Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of the 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin

HUANG Zheng; ZHOU Yongqiang; HE Zixiao; LI Ming; YANG Tao; WANG Su; LI Qiang; ZHAO Ying; YIN Shuai

doi:10.11781/sysydz202404845

Volume 46 Issue 4

Jul. 2024

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Article Navigation > PETROLEUM GEOLOGY & EXPERIMENT > 2024 > 46(4): 845-854

HUANG Zheng, ZHOU Yongqiang, HE Zixiao, LI Ming, YANG Tao, WANG Su, LI Qiang, ZHAO Ying, YIN Shuai. Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of the 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 845-854. doi: 10.11781/sysydz202404845

Citation:

HUANG Zheng, ZHOU Yongqiang, HE Zixiao, LI Ming, YANG Tao, WANG Su, LI Qiang, ZHAO Ying, YIN Shuai. Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of the 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 845-854. doi: 10.11781/sysydz202404845

Citation:

HUANG Zheng, ZHOU Yongqiang, HE Zixiao, LI Ming, YANG Tao, WANG Su, LI Qiang, ZHAO Ying, YIN Shuai. Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of the 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 845-854. doi: 10.11781/sysydz202404845

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Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of the 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin

doi: 10.11781/sysydz202404845

1.
Oil and Gas Development Management Department, SINOPEC Henan Oilfield Branch Company, Nanyang, Henan 473132, China
2.
No. 8 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710000, China
3.
Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

Received Date: 2023-07-18
Rev Recd Date: 2024-05-30
Publish Date: 2024-07-28

Abstract

Abstract

To elucidate the development patterns and influencing factors of natural fractures in deep-buried tight oil reservoirs, a comprehensive evaluation was conducted using a large amount of core samples, thin section, physical property data, imaging and conventional logging, water injection pressure testing and other data. The focus was on the tight oil reservoirs within the Ⅱ-Ⅵ oil layers of the third member of the Paleogene Hetaoyuan Formation in the southeastern An'peng area of the Biyang Depression, Nanxiang Basin. These oil formations, deposited in fan-delta front environment, are characterized by a high content of rock debris, indicating proximal deposition. A strong positive correlation between reservoir porosity and permeability was observed. Among the various sandstone lithologies, fractures predominantly developed in fine sandstone, followed by siltstone, while gravelly sandstone generally lacked fractures. High-angle and vertical fractures were predominant, constituting 87.8% of the total, while low-angle oblique and horizontal fractures accounted for 7.3% and 4.9%, respectively. The main controlling factors for fracture development in these tight reservoirs included lithology, depositional microfacies, and local structures. Thin and fine-grained single or composite sand bodies typically had more deve-loped fractures, particularly in front channel, channel flank, mouth bar, and outer edge of distal bars. Conversely, fractures were less developed in sheet sands or delta front microfacies. Moreover, fractures primarily formed at structural inflection points, predominantly at the tops and wings of forward structures and were primarily oriented along the WE and NE directions, followed by the NW direction. These fractures predominantly formed during the Neogene depression period (late Himalayan). Fractures significantly influence water channeling in tight oil reservoirs, necessitating enhanced dynamic and static monitoring of the degree, extent, and orientation of fracture development.
- fracture,
- tight oil,
- Hetaoyuan Formation,
- Paleogene,
- southeast An'peng area,
- Biyang Sag,
- Nanxiang Basin

All authors disclose no relevant conflict of interests.
HUANG Zheng and YIN Shuai participated in the writing and revision of the article. ZHOU Yongqiang and HE Zixiao provided revision suggestions. LI Ming, YANG Tao and WANG Su provided samples and data support. LI Qiang and ZHAO Ying participated in the design and discussion of the article. All authors have read the last version of the paper and consented to its submission.

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References(26)

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Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of the 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin

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Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of the 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin

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