鄂尔多斯盆地湖盆中部长7<sub>3</sub>亚段深水砂质沉积特征及勘探前景

刘显阳; 郭雯; 刘江艳; 李士祥

doi:10.3799/dqkx.2022.446

Volume 48 Issue 1

Jan. 2023

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Liu Xianyang, Guo Wen, Liu Jiangyan, Li Shixiang, 2023. Characteristics and Exploration Prospects of Deep-Water Sandstone Reservoir of Chang 73 Sub-Member, Ordos Basin. Earth Science, 48(1): 279-292. doi: 10.3799/dqkx.2022.446

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Liu Xianyang, Guo Wen, Liu Jiangyan, Li Shixiang, 2023. Characteristics and Exploration Prospects of Deep-Water Sandstone Reservoir of Chang 7₃ Sub-Member, Ordos Basin. Earth Science, 48(1): 279-292. doi: 10.3799/dqkx.2022.446

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Characteristics and Exploration Prospects of Deep-Water Sandstone Reservoir of Chang 7₃ Sub-Member, Ordos Basin

doi: 10.3799/dqkx.2022.446

Liu Xianyang^{1, 2
,
,},
Guo Wen^{1, 3
,
,},
Liu Jiangyan^{1, 3},
Li Shixiang^{1, 3}

1.
National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China
2.
PetroChina Changqing Oilfield Company, Xi'an 710018, China
3.
Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an 710018, China

Received Date: 2022-04-12
Available Online: 2023-02-01
Publish Date: 2023-01-25

Abstract

Abstract

Thick organic-rich shale with thin silty sandstones is developed in Chang 7₃ Sub-member of Yanchang Formation in Ordos Basin. The sandstones in deep water environment are charged high intensity by source rocks and have a certain scale, which is an important target of deep water exploration in the basin. Based on the core, logging and test data of Chang 7₃ Sub-member, combined with the risk exploration practice of Lingye and Chiye horizontal wells, this paper discusses and analyzes the sedimentary and reservoir characteristics of deep-water sandy rocks in Chang 7₃ Sub-member. The results show that during the Chang 7₃ sedimentary period, the water body was deep, organic-rich shale was developed, the Qiqin orogenic belt in the southwest of the basin had frequent seismic and volcanic activities, and the source supply was sufficient, the rainfall was large and the lake level was rising. The gravity flow deposits of slump origin and flood origin were widely developed in the middle of the basin. Slope break belt controlled the development of deep-water gravity flow, the characteristics of deep-water gravity flow were controlled by the ancient landform and sedimentary microfacies, developing sliding-slump, sandy debris flow, hybrid event bed, turbidity current and density flow, such as slope break zone of slope toe, relatively rich ancient channel sand, sandy debris flow and turbidity current deposits are favorable reservoir types. The single sand body is thin, with an average thickness of 1 m, and is isolated or superimposed. In terms of spatial thickness, length and width, the combination of thick block single sand body and tightly continuous superimposed thin single sand body is the reservoir expected to be drilled. Shale with high R_o and high TOC is the material basis for sandy rock. Under high residual pressure difference, high-quality sandy "sweet spot" is most likely to appear in the source-reservoir configuration relationship between tightly stacked thin sandstone reservoir with better reservoir performance and interbedded high-quality source rock. The exploration potential of deep-water sandy rocks in Chang 7₃ Sub-member is good, so it is necessary to continuously explore the geophysical exploration technology of thin reservoir and the matched fracturing technology.
- deep-water sandy deposit,
- horizontal well,
- exploration potential,
- Chang 7₃ Sub-member,
- Ordos Basin,
- petroleum geology

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References(54)

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Characteristics and Exploration Prospects of Deep-Water Sandstone Reservoir of Chang 73 Sub-Member, Ordos Basin

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Characteristics and Exploration Prospects of Deep-Water Sandstone Reservoir of Chang 7₃ Sub-Member, Ordos Basin