Influence of Early Carbonate Cementation on Porosity Evolution of Sandstones in the Zhujiang Formation, Enping Sag, Pearl River Mouth Basin
详细信息
- 责任者：Zhuo Xizhun (Department of Geology ; Liaoning Technical University ; Fuxin 123000 ; China) ; Wang Qi
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(4)
- 关键词：砂岩储集层 ; sandstone reservoirs ; 珠江口盆地 ; Zhujiangkou Basin
- 页码：p.26-30
- 图表：illus., 12 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
Early carbonate cements exist in the clastic reservoirs in the Enping sag,Pearl River Mouth Basin.An analysis of the impact of carbonate cementation on the evolution of reservoir pores can provide important information for reservoir prediction.Various data including thin section,cast thin section,SEM and mercury injection as well as petrophysical studies and logging interpretation were integrated to analyze the pore throat characteristics of the sandstones with early carbonate cementation in the Paleogene Zhujiang Formation in this study area.The calcareous sandstones with basal cementation have a "floating sand" texture and are of low porosity and low permeability reservoirs.In contrast,the calcareous sandstones with porous-type cementation are of high porosity and high permeability reservoirs with permeability commonly over 100 mD and average pore-throat radius over 15 μm.Based on the analysis of the diagenetic types of the Zhujiang Formation,the influences were discussed of the early carbonate cementation on the evolution of reservoir porosity and the influences were found to be positive or negative depending on the content of carbonates.For the tight calcareous sandstones with basal cementation,pore throats are generally poorly developed due to their strong resistance to dissolution.While for the calcareous sandstones with the porous-type cementation,the preservation of primary porosity and the generation of secondary porosity are easier,and large caverns can be formed due to the late dissolution of acidic fluids,resulting in high porosity and high permeability reservoirs.It is concluded that the marine sandstones with early carbonate cementation in the study area have strong compaction resistance and have the potential to form quality reservoirs under the dissolution of acidic fluids.
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