Published

2018-04-01

Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China

Controles diagenéticos en yacimientos de arenisca compacta: estudio de caso de las areniscas Chang 7, en la Formación Yanchang, Triásico Superior, cuenca de Ordos, China

DOI:

https://doi.org/10.15446/esrj.v22n2.72251

Keywords:

Diagenesis, tight sandstone, reservoir quality, Ordos Basin, (en)
Diagénesis, arenisca apretada, calidad del yacimiento, Cuenca de Ordos, (es)

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Authors

  • Haihua Zhu 1 Stake Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500,China
  • Guangchen Liu 1 Stake Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500,China
  • Dakang Zhong School of Earth Science, China University of Petroleum (Beijing), Beijing 102249, China
  • Tingshan Zhang 1 Stake Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500,China
  • Jun Lang 1 Stake Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500,China
  • Jingli Yao Exploration & Development Research Institute of PetroChina Changqing Oil Field Company, Xi’an 710018, China

Through a range of petrological techniques, the petrology, diagenesis, pore characteristics, and controlling factors on the regional variations of reservoir quality of the Chang 7 sandstones were studied. These sandstones, mainly arkoses, lithic arkoses, and feldspathic litharenites, were deposited in a delta front and turbidites in semi-deep to deep lacustrine. The detrital constituents were controlled by the provenance and sedimentary condition, which resulted in a spatially variable composition; e.g., high biotite and feldspar contents in the northeast (NE) of the study area, and high contents of rock fragments, especially dolomite, matrix, and quartz in the southwest (SW). Diagenesis includes intense mechanical compaction, cementation, and dissolution of unstable minerals. Diagenetic minerals which were derived internally include quartz, ankerite, ferrous calcite, albite, illite, kaolinite, and chlorite. Thus the original sandstone composition hadfirm control over the development and distribution of cement. Mechanical compaction and late-stage cementations contribute to the porosity loss of sandstones of Chang7 member. The dissolution porosity in major sandstone, slightly higher than primary porosity is principally dependent on the accessibility of acid fluid. The high content of plastic component facilitated the reduction of primary porosity and limited the mineral dissolution. The best reservoir sandstones are found in W, and partly from NE, M districts, with porosity are primary. The relatively high textural maturity of these sandstones reduces the impact of compaction on primary pores, and commonly existed chlorite rims limited the precipitation of pore filling quartz and carbonate cementation in late stage.

A través de una gama de técnicas petrológicas se estudió la petrología, la diagénesis, las características de poro y los factores que controlan las variaciones regionales de la calidad del yacimiento de las areniscas Chang 7. Estas areniscas, principalmente arcosas, arcosas líticas y arenitas líticas feldespáticas, se depositaron en un frente deltáico mientras las turbiditas se depositaron en ambientes lacustres profundos y semi-profundos. Los componentes detríticos dependen de la procedencia y la condición sedimentaria, lo que resultó en una composición variable en el espacio; por ejemplo, altos contenidos de biotita y feldespato en el noreste (NE) del área de estudio, y altos contenidos de fragmentos de roca, especialmente dolomita, matriz y cuarzo en el suroeste (SW). La diagénesis incluye compactación mecánica intensa, cementación y disolución de minerales inestables. Los minerales diagenéticos que se derivaron internamente incluyen cuarzo, ankerita, calcita ferrosa, albita, illita, caolinita y clorita. Por lo tanto, la composición original de arenisca tenía un firme control sobre el desarrollo y la distribución del cemento. La compactación mecánica y las cementaciones de la última etapa contribuyen a la pérdida de porosidad de las areniscas del miembro Chang7. La porosidad de disolución en la piedra arenisca principal, ligeramente más alta que la porosidad primaria, depende principalmente de la accesibilidad del fluido ácido. El alto contenido de componentes plásticos facilitó la reducción de la porosidad primaria y limitó la disolución del mineral. Las mejores areniscas de yacimiento se encuentran en los distritos Occidental, y en parte de los distritos Noroeste y Medio, con niveles primarios de porosidad. La madurez textural relativamente alta de estas areniscas reduce el impacto de la compactación en los poros primarios, y los bordes de clorito comúnmente existentes limitaron la precipitación del cuarzo de llenado de poros y la cementación de carbonato en la etapa tardía.

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How to Cite

APA

Zhu, H., Liu, G., Zhong, D., Zhang, T., Lang, J. and Yao, J. (2018). Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China. Earth Sciences Research Journal, 22(2), 129–138. https://doi.org/10.15446/esrj.v22n2.72251

ACM

[1]
Zhu, H., Liu, G., Zhong, D., Zhang, T., Lang, J. and Yao, J. 2018. Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China. Earth Sciences Research Journal. 22, 2 (Apr. 2018), 129–138. DOI:https://doi.org/10.15446/esrj.v22n2.72251.

ACS

(1)
Zhu, H.; Liu, G.; Zhong, D.; Zhang, T.; Lang, J.; Yao, J. Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China. Earth sci. res. j. 2018, 22, 129-138.

ABNT

ZHU, H.; LIU, G.; ZHONG, D.; ZHANG, T.; LANG, J.; YAO, J. Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China. Earth Sciences Research Journal, [S. l.], v. 22, n. 2, p. 129–138, 2018. DOI: 10.15446/esrj.v22n2.72251. Disponível em: https://revistas.unal.edu.co/index.php/esrj/article/view/72251. Acesso em: 24 apr. 2024.

Chicago

Zhu, Haihua, Guangchen Liu, Dakang Zhong, Tingshan Zhang, Jun Lang, and Jingli Yao. 2018. “Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China”. Earth Sciences Research Journal 22 (2):129-38. https://doi.org/10.15446/esrj.v22n2.72251.

Harvard

Zhu, H., Liu, G., Zhong, D., Zhang, T., Lang, J. and Yao, J. (2018) “Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China”, Earth Sciences Research Journal, 22(2), pp. 129–138. doi: 10.15446/esrj.v22n2.72251.

IEEE

[1]
H. Zhu, G. Liu, D. Zhong, T. Zhang, J. Lang, and J. Yao, “Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China”, Earth sci. res. j., vol. 22, no. 2, pp. 129–138, Apr. 2018.

MLA

Zhu, H., G. Liu, D. Zhong, T. Zhang, J. Lang, and J. Yao. “Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China”. Earth Sciences Research Journal, vol. 22, no. 2, Apr. 2018, pp. 129-38, doi:10.15446/esrj.v22n2.72251.

Turabian

Zhu, Haihua, Guangchen Liu, Dakang Zhong, Tingshan Zhang, Jun Lang, and Jingli Yao. “Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China”. Earth Sciences Research Journal 22, no. 2 (April 1, 2018): 129–138. Accessed April 24, 2024. https://revistas.unal.edu.co/index.php/esrj/article/view/72251.

Vancouver

1.
Zhu H, Liu G, Zhong D, Zhang T, Lang J, Yao J. Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China. Earth sci. res. j. [Internet]. 2018 Apr. 1 [cited 2024 Apr. 24];22(2):129-38. Available from: https://revistas.unal.edu.co/index.php/esrj/article/view/72251

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