Multisourced CO<sub>2</sub> Injection in Fan Delta Conglomerates and Its Influence on Reservoir Quality: Evidence from Carbonate Cements of the Baikouquan Formation of Mahu Sag, Junggar Basin, Northwestern China

Ning Zhu; Yingchang Cao; Kelai Xi; Songtao Wu; Rukai Zhu; Miaomiao Yan; Shunkang Ning

doi:10.1007/s12583-020-1360-4

Volume 32 Issue 4

Aug 2021

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Journal of Earth Science > 2021 > 32(4): 901-918.

Ning Zhu, Yingchang Cao, Kelai Xi, Songtao Wu, Rukai Zhu, Miaomiao Yan, Shunkang Ning. Multisourced CO2 Injection in Fan Delta Conglomerates and Its Influence on Reservoir Quality: Evidence from Carbonate Cements of the Baikouquan Formation of Mahu Sag, Junggar Basin, Northwestern China. Journal of Earth Science, 2021, 32(4): 901-918. doi: 10.1007/s12583-020-1360-4

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Ning Zhu, Yingchang Cao, Kelai Xi, Songtao Wu, Rukai Zhu, Miaomiao Yan, Shunkang Ning. Multisourced CO₂ Injection in Fan Delta Conglomerates and Its Influence on Reservoir Quality: Evidence from Carbonate Cements of the Baikouquan Formation of Mahu Sag, Junggar Basin, Northwestern China. Journal of Earth Science, 2021, 32(4): 901-918. doi: 10.1007/s12583-020-1360-4

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Multisourced CO₂ Injection in Fan Delta Conglomerates and Its Influence on Reservoir Quality: Evidence from Carbonate Cements of the Baikouquan Formation of Mahu Sag, Junggar Basin, Northwestern China

doi: 10.1007/s12583-020-1360-4

Ning Zhu^1
,,
Yingchang Cao^{1
,
,
,},
Kelai Xi¹,
Songtao Wu^{2, 3, 4},
Rukai Zhu^{2, 3, 4},
Miaomiao Yan¹,
Shunkang Ning⁵

1.
School of Geosciences, China University of Petroleum, Qingdao 266580, China
2.
Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
3.
Key Laboratory of Oil and Gas Reservoirs, CNPC, Beijing 100083, China
4.
National Energy Tight Oil and Gas R; D Center, Beijing 100083, China
5.
Wenliu Oil Recovery Plant of Zhongyuan Oilfield Branch, Puyang 457000, China

More Information

Corresponding author: Yingchang Cao, sydxcyc@qq.com
Received Date: 01 Nov 2019
Accepted Date: 18 Jun 2020
Publish Date: 16 Aug 2021

Abstract

Abstract

Sandy-conglomerate reservoir has gradually become a major target of oil and gas exploration. Complex diagenetic process and diagenetic fluid play a significant role in affecting reservoir heterogeneity. Carbonate cements form at various stages of the diagenesis process and record various geological fluid information. Recently, one-billion-ton sandy conglomerate oil field was exposed in Triassic Baikouquan Formation, Mahu sag, Junggar Basin. Therefore, an integrated study applying casting thin sections, cathodeluminescence, fluorescence, carbon and oxygen stable isotopes, electronic probe microanalysis and aqueous fluid inclusions measurements was performed in order to identify the types of carbonate mineral and its representative diagenetic environment and discuss the influences of different CO₂ injections on reservoir quality. The main findings are as follows: The reservoir is mainly composed of 70.33% conglomerate and 16.06% coarse-grained sandstone. They are characterized by low compositional maturity and abundant lithic debris. Four types carbonate cements are identified according to the petrological and geochemical characteristics, including two types of Mn-rich calcite, ferroan calcite, siderite and dawsonite. They display an unusual broad spectrum of δ¹³C values (-54.99‰ to +8.8‰), suggesting both organic and inorganic CO₂ injections. The δ¹³C values of siderite are close to 0, and its formation is related to meteoric water. The δ¹³C values of ferroan calcite and the occurrence of dawsonite indicate the trace of inorganic mantle-derived magmatic fluids. The δ¹³C values and trace elements of Mn-rich calcite record the information of hydrocarbon-bearing fluids. The fluid inclusions measurement data and reservoir properties and oil-test data show that the oil content of reservoir is not only affected by the formation time of different cements, but also by the relative content of dissolution and cementation. For these reservoirs altered by carbonate cements, it does not cause poor oil-bearing due to blockage of secondary minerals.
- carbonate cement,
- CO₂ fluid,
- carbon and oxygen isotope,
- reservoir,
- Mahu sag,
- Junggar Basin

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References(80)

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