Tight Reservoir Characteristics and Controlling Factors of Permian Lucaogou Formation in Yongfeng Sub-Sag, Chaiwopu Sag
Abstract
:1. Introduction
2. Regional Geological Condition
3. Lithology of the Tight Reservoir
3.1. Sample Collection and Analysis
3.2. Petrological Characteristics
3.3. Characteristics of Mineral Composition
3.4. Physical Properties of Reservoir
3.5. Types and Characteristics of Reservoir Space
3.5.1. Primary Pores
3.5.2. Secondary Dissolution Pores
3.5.3. Fractures
3.6. Reservoir Brittleness and Water Sensitivity
4. Controlling Factors of Reservoir
4.1. Impact of Sedimentary Facies on Reservoirs
4.2. Impact of Lithology on Reservoir
4.3. Impact of Diagenesis on Reservoir
4.4. Impact of Tectonic Movements and Fractures on Reservoir
5. Conclusions
- The Permian Lucaogou Formation in the study area can be divided into upper and lower lithological sections. The upper section develops a set of fan delta front facies siltstone deposits, mainly composed of lithic sandstone with low compositional maturity and poor reservoir physical properties. It is a tight sandstone reservoir with low porosity and low permeability. The reservoir space is mainly secondary pores, including intergranular dissolved pores, intragranular dissolved pores and fractures. The primary pores are severely damaged, and only residual intergranular pores are developed.
- The tight sandstone reservoir in the upper part of the Lucaogou Formation in the study area has high brittleness and low water sensitivity, which is very conducive to large-scale hydraulic fracturing to transform the reservoir and improve oil and gas production capacity.
- The development of tight reservoirs in the Lucaogou Formation in the study area is mainly controlled by sedimentary facies, lithology, diagenesis and later tectonic movement. These factors are interrelated in controlling reservoirs, but their magnitude of action varies. Sedimentary facies is the core controlling factor. Diagenesis has a decisive impact on the physical properties of the reservoir. Later tectonic movements and fractures have a significant impact on improving reservoir physical properties and seepage capacity.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Sample | Depth/m | Lithology | Porosity/% | Permeability/mD |
---|---|---|---|---|
1-1 | 1714.34 | Gray Fluorescent Argillaceous Silt-stone | 2.9 | 0.13 |
1-2 | 1715.15 | Gray Oil Stained Fine Sandstone | 1.9 | 0.019 |
1-3 | 1715.74 | Gray Oil Stained Gritstone | 3 | 0.024 |
2-1 | 1715.8 | Gray Oil Stained Gritstone | 4.7 | 0.038 |
2-2 | 1715.89 | Gray Oil Stained Gritstone | 4.9 | 0.03 |
1-4 | 1716.35 | Gray Oil Stained Fine Sandstone | 1.8 | 0.032 |
1-5 | 1716.73 | Gray Fluorescent Siltstone | 3.1 | 0.775 |
1-6 | 1717.84 | Gray Oil Spotted Fine Sandstone | 1.7 | 0.039 |
2-3 | 1718.82 | Gray Oil Spotted Fine Sandstone | 5.4 | 0.028 |
1-7 | 1719.12 | Gray Oil Spotted Fine Sandstone | 2 | 0.036 |
1-8 | 1720.04 | Gray Fluorescent Fine Sandstone | 3.7 | — |
1-9 | 1721.37 | Gray Oil Stained Fine Sandstone | 2.3 | 1.57 |
1-10 | 1721.63 | Gray Oil Immersed Fine Sandstone | 1.1 | 0.024 |
1-11 | 1722.33 | Gray Fluorescent Fine Sandstone | 1.4 | 0.023 |
1-12 | 1753.1 | Gray Fluorescent Siltstone | 1.4 | 0.031 |
1-13 | 1770.56 | Gray Fluorescent Fine Sandstone | 3.3 | 0.027 |
1-14 | 1772.24 | Gray Oil Stained Fine Sandstone | 4.9 | 0.686 |
1-15 | 1773.64 | Gray Oil Spotted Medium Sandstone | 7 | — |
1-16 | 1776.29 | Gray Oil Stained Fine Sandstone | 8 | 5.1 |
1-17 | 1777.1 | Gray Oil Immersed Glutenite | 11.8 | — |
2-4 | 1777.16 | Gray Oil Immersed Glutenite | 10.1 | — |
1-18 | 1779.2 | Gray Oil Stained Fine Sandstone | 7 | 2.09 |
1-19 | 1779.79 | Gray Oil Spotted Fine Sandstone | 8 | 15.5 |
1-20 | 1780.64 | Gray Fluorescent Fine Sandstone | 7.9 | — |
1-21 | 1999.32 | Gray Fluorescent Siltstone | 3.8 | — |
1-22 | 2000.94 | Light Gray Fluorescent Dolomite Fine Sandstone | 5.2 | — |
1-23 | 2004.08 | Light Gray Fluorescent Dolomite Fine Sandstone | 2.6 | — |
1-24 | 2008.1 | Gray Fluorescent Fine Sandstone | 4.9 | 0.524 |
Top Depth/m | Bottom Depth/m | Fracture Feature | Fracture Filling Degree | Oil and Gas Show of the Corresponding Core Section | ||
---|---|---|---|---|---|---|
Diagonal Fracture | Longitudinal Fracture | Cross Fracture | ||||
1714.34 | 1716.81 | 9 | 1 | 0 | Full Filled to Half-Filled | Fluorescence, Oil Stained |
1721.63 | 1725.08 | 14 | 1 | 0 | Full Filled to Half-Filled | Oil Immersion, Fluorescence |
1726.57 | 1729.59 | 12 | 0 | 0 | Full Filled | No Oil and Gas Show |
1730.52 | 1732.75 | 9 | 0 | 0 | Full Filled | No Oil and Gas Show |
1737.12 | 1743.26 | 0 | 2 | 0 | Half-Filled | Intermittent escape of pinpoint bubbles |
1744.62 | 1745.01 | 1 | 0 | 0 | Full Filled to Half-Filled | Intermittent escape of pinpoint bubbles |
1771.44 | 1777.51 | 17 | 5 | 1 | Full Filled to Half-Filled | Oil Stained, Oil Spotted, Oil Immersion |
1778.12 | 1780.76 | 3 | 0 | 0 | Full Filled to Half-Filled | Oil Stained, Oil Spotted, Fluorescence |
Sample | Well Depth (m) | Lithology | Relative Content of Clay Minerals/% | ||||
---|---|---|---|---|---|---|---|
Mixed Layer Illite/Smectite | Illite | Kaolinite | Chlorite | Ratio of Mixed Layer Illite/Smectite | |||
1-1 | 1714.34 | Gray Fluorescent Argillaceous Siltstone | 38 | 40 | 6 | 16 | 20 |
1-2 | 1715.15 | Gray Oil Stained Fine Sandstone | 42 | 39 | 5 | 14 | 20 |
1-4 | 1716.35 | Gray Oil Stained Fine Sandstone | 38 | 37 | 19 | 6 | 20 |
1-6 | 1717.84 | Gray Oil Spotted Fine Sandstone | 25 | 35 | 15 | 25 | 20 |
1-7 | 1719.12 | Gray Oil Spotted Fine Sandstone | 41 | 21 | 4 | 34 | 20 |
1-10 | 1721.63 | Gray Oil Immersed Fine Sandstone | 16 | 23 | 24 | 37 | 20 |
1-12 | 1753.1 | Gray Fluorescent Siltstone | 57 | 18 | 8 | 17 | 20 |
1-13 | 1770.56 | Gray Fluorescent Fine Sandstone | 25 | 25 | 15 | 35 | 20 |
1-15 | 1773.64 | Gray Oil Spotted Medium Sandstone | 38 | 45 | 6 | 11 | 20 |
1-17 | 1777.1 | Gray Oil Immersed sand-conglomerate | 24 | 38 | 16 | 22 | 20 |
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Wu, P.; Zhao, P.; Chen, Y.; Yang, H.; Yang, Y.; Dong, Q.; Chang, Y.; Wen, L.; Yuan, K.; Du, Y.; et al. Tight Reservoir Characteristics and Controlling Factors of Permian Lucaogou Formation in Yongfeng Sub-Sag, Chaiwopu Sag. Processes 2023, 11, 3068. https://doi.org/10.3390/pr11113068
Wu P, Zhao P, Chen Y, Yang H, Yang Y, Dong Q, Chang Y, Wen L, Yuan K, Du Y, et al. Tight Reservoir Characteristics and Controlling Factors of Permian Lucaogou Formation in Yongfeng Sub-Sag, Chaiwopu Sag. Processes. 2023; 11(11):3068. https://doi.org/10.3390/pr11113068
Chicago/Turabian StyleWu, Peng, Peihua Zhao, Yi Chen, Haixing Yang, Yun Yang, Qiu Dong, Yihang Chang, Lei Wen, Kun Yuan, Yukun Du, and et al. 2023. "Tight Reservoir Characteristics and Controlling Factors of Permian Lucaogou Formation in Yongfeng Sub-Sag, Chaiwopu Sag" Processes 11, no. 11: 3068. https://doi.org/10.3390/pr11113068
APA StyleWu, P., Zhao, P., Chen, Y., Yang, H., Yang, Y., Dong, Q., Chang, Y., Wen, L., Yuan, K., Du, Y., & Sun, X. (2023). Tight Reservoir Characteristics and Controlling Factors of Permian Lucaogou Formation in Yongfeng Sub-Sag, Chaiwopu Sag. Processes, 11(11), 3068. https://doi.org/10.3390/pr11113068