Characteristics and controlling factors of deep-seated reservoir: a case study from the Fukang Sag of Junggar Basin

Abstract

The characteristics and formation mechanism of clastic reservoirs have a significant impact on petroleum accumulation in the deep-seated strata of sedimentary basins. Newly drill data indicate that the tight reservoirs in the lower slop of Fukang Sag in the Junggar Basin produce a lot of oil despite being buried extremely deep and with low porosity. By using lithological and geochemical studies, we investigated the formation of these deep-seated reservoirs through the comparison between upper and lower slopes. The results suggest that the reservoir of lower slop is highly compacted and has weaker dissolution than the reservoir in the upper slope. Dissolution and micro fractures are the key factors in determining the formation of deep-seated reservoirs. The fluids that caused the dissolution of reservoir can be divided into three stages and sourced from the mixture of deep and basin fluids. A model of reservoir formation and evolution has been set up. Our research could provide an insight for the formation of deep-seated reservoirs in similar geological conditions worldwide.

Graphical abstract

Keywords

Junggar Basin / Fukang Sag / Wuerhe Formation / reservoir / evolution

References

[1] Amel H, Jafarian A, Husinec A, Koeshidayatullah A, Swennen R (2015). Microfacies, depositional environment and diagenetic evolution controls on the reservoir quality of the Permian Upper Dalan Formation, Kish Gas Field, Zagros Basin.Mar Pet Geol, 67: 57–71

[2] Armitage P J, Worden R H, Faulkner D R, Aplin A C, Butcher A R, Iliffe J (2010). Diagenetic and sedimentary controls on porosity in Lower Carboniferous fine-grained lithologies, Krechba Field, Algeria: a petrological study of a caprock to a carbon capture site.Mar Pet Geol, 27(7): 1395–1410

[3] Cao J J, Luo J L, Madina M, Sheng W Y, Yu S H, Fu Y, Wang Z, Shi X F (2022). Influence of differential sedimentary-diagenetic evolution on the densification of the sandy conglomerate reservoir: a case study of the Permain Upper Wuerhe formation in eastern Junggar Basin.J China Univ Min Technol, 51(5): 926–943

[4] Chen S P, Zhang Y W, Tang L J (2001). Evolution of Junggar late Carboniferous-Permian foreland basin.J China Univ Petrol (Ed Nat Sci), 25(5): 11–15

[5] Chen S R, Wang W X, Qu X Y, Ji Y L, Xian B Z, Liu Y N (2022). Main controlling factors of physical properties of glutenite reservoirs of Es₄^s member in north zone of Dongying depression.J Jilin Univ (Earth Sci Ed), 52(4): 1091–1106

[6] David C, Menendez B, Zhu W, Wong T F (2001). Mechanical compaction, microstructures and permeability evolution in sandstones. Phys Chem Earth, Part A Solid Earth Geod, 26(1–2): 45–51

[7] Dietzel M (2000). Dissolution of silicates and the stability of polysilicic acid.Geochim Cosmochim Acta, 64(19): 3275–3281

[8] Duan W, Luo C F, Lou Z H, Liu J, Jin A, Zhu R (2017). Diagenetic differences caused by the charging of natural gases with various compositions - A case study on the lower Zhuhai Formation clastic reservoirs in the WC-A sag, the Pearl River Mouth Basin.Mar Pet Geol, 81: 149–168

[9] Ehrlich R, Crabtree S J, Horkowitz K O, Horkowitz J P (1991). Petrography and reservoir physics I: objective classification of reservoir porosity.AAPG Bull, 75(10): 1547–1562

[10] Eichhubl P, Davatzes N C, Becker S P (2009). Structural and diagenetic control of fluid migration and cementation along the Moab Fault, Utah.AAPG Bull, 93(5): 653–681

[11] Folk R L (19801980. Petrology of Sedimentary Rocks. Austin: Hemphill Publications

[12] Gale J F, Laubach S E, Marrett R A, Olson J E, Holder J, Reed R M (2004). Predicting and characterizing fractures in dolostone reservoirs: using the link between diagenesis and fracturing.Spec Publ Geol Soc Lond, 235(1): 177–192

[13] Gao H, Cao J, Wang C, He M, Dou L, Huang X, Li T (2019). Comprehensive characterization of pore and throat system for tight sandstone reservoirs and associated permeability determination method using SEM, rate-controlled mercury and high pressure mercury.J Petrol Sci Eng, 174: 514–524

[14] Hale S, Trindade Pedrosa E, Jacob A, Reinhardt M, Enzmann F, Kersten M, Butscher C, Blum P (2022). Upscaling calcite dissolution rates in a tight reservoir sandstone.Environ Earth Sci, 81(11): 303

[15] Harris N B (1989). Diagenetic quartzarenite and destruction of secondary porosity: an example from the Middle Jurassic Brent sandstone of northwest Europe.Geology, 17(4): 361–364

[16] He H Q, Zhi D M, Tang Y, Liu C W, Chen H, Guo X G, Wang Z S (2021). A great discovery of Well Kangtan 1 in Fukang Sag in the Junggar Basin and its significance.China Petrol Explor, 26(2): 1–11

[17] Higgs K E, Zwingmann H, Reyes A G, Funnell R H (2007). Diagenesis, porosity evolution, and petroleum emplacement in tight gas reservoirs, Taranaki Basin, New Zealand.J Sediment Res, 77(12): 1003–1025

[18] Hu X, Zou H L, Hu Z Z (2021). Reservoir characteristics and main controlling factors of glutenite reservoir in fan dalta glutenite: a case study of the Upper Urho Formation of Permian in the east slope of Dongdaohaizi Sag, Junggar Basin.J Northeast Petrol Univ, 45(6): 27–40

[19] Huang W H, Kiang W C (1972). Laboratory dissolution of plagioclase feldspars in water and organic acids at room temperature.American Mineralogist, 57(11−12): 1849–1859

[20] Laubach S E, Ward M E (2006). Diagenesis in porosity evolution of opening-mode fractures, Middle Triassic to Lower Jurassic la Boca Formation, NE Mexico.Tectonophysics, 419(1−4): 75–97

[21] Lavenu A P, Lamarche J, Salardon R, Gallois A, Marié L, Gauthier B D (2014). Relating background fractures to diagenesis and rock physical properties in a platform–slope transect. Example of the Maiella Mountain (central Italy).Mar Pet Geol, 51: 2–19

[22] Li S, Yao J, Mou W, Luo A, Wang Q, Deng X, Chu M, Li Y, Yan C (2018). The dissolution characteristics of the Chang 8 tight reservoir and its quantitative influence on porosity in the Jiyuan area, Ordos Basin, China.J Nat Gas Geosci, 3(2): 95–108

[23] Li Y P, Zou H, Li L, Fu J Y, Xia Y, Xie J Y (2022). Petroleum exploration ideas and discoveries in Upper Wuerhe Formation, Dongdaohaizi Sag, Junggar Basin.Xinjiang Petrol Geo, 43(2): 127–134

[24] Lin M R, Cao Y C, Xi K L, Wang J, Chen H, Wu J J (2018). Characteristics and controlling factors of Permian reservoirs in eastern slope of Fukang Sag.J Jilin Univ (Earth Sci Ed), 48(4): 991–1007

[25] Liu G F, Yin H, Lan Y F, Fei S, Yang D (2020). Experimental determination of dynamic pore-throat structure characteristics in a tight gas sandstone formation with consideration of effective stress.Mar Pet Geol, 113: 104170

[26] Milliken K L, Curtis M E (2016). Imaging pores in sedimentary rocks: foundation of porosity prediction.Mar Pet Geol, 73: 590–608

[27] Morad S (19981998. Carbonate Cementation in Sandstones: Distribution Patterns and Geochemical Evolution. Spec Publ Int Assoc Sediment, 1–26

[28] Nedkvitne T, Karlsen D A, Bjørlykke K, Larter S R (1993). Relationship between reservoir diagenetic evolution and petroleum emplacement in the Ula Field, North Sea.Mar Pet Geol, 10(3): 255–270

[29] Olson J E, Laubach S E, Lander R H (2007). Combining diagenesis and mechanics to quantify fracture aperture distributions and fracture pattern permeability.Spec Publ Geol Soc Lond, 270(1): 101–116

[30] Olson J E, Laubach S E, Lander R H (2009). Natural fracture characterization in tight gas sandstones: integrating mechanics and diagenesis.AAPG Bull, 93(11): 1535–1549

[31] Pittman E D, Larese R E (1991). Compaction of lithic sands: experimental results and applications1.AAPG Bull, 75: 1279–1299

[32] Qin Y, Yao S P, Xiao H, Cao J, Hu W, Sun L, Tao K, Liu X (2021). Pore structure and connectivity of tight sandstone reservoirs in petroleum basins: a review and application of new methodologies to the Late Triassic Ordos Basin, China.Mar Pet Geol, 129: 105084

[33] Qiu N S, Yang H B, Wang X L (2002). Tectono-thermal evolution in the Junggar Basin.Chin J Geo, 37(4): 423–429

[34] Sadegh J, Hamid Y, Shahram M (2008). Fluid evolution during burial diagenesis and subsequent orogenetic uplift: the La Vid Group (Cantabrian Zone, Northern Spain).J Sediment Res, 78(3−4): 282–300

[35] Salem A M, Morad S, Mato L F, Al-Aasm I S (2000). Diagenesis and reservoir-quality evolution of fluvial sandstones during progressive burial and uplift: evidence from the Upper Jurassic Boipeba Member, Recôncavo Basin, Northeastern Brazil.AAPG Bull, 84(7): 1015–1040

[36] Schimmel M T W, Hangx S J T, Spiers C J (2021). Impact of chemical environment on compaction behaviour of quartz sands during stress-cycling.Rock Mech Rock Eng, 54(3): 981–1003

[37] Schmidt V, McDonald D A, Platt R L (1977). Pore geometry and reservoir aspects of secondary porosity in sandstones.Bull Can Pet Geol, 25(2): 271–290

[38] Shanmugam G (1985). Significance of secondary porosity in interpreting sandstone composition.AAPG Bull, 69(3): 378–384

[39] Tang Z H, Longstaffe J F, Parnell J (1997). Diagenesis and reservoir potential of Permian-Triassic fluvial/lacustrine sandstones in the Southern Junggar Basin, northwestern China.AAPG Bull, 81(11): 1843–1865

[40] Wang Y Z, Cao Y C, Xi K L, Song G Q, Liu H M (2013). A recovery method for porosity evolution of clastic reservoirs with geological time: a case study from the upper submember of Es4 in the Dongying depression, Jiyang Subbasin.Acta Petrol Sin, 24(6): 1101–1111

[41] Wang Y Z, Lin M R, Xi K L, Cao Y, Wang J, Yuan G, Kashif M, Song M (2018). Characteristics and origin of the major authigenic minerals and their impacts on reservoir quality in the Permian Wutonggou Formation of Fukang Sag, Junggar Basin, western China.Mar Pet Geol, 97: 241–259

[42] Wong T F, Baud P (1999). Mechanical compaction of porous sandstone.Oil Gas Sci Technol, 54(6): 715–727

[43] Wong T F, David C, Menendez B (2004). Mechanical compaction.Intern Geophys, 89: 55–114

[44] Wu K Y, Zha M, Hong M (2004). Structural models of unconformity and recurrent diagenesis of semi-weathering rock in Junggar basin.Geotectonica et Metallogenia, 27(3): 270–276

[45] Xi K L, Cao Y C, Jahren J, Zhu R, Bjørlykke K, Haile B G, Zheng L, Hellevang H (2015b). Diagenesis and reservoir quality of the lower Cretaceous Quantou Formation tight sandstones in the southern Songliao Basin, China.Sediment Geol, 330(C): 90–107

[46] Xi K L, Cao Y C, Jahren J, Zhu R, Bjørlykke K, Zhang X, Cai L, Hellevang H (2015a). Quartz cement and its origin in tight sandstone reservoirs of the Cretaceous Quantou formation in the southern Songliao basin, China.Mar Pet Geol, 66: 748–763

[47] Yan J P, Fan J, Wang M, Li Z, Hu Q, Chao J (2018). Rock fabricand pore structure of the Shahejie sandy conglomerates from the Dongying depression in the Bohai Bay Basin, east China.Mar Pet Geol, 97: 624–638

[48] Yuan G, Cao Y, Schulz H M, Hao F, Gluyas J, Liu K, Yang T, Wang Y, Xi K, Li F (2019). A review of feldspar alteration and its geological significance in sedimentary basins: from shallow aquifers to deep hydrocarbon reservoirs.Earth Sci Rev, 191: 114–140

[49] Zhang J Y, Liu G D, Torsaeter O, Tao S, Jiang M, Li G, Zhang S (2020). Pore-throat structure characteristics and its effect on flow behavior in Gaotaizi tight siltstone reservoir, northern Songliao Basin.Mar Pet Geol, 122: 104651

[50] Zhi D M, Song Y, He W J, Jia X Y, Zou Y, Huang L L (2019). Geological characteristics, resource potential and exploration direction of shale oil in Middle-Lower Permian, Junggar Basin.Xinjiang Petrol Geo, 40: 389–401

[51] Zhou Y, Ji Y, Zhang S, Wan L (2016). Controls on reservoir quality of Lower Cretaceous tight sandstones in the Laiyang Sag, Jiaolai Basin, eastern China: integrated sedimentologic, diagenetic and microfracturing data.Mar Pet Geol, 76: 26–50

[52] Zhu S F, Zhu X M, Wang X L, Liu Z Y (2012). Zeolite diagenesis and its control on petroleum reservoir quality of Permian in northwestern margin of Junggar Basin, China.Sci China Earth Sci, 55(3): 386–396

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