准噶尔盆地车拐斜坡区储层碳酸盐胶结物碳氧同位素特征及其成因

doi:10.13809/j.cnki.cn32-1825/te.2020.04.016

Abstract

Abstract:

It is of great significance to clarify the formation mechanism of carbonate cementation and its influence on reservoir physical properties. By means of petrology and geochemistry, the occurrence characteristics and formation mechanism of carbonate cements in Cegai slope of Junggar Basin are analyzed. The results show that the distribution range of δ ¹³C_PDB value is -29.6 ‰~6.7 ‰, that of δ ¹⁸O_PDB value is -12.5 ‰~19.2 ‰, and it has a large span. All those indicate the material source of carbonate cementation and the complexity of water-rock interaction. δ ¹³C_PDB value has a positive offset with the typical marine or lacustrine phase of carbonate, while δ ¹⁸O_PDB value has the negative offset. The positive offset of δ ¹³C_PDB value is mainly affected by the carbon isotope fractionation of mixed hydrothermal fluid and the dissolution of a small amount of sedimentary carbonate. The negative deviation of δ ¹⁸O_PDB value may be caused by the mixing of various fluids—such as precipitation and deep hydrothermal—and the rise of diagenetic temperature. The material source of carbonate cements in Che-Guai slope is related to the CO₂ produced by the decarboxylation of organic acids, compaction and drainage of clay minerals, the dissolution of feldspar debris and the release of a large amount of plasma like Ca ²⁺, Fe ³⁺ and Mg ²⁺ by conversion among clay minerals. Under the microscope, it is found that the carbonate cements are metasomatic to detrital particles and accompanied by asphaltene appearance, and appear in the form of crystal powder to macrocrystalline grain among the closely arranged clastic particles, as a product of late diagenetic stage, which destroy the physical properties of reservoirs.

Key words: Che-Guai slope area, carbonate cement, carbon and oxygen isotope, material source, reservoir physical properties

CLC Number:

TE122

CHEN Bo,ZHANG Shuncun,SUN Guoqiang,SHI Ji’an,WU Tao. Characteristics and formation mechanism of Carbonate cementation in Che-Guai slope area, Junggar Basin[J].Reservoir Evaluation and Development, 2020, 10(4): 101-106.

Figures/Tables 5

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井号	层位	δ¹³C_PDB/‰	δ¹⁸O_PDB/‰	δ¹⁸O_SMOW/‰	古温度/℃
G202	J₁s	-4.3	-13.5	16.94	94.3
G202	J₁s	-2.7	-15.9	14.47	111.8
G202	J₁s	-0.8	-14.8	15.60	103.6
G101	J₁b	-21.7	-12.5	17.97	87.3
C501	J₁b	3.2	-15.3	15.09	107.3
G202	J₁b	-11.3	-14.0	16.43	97.8
G202	J₁b	-10.9	-13.9	16.53	97.1
G202	J₁b	-8.2	-14.9	15.50	104.4
G202	J₁b	-9.2	-14.2	16.22	99.3
G201	J₁b	6.7	-15.7	14.68	110.3
G202	J₁b	-4.9	-18.1	12.20	128.9
G202	J₁b	-8.4	-16.9	13.44	119.5
G9	T₂k	-29.6	-16.3	14.06	114.9
G10	T₂k	-22.2	-18.7	11.58	133.8
G4	T₂k	-15.1	-19.2	11.07	137.9
G202	T₁b	0.3	-15.5	14.88	108.8

Characteristics and formation mechanism of Carbonate cementation in Che-Guai slope area, Junggar Basin

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