Porosity Enhancement Potential through Mineral Dissolution by Organic Acids in the Diagenetic Process of Clastic Reservoir
详细信息
- 责任者：Yuan Guanghui (School of Geosciences ; China University of Petroleum ; Qingdao 266555 ; China) ; Cao Yingchang
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(5
- 关键词：碎屑岩储集层 ; clastic reservoirs ; 有机酸 ; organic acids ; 溶蚀作用 ; dissolution
- 页码：p.207-219
- 图表：7 illus., 3 tables, 62 refs.
- 分类号：1003
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
In the diagenetic process of clastic reservoirs,organic matters in source rock can release large amounts of organic acids during the thermal evolution process.The hypothesis that these organic acids can strongly corrode aluminum silicate minerals and carbonate minerals to create secondary pores of certain scale is prevalent in petroleum geologists.On the basis of worldwide experimental data of pyrolysis of organic matter,the author calculated the organic acid production potential of unit mass of kerogen.Taking the northern steep slope of Dongying Sag as an example,shale/sand ratio,abundance of organic matter and organic acid production-expulsion potential of main source rock were calculated. With these parameters,porosity enhancement potential for reservoirs through dissolution of aluminum silicate minerals and carbonate minerals by organic acids expulsed from source rock was calculated.Then,with the concentration of organic acids in worldwide oil and gas reservoir formation water as reference,combining with the water-rock reaction experiment,matching relationship between mass dissolution of carbonate minerals and supply capacity of acid formation fluid was analyzed.The result shows that without faults and unconformity as dominant migration pathway,secondary porosity created by dissolution of aluminum silicate minerals by organic acids released through thermal evolution of organic matters can reach as much as 4.49%-7.48%,which is in consistent with existing cognition in some extent.However,secondary porosity created by dissolution of carbonate minerals is at most 1.54%-2.56%,which is much less than the subjective perception of most scholars.Without convincing evidence,the idea that large amounts of intergranular porosity in mid-deep buried anomalously high porosity reservoir should be the secondary porosity produced by the dissolution of the early carbonate cement is fairly questionable.
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