湖相碳酸盐岩天文旋回识别及优质储层发育特征和预测: 以西部凹陷雷家地区沙四段为例

户昶昊; 席振铢; 陈昌; 李阳

doi:10.3799/dqkx.2025.189

Volume 50 Issue 12

Dec. 2025

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Hu Changhao, Xi Zhenzhu, Chen Chang, Li Yang, 2025. Identification of Astronomical Cycles and Prediction of High-Quality Reservoir Development in Lacustrine Carbonates: A Case Study of the Fourth Member of Shahejie Formation in Leijia Area, Western Sag. Earth Science, 50(12): 4715-4735. doi: 10.3799/dqkx.2025.189

Citation:

Hu Changhao, Xi Zhenzhu, Chen Chang, Li Yang, 2025. Identification of Astronomical Cycles and Prediction of High-Quality Reservoir Development in Lacustrine Carbonates: A Case Study of the Fourth Member of Shahejie Formation in Leijia Area, Western Sag. Earth Science, 50(12): 4715-4735. doi: 10.3799/dqkx.2025.189

Citation:

Hu Changhao, Xi Zhenzhu, Chen Chang, Li Yang, 2025. Identification of Astronomical Cycles and Prediction of High-Quality Reservoir Development in Lacustrine Carbonates: A Case Study of the Fourth Member of Shahejie Formation in Leijia Area, Western Sag. Earth Science, 50(12): 4715-4735. doi: 10.3799/dqkx.2025.189

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Identification of Astronomical Cycles and Prediction of High-Quality Reservoir Development in Lacustrine Carbonates: A Case Study of the Fourth Member of Shahejie Formation in Leijia Area, Western Sag

doi: 10.3799/dqkx.2025.189

Hu Changhao^{1, 2
,
,},
Xi Zhenzhu¹,
Chen Chang^{2, 3},
Li Yang^{2
,
,
,}

1.
School of Geosciences and Info-physics, Central South University, Changsha 410083, China
2.
PetroChina Liaohe Oilfield Company, Panjin 124010, China
3.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China

Received Date: 2025-06-03
Publish Date: 2025-12-25

Abstract

Abstract

Multiple sets of lacustrine carbonate rocks are developed in the fourth member of the Shahejie Formation (Es₄) in the Leijia area of the western sag of the Liaohe Depression. With favorable geological conditions and promising resource potential, this interval currently serves as the primary target for tight oil exploration in the region. To clarify the characteristics of high-quality reservoirs and define exploration targets, this study integrates cyclostratigraphy, drilling, logging, seismic inversion, and analytical testing data to identify astronomical cycles and analyze reservoir properties, aiming to predict the distribution of high-quality "sweet spot" reservoirs. The main findings are as follows.(1) The Es₄ member contains approximately six long eccentricity cycles and nineteen short eccentricity cycles, and the relationship between long eccentricity cycles and oil-bearing intervals in the area is elucidated. (2) High-quality reservoirs in the Leijia area are dominated by dolomite, characterized by fine dolomite crystals (mostly 1-3 μm), well-developed intercrystalline pores and structural fractures, micropores mainly distributed in the 0.3-0.4 μm range, effective throat lengths ranging from 1 to 20 μm, and pore volumes primarily between 0.5-4.0 μm³. Light oil components are mainly hosted within fractures and intercrystalline pores. These tight and brittle dolomites are primarily developed within the Du-3 oil layer. (3) A single-well evaluation was conducted using a multi-parameter fusion method to establish reservoir evaluation criteria. Combined with pre-stack geological inversion data, the study clarified the distribution pattern of high-quality sweet spots within the sequence stratigraphic framework and carried out planar prediction. This research systematically refines the stratigraphy and sedimentary reservoir characteristics of lacustrine carbonates in the Es₄ member of the western sag, and effectively identifies sweet spot distribution using pre-stack seismic inversion, providing a robust geological basis for tight oil exploration in the area.
- lacustrine carbonate,
- astronomical cycles,
- high-quality reservoir,
- sweet spot prediction,
- western sag,
- petroleum geology

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References(94)

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Identification of Astronomical Cycles and Prediction of High-Quality Reservoir Development in Lacustrine Carbonates: A Case Study of the Fourth Member of Shahejie Formation in Leijia Area, Western Sag

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