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Dissolution of Different Reservoir Rocks by Organic Acids in Laboratory Simulations: Implications for the Effect of Alteration on Deep Reservoirs

文献类型：期刊论文

作者Chen, Jian2,3; Xu, Jie1,2,3; Wang, Susu1,2,3; Sun, Zhenyu1,2,3; Li, Zhong1,4; Jia, Wanglu2,3; Peng, Ping'an1,2,3
刊名GEOFLUIDS
出版日期2021-03-23
卷号2021页码:16
ISSN号1468-8115
DOI10.1155/2021/6689490
英文摘要Organic acids are important agents in the alteration of deep reservoirs. It is difficult, however, to assess the impact of organic acid alteration on deep reservoirs because different dissolution processes may occur during diagenesis. This study simulated the dissolution of three different types of reservoir rocks by acetic acid in a closed system and compared the mineral and elemental composition, surface morphology, pore structure, and water chemistry variations of the initial and altered samples. The study demonstrated that both micrite and sucrosic dolostone are strongly dissolved, losing about 20%-30% of their initial rock sample weights. Observation under SEM showed that the limestone dissolved homogenously, whereas the dolostone showed honeycomb-like dissolution. Both carbonate samples showed the development of large voids, including holes and cavities of micrometer scale, but nanopores of various sizes were blocked. In contrast, lithic arkose was heterogeneously altered, losing a weight proportion of about 13% by dissolution of calcite cement. These micrometer-scale microfissures were developed, but those nanometer-scale pores just varied in a narrow range of sizes. The volume increase in all three reservoir types is mainly attributed to the dissolution of carbonate minerals. In deep reservoirs, in situ generated organic acids can enlarge existing cavities in carbonates and develop microfissures in sandstones. The microfissure porosity in sandstone is limited but can increase through other geological processes such as overpressure. More importantly, these acids can maintain the acidity of pore waters, inhibit the precipitation of dissolved minerals, and help to preserve reservoir porosity. Although temperature plays an insignificant role in laboratory simulations, it influences both the generation and destruction processes of organic acids in deep reservoirs on geologic time scales and, thus, warrants further attention. The results provide a basis for recognizing the typical patterns of organic acid dissolution on different reservoir rocks and further suggest the potential role of organic acids in the formation and preservation of secondary porosity in deeply buried reservoirs.
资助项目National Science and Technology Major Project of China[2017ZX05008-003-022] ; State Key Laboratory of Organic Geochemistry[SKLOG2020-1]
WOS研究方向Geochemistry & Geophysics ; Geology
语种英语
WOS记录号WOS:000637364700001
出版者WILEY-HINDAWI
资助机构National Science and Technology Major Project of China ; National Science and Technology Major Project of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry ; National Science and Technology Major Project of China ; National Science and Technology Major Project of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry ; National Science and Technology Major Project of China ; National Science and Technology Major Project of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry ; National Science and Technology Major Project of China ; National Science and Technology Major Project of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry
源URL[http://ir.iggcas.ac.cn/handle/132A11/101095]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Chen, Jian
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem SKLOG, Guangzhou 510640, Peoples R China
3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Jian,Xu, Jie,Wang, Susu,et al. Dissolution of Different Reservoir Rocks by Organic Acids in Laboratory Simulations: Implications for the Effect of Alteration on Deep Reservoirs[J]. GEOFLUIDS,2021,2021:16.
APA Chen, Jian.,Xu, Jie.,Wang, Susu.,Sun, Zhenyu.,Li, Zhong.,...&Peng, Ping'an.(2021).Dissolution of Different Reservoir Rocks by Organic Acids in Laboratory Simulations: Implications for the Effect of Alteration on Deep Reservoirs.GEOFLUIDS,2021,16.
MLA Chen, Jian,et al."Dissolution of Different Reservoir Rocks by Organic Acids in Laboratory Simulations: Implications for the Effect of Alteration on Deep Reservoirs".GEOFLUIDS 2021(2021):16.

入库方式： OAI收割

来源：地质与地球物理研究所

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