Study on reservoir characteristics of Chang2 reservoir in southwest Ordos Basin

Authors

  • Xuandu Fan
  • Jiaxuan Ma
  • Xingjian Ren

DOI:

https://doi.org/10.62051/ijepes.v1n1.02

Keywords:

Reservoir characteristics, Pore structure, Mercury injection, Chang 2 oil formation, Ordos basin

Abstract

In order to clarify the reservoir characteristics of the Chang2 oil formation in the GQ block of the Ordos Basin, the reservoir characteristics and pore structure of the Long 2 oil formation in the study area were investigated using experimental data such as cast thin section, scanning electron microscope (SEM) and mercury pressure curve. The results show that the Chang2 oil formation in the study area mainly develops medium sandy fine-grained feldspathic sandstone, and the pore types are rock dissolution pores and intergranular pores. The reservoirs of the Chang2 oil formation group in the study area were evaluated and classified by applying piezomercury curve banding, and the reservoirs were classified into three categories: Small pore-medium fine-throat type-medium pore-medium fine-throat type, Fine pore-micro-throat type and Mesoporous-coarse throat type. In the study area, most of the reservoirs in Chang2 are Small pore-medium fine-throat type-medium pore-medium fine-throat type, accounting for 50% of the total, while Mesoporous-coarse throat type accounts for 34.7% and Fine pore-micro-throat accounts for 15.3% of the total. The Chang2 oil reservoir in the study area is mainly developed as a general reservoir.

References

YANG H, LI S X, LIU X Y. Characteristics and resource prospects of tight oil and shale oil in Ordos Basin [J]. Acta Petrolei Sinica, 2013,34(1): 1-11.

LI G X, ZHU R K. Progress, challenges and key issues of unconventional oil and gas development of CNPC[J]. China Petroleum Exploration, 2020, 25(2): 1-13.

SUN L D, ZOU C N, JIA A L, et al. Development characteristics and orientation of tight oil and gas in China[J]. Petroleum Exploration and Development, 2019, 46(6): 1015-1026.

WU H, ZHANG C L, JI Y L, et al. Pore-throat size characterization of tight sandstone and its control on reservoir physical properties:Acase study of Yanchang Formation,eastern Gansu,Ordos Basin[J]. Acta Petrolei Sinica, 2017, 38(8): 876- 887.

QU H J, YANG X C, CAO J Z, et al. Oil accumulation rules in deep zones of Upper Triassic Yanchang Formation in Ordos Basin[J]. Acta Petrolei Sinica, 2011, 32(2): 243-248.

ZHANG C L, LIU X S, YANG Y J, et al. Petroleum exploration history and enlightenment of Changqing Oilfield in Ordos Basin[J]. Xinjiang Petroleum Geology, 2021, 42(3): 253-263.

Ma Y, Li W H, Liu Z, et al. Characteristics of microscopic pore structure in the low permeability sandstone reservoir: A case study of Chang 9 of Yanchang Formation in Zhijing-Ansai area of Ordos Basin[J]. Geological Bulletin of China, 2016, 35(2/3):398-405.

DAI Q Q, LUO Q, ZHANG C, et al. Pore structure characteristics of tight-oil sandstone reservoir based on a new parameter measured by NMR experiment: A case study of seventh member in Yanchang Formation, Ordos Basin[J]. Acta Petrolei Sinica, 2016, 37(7):887-897.

Downloads

Published

30-12-2023

Issue

Section

Articles

How to Cite

Fan, X., Ma, J., & Ren, X. (2023). Study on reservoir characteristics of Chang2 reservoir in southwest Ordos Basin. International Journal of Electric Power and Energy Studies, 1(1), 9-19. https://doi.org/10.62051/ijepes.v1n1.02