Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin

GAO Mengtian; LU Yongchao; DU Xuebin; MA Yiquan; ZHANG Jingyu; DENG Kong

doi:10.11781/sysydz2021061097

Volume 43 Issue 6

Nov. 2021

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Article Navigation > PETROLEUM GEOLOGY & EXPERIMENT > 2021 > 43(6): 1097-1106

GAO Mengtian, LU Yongchao, DU Xuebin, MA Yiquan, ZHANG Jingyu, DENG Kong. Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(6): 1097-1106. doi: 10.11781/sysydz2021061097

Citation:

GAO Mengtian, LU Yongchao, DU Xuebin, MA Yiquan, ZHANG Jingyu, DENG Kong. Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(6): 1097-1106. doi: 10.11781/sysydz2021061097

Citation:

GAO Mengtian, LU Yongchao, DU Xuebin, MA Yiquan, ZHANG Jingyu, DENG Kong. Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2021, 43(6): 1097-1106. doi: 10.11781/sysydz2021061097

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Multi-factor evaluation for fine grading of tight sandstone reservoirs: a case study from H3 sand group in the upper section of Oligocene Huagang Formation, Xihu Sag, East China Sea Basin

doi: 10.11781/sysydz2021061097

GAO Mengtian^{1, 2
,},
LU Yongchao²,
DU Xuebin³,
MA Yiquan⁴,
ZHANG Jingyu^{2, 3},
DENG Kong^{2, 3}

1.
Hainan Branch, CNOOC, Haikou, Hainan 570312, China
2.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China
3.
College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China
4.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China

Received Date: 2021-04-08
Rev Recd Date: 2021-08-20
Publish Date: 2021-11-28

Abstract

Abstract

The H3 sand group of the upper section of the Oligocene Huagang Formation in the western sub-sag of the Xihu Sag of the East China Sea Continental Shelf Basin is a tight sandstone reservoir with low porosity and low or ultra-low permeability. The distribution of high-quality reservoirs has become a key factor restricting productivity. Based on coring, well logging and physical property test data, the sedimentary microfacies and physical properties of the H3 sand group were studied, and a fine grading evaluation and "sweet spot" prediction were carried out. The reservoir distribution in the H3 sand group was mainly affected by four factors: structural characteristics, sedimentary microfacies, sand thickness and conditions of porosity and permeability. Moreover, on the basis of comprehensive analysis of the relationship among these factors and gas saturation, a four-factor reservoir fine grading evaluation method was proposed. The H3 sand group reservoirs were divided into three types: "sweet spot" reservoirs (type Ⅰ), medium reservoirs (type Ⅱ) and ineffective reservoirs (type Ⅲ).The H3-3 single sand layer has a great exploration potential, followed by the H3-1, H3-2 and H3-4 single sand layers.
- reservoir evaluation,
- reservoir grading,
- H3 sand group,
- upper section of Huagang Formation,
- Oligocene,
- Xihu Sag,
- East China Sea Basin

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References(34)

References

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沈阳化工大学材料科学与工程学院沈阳 110142

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