Effects of large-foraminiferal shells on sandstone reservoir space and physical properties:Case study of the 1<sup>st</sup> member of Sanya Formation,Songnan Sag,Qiongdongnan Basin

Ma Zun-qing, Chen Guo-jun, Yang Hai-zhang, Li Chao, Zhao Yi-lin,

doi:10.11764/j.issn.1672-1926.2019.01.007

2019 , Vol. 30 >Issue 5: 712 - 720

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.01.007

Effects of large-foraminiferal shells on sandstone reservoir space and physical properties:Case study of the 1^st member of Sanya Formation,Songnan Sag,Qiongdongnan Basin

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1.Northwest Institute of Eco-environment and Resources,Lanzhou 730000,China;
2.Key Laboratory of Petroleum Resources,Gansu Province/Key laboratory of Petroleum Resources Research,Chinese Academy of Sciences,Lanzhou 730000,China;
3.University of Chinese Academy of Sciences,Beijing 100049,China;
4.CNOOC Research Institute,Beijing 100028,China

Received date: 2018-12-01

Revised date: 2019-01-20

Online published: 2019-05-29

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Abstract

Casting thin-sections,SEM and statistical methods were used to study on the effects of large- foraminiferal fossils on the reservoir space and physical properties of the 1st member of Sanya Formation fine-medium sandstone,2 565.00-2 576.23m in the Well S34,Songnan Sag,Qiongdongnan Basin.The analysis shows that the fine-medium sandstone in this section has the physical characteristics of medium-low porosity,low permeability and ultra-low permeability.Large foraminiferal shells have a special effect on the reservoir space and physical properties of sandstone.Their compaction resistance can reduce the damage of compaction to the pore of coelom cavity and the pore between shell lattices,and conserve 1%-4% of the pore of coelomic cavity in sandstone.However,the foraminiferal shell is large and its hardness is smaller than siliceous debris particles,compaction can make many debris particles around the shell embedded in the foraminiferal shell wall.Foraminiferal shell can seal the debris intergranular pore around the shell and affect its permeability.The stable carbon and oxygen isotope test results of carbonate cements show that the values of δ¹³C ranged from -2.050‰ to 0.243‰,the values of δ¹⁸O ranged from -9.700‰ to -7.624‰,and the values of Z(paleosalinity) ranged from 118.93 to 123.67,with an average value of 121.42.The formation temperature of carbonate cements ranged from 56.5℃ to 64.8℃,with an average of 62.2℃.The carbonate cements are characterized by marine diagenetic environment and early diagenetic stage.Considering the positive correlation of the content between the foraminifera and carbonate cements in thin slices and the distribution of carbonate cements near foraminiferal shells,the large foraminiferal shells provide abundant material sources for the formation of carbonate cements,and the strong cementation caused by them is an important reason for the poor physical properties of sandstones.

Key words： Large foraminifera shell; Reservoir space; Physical properties; Qiongdongnan Basin; The 1^st ; member of Sanya Formation; Sandstone

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Ma Zun-qing, Chen Guo-jun, Yang Hai-zhang, Li Chao, Zhao Yi-lin, . Effects of large-foraminiferal shells on sandstone reservoir space and physical properties:Case study of the 1^st member of Sanya Formation,Songnan Sag,Qiongdongnan Basin[J]. Natural Gas Geoscience, 2019 , 30(5) : 712 -720 . DOI: 10.11764/j.issn.1672-1926.2019.01.007

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