川中地区龙王庙组高频层序与沉积微相及其对有利储层的控制

高达; 胡明毅; 李安鹏; 杨威; 谢武仁; 孙春燕

doi:10.3799/dqkx.2020.382

Volume 46 Issue 10

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(10): 3520-3534

Gao Da, Hu Mingyi, Li Anpeng, Yang Wei, Xie Wuren, Sun Chunyan, 2021. High-Frequency Sequence and Microfacies and Their Impacts on Favorable Reservoir of Longwangmiao Formation in Central Sichuan Basin. Earth Science, 46(10): 3520-3534. doi: 10.3799/dqkx.2020.382

Citation:

Gao Da, Hu Mingyi, Li Anpeng, Yang Wei, Xie Wuren, Sun Chunyan, 2021. High-Frequency Sequence and Microfacies and Their Impacts on Favorable Reservoir of Longwangmiao Formation in Central Sichuan Basin. Earth Science, 46(10): 3520-3534. doi: 10.3799/dqkx.2020.382

Citation:

Gao Da, Hu Mingyi, Li Anpeng, Yang Wei, Xie Wuren, Sun Chunyan, 2021. High-Frequency Sequence and Microfacies and Their Impacts on Favorable Reservoir of Longwangmiao Formation in Central Sichuan Basin. Earth Science, 46(10): 3520-3534. doi: 10.3799/dqkx.2020.382

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High-Frequency Sequence and Microfacies and Their Impacts on Favorable Reservoir of Longwangmiao Formation in Central Sichuan Basin

doi: 10.3799/dqkx.2020.382

Gao Da^{1, 2
,},
Hu Mingyi^{1, 2},
Li Anpeng²,
Yang Wei³,
Xie Wuren³,
Sun Chunyan⁴

1.
Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China
2.
School of Geosciences, Yangtze University, Wuhan 430100, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China
4.
Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China

Received Date: 2020-06-21
Available Online: 2021-11-03
Publish Date: 2021-11-03

Abstract

Abstract

Based on seismic data, well-logging and cores, an integrated research on the microfacies and sequence stratigraphy and reservoir characteristics is made, in order to clarify the controls of the high-frequency sequence and microfacies on the reservoirs in the Longwangmiao Formaion, Central Sichuan basin. The Longwangmiao Formation is mainly composed of eight types of lithofacies such as ooid grainstone, intraclast grainstone and spotted-structure silt crystalline dolomite. They can be grouped into three types of facies associations which are deep-platform to inter-shoal, grain shoal, and restricted tidal flat. The Longwangmiao Formation consists of one third-order sequence and two fourth-order sequences, and either fourth-order sequence includes three to five fifth-order sequences. In the high-frequency sequence stratigraphic framework, tidal flat and grain shoal deposits show clear aggregation and southeastern progradation trends, and they are better developed in SQ2 than in SQ1. The fine to silt crystalline dolomite and spotted-structure silt crystalline dolomite that developed in restrict tidal flat are best in porosity, and they are mainly distributed in the upmost part of the fourth- and fifth-order sequences. The shoal deposits are the second best in reservoir quality and they mainly developed in the middle and upper parts of the sequences below the tidal flat. The early-stage dissolution related to high-frequency sea-level fluctuations is the basis for the formation of the best reservoir of the Longwangmiao Formation in the Central Sichuan basin, and laid the foundation for the later improvement.
- microfacies,
- microfacies association,
- high-frequency sequence,
- grain shoal,
- dolomite reservoir,
- Longwangmiao Formation,
- Sichuan basin,
- sedimentology

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References(64)

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High-Frequency Sequence and Microfacies and Their Impacts on Favorable Reservoir of Longwangmiao Formation in Central Sichuan Basin

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