Wenchang, Enping and Zhuhai Formations in Huizhou Depression.Deep reservoirs are in Enping and Zhuhai Formations. The reservoirs mainly consist of secondary porosity such as in tergranular and intragranular dissolved pores, and clay mineral micropores as well as residual primary intergranular pores and fissures, among which the average primary porosity is 2.4% (accounting for 22.2% of the total porosity), the average secondary porosity is 5.6% ( 65.2% of the total) and the average fissure porosity is 1.0% (12.5% of the total). Development of secondary porosity improved the reservoir capacity of deep sandstone due to dissolution of organic acid to skeleton grains and matrix in sandstone. The secondary porosity developed well in a depth range of 3500～4200m where reservoir property is good but the secondary porosity is obviously decreased in the depth of 4200～4500m due to the late recementation and compaction. argin but TypeⅡand TypeⅢin the Northwest Shelf of Australia，Mid-Norwaycontinental shelf and South Sea. |
| Keywords: Paleogene; Reservoir characteristics; Secondary pore; denudation; Controlling factor; Huizhou Depression |
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投稿时间：
2011-01-26 |
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