Fluid Mobility Evaluation of Tight Sandstones in Chang 7 Member of Yanchang Formation, Ordos Basin

Songtao Wu; Shixiang Li; Xuanjun Yuan; Zhi Yang; Aifen Li; Jingwei Cui; Songqi Pan; Zhiguo Mao; Ling Su; You Zhou

doi:10.1007/s12583-020-1050-2

Volume 32 Issue 4

Aug 2021

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Journal of Earth Science > 2021 > 32(4): 850-862.

Songtao Wu, Shixiang Li, Xuanjun Yuan, Zhi Yang, Aifen Li, Jingwei Cui, Songqi Pan, Zhiguo Mao, Ling Su, You Zhou. Fluid Mobility Evaluation of Tight Sandstones in Chang 7 Member of Yanchang Formation, Ordos Basin. Journal of Earth Science, 2021, 32(4): 850-862. doi: 10.1007/s12583-020-1050-2

Citation:

Songtao Wu, Shixiang Li, Xuanjun Yuan, Zhi Yang, Aifen Li, Jingwei Cui, Songqi Pan, Zhiguo Mao, Ling Su, You Zhou. Fluid Mobility Evaluation of Tight Sandstones in Chang 7 Member of Yanchang Formation, Ordos Basin. Journal of Earth Science, 2021, 32(4): 850-862. doi: 10.1007/s12583-020-1050-2

Citation:

Songtao Wu, Shixiang Li, Xuanjun Yuan, Zhi Yang, Aifen Li, Jingwei Cui, Songqi Pan, Zhiguo Mao, Ling Su, You Zhou. Fluid Mobility Evaluation of Tight Sandstones in Chang 7 Member of Yanchang Formation, Ordos Basin. Journal of Earth Science, 2021, 32(4): 850-862. doi: 10.1007/s12583-020-1050-2

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Fluid Mobility Evaluation of Tight Sandstones in Chang 7 Member of Yanchang Formation, Ordos Basin

doi: 10.1007/s12583-020-1050-2

Songtao Wu^{1, 2, 3
,},
Shixiang Li⁴,
Xuanjun Yuan^{1, 2, 3},
Zhi Yang^{1
,
,
,},
Aifen Li⁵,
Jingwei Cui^{1, 2, 3},
Songqi Pan^{1
,
,
,},
Zhiguo Mao^{1, 2, 3},
Ling Su^{1, 2, 3},
You Zhou^{1, 2, 3, 6}

1.
Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
2.
Key Laboratory of Oil and Gas Reservoirs, CNPC, Beijing 100083, China
3.
National Energy Tight Oil and Gas R; D Center, Beijing 100083, China
4.
Changqing Oilfield Company, PetroChina, Xi'an 710000, China
5.
China University of Petroleum, Qingdao 266510, China
6.
School of Civil Engineering, Hebei University of Engineering, Handan 056000, China

More Information

Corresponding author: Zhi Yang, yangzhi2009@petrochina.com.cn; Songqi Pan, psq2017@petrochina.com.cn
Received Date: 03 Apr 2020
Accepted Date: 22 Jun 2020
Publish Date: 16 Aug 2021

Abstract

Abstract

Fluid mobility has been important topic for unconventional reservoir evaluation. The tight sandstones in Chang 7 Member of the Ordos Basin has been selected to investigate the fluid mobility based on the application of core flooding-NMR combined method and core centrifugation-NMR combined method, and the porous structure is studied using optical microscope, field emission scanning electron microscope (FE-SEM), CT and mercury injection. Our results include: (ⅰ) Feldspar-rock fragments dissolution pores, calcite dissolution pores, clay mineral dissolution pores, intergranular dissolution expansion pores, inter-granular pores, intra-kaolinite pores, and intra-illite/smectite mixed layer pores are developed in Chang 7 tight sandstones; 3D CT pore structure shows that the pore connectivity is positively related to physical properties, and the overall storage space is connected by the throat with diameter between 0.2 and 0.3 μm. The percentage of storage space connected by throats with diameter less than 100 nm can reach more than 35%. (ⅱ) Movable fluid saturation of Chang 7 tight sandstones is between 10% and 70%, and movable oil saturation is between 10% and 50%. Movable fluid saturation may cause misunderstanding when used to evaluate fluid mobility, so it is recommended to use movable fluid porosity in the evaluation of fluid mobility. The porosity ranging from 5% to 8% is the inflection point of the fluidity and pore structure. For samples with porosity less than 8%, the movable fluid porosity is generally less than 5%. Moreover, the movable fluid is mainly concentrated in the storage space with a throat diameter of 0.1 to 1 μm. For samples with porosity greater than 8%, the porosity of the movable fluid is more than 5%, and the movable fluid is mainly concentrated in the storage space with a throat diameter of 0.2 to 2 μm. (ⅲ) The movable fluid saturation measured by core flooding-NMR combined method is generally higher than that measured by core centrifugation-NMR combined method. The former can evaluate the mobility of the oil-water two-phase fluid in samples, while the latter can better reflect the pore structure and directly evaluate the movable fluid in the pore system controlled by different throat diameters. All these results will provide valuable reference for fluid mobility evaluation in tight reservoirs.
- tight oil,
- shale oil,
- unconventional petroleum accumulation,
- nano-pores,
- movable oil

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