Paleoenvironment evolution and organic matter enrichment mechanisms in the first member of the Qingshankou Formation, Songliao Basin, China

Abstract

Organic matter is the basis for oil and gas generation, and the depositional environment controls its enrichment. The first member of the Qingshankou Formation (K₂qn¹) in Songliao Basin has a thick organic-rich shale and so is an important target section for shale oil exploration and development. In the Gulong Sag, shale samples from this unit were collected over the full length of the section. The characterization of the environments of deposition (EOD) of K₂qn¹ was improved by utilizing lithological characteristics, thin section observations, elemental compositions, and organic carbon concentrations. Combined with the normalization coefficients proposed in this paper, an organic matter correlation model was established to elucidate the factors that influence organic matter enrichment. From the bottom to the top of K₂qn¹, the lake depth gradually becomes shallower, the primary productivity first decreases and then increases, the reducing conditions become stronger and then weaker, the water salinity gradually decreases, the climate first becomes semi-humid and then warm and humid, and the input of terrigenous debris first decreases and then increases. A major marine transgression at the base of the K₂qn¹᾽s brought in nutrients to increase primary productivity, and the density-stratified reducing environment preserved and enriched organic matter. High primary productivity occurred during the middle of the deposition of the K₂qn¹, while terrigenous input is low. Organic matter is preserved in reduced deep lake environments, resulting in organic matter-rich black shale. The lake became shallower, and the salinity decreased in the upper part of K₂qn¹. Benthic organisms rapidly multiplied, consuming large amounts of oxygen and destroying the previously depositional environment, resulting in a reducing environment disturbed by benthic organisms with poor preservation conditions and the lowest organic matter content.

Graphical abstract

Keywords

major and trace elements / paleoenvironment evolution / OM enrichment mechanism / lacustrine shale / Songliao Basin / Qingshankou Formation

References

[1] Bohacs K M (1990). Sequence stratigraphy of the Monterey Formation, Santa Barbara County: integration of physical, chemical, and biofacies data from outcrop and subsurface.AAPG Bull, 75: 139–143

[2] Bohacs K M, Carroll A R, Neal J E, Mankiewicz P J, Gierlowski-Kordesch E, Kelts K (2000). Lake-basin type, source potential, and hydrocarbon character: an integrated sequence-stratigraphic-geochemical framework. In: Gierlowski-Kordesch, Kelts K R, eds. Lake Basins Through Space and Time.AAPG Studies in Geology, 46: 3–34

[3] Bohacs K M, Grabowski G J, Carroll A R, Mankiewicz P J, Miskell-Gerhardt K J, Schwalbach J R, Wegner M B, Simo J T (2005). Production, destruction, and dilution—the many paths to source-rock development.SEPM Special Publications, 82: 61–101

[4] Brumsack H J (2006). The trace metal content of recent organic carbon-rich sediments: implications for Cretaceous black shale formation.Palaeogeogr Palaeoclimatol Palaeoecol, 232(2–4): 344–361

[5] Cao J, Wu M, Chen Y, Hu K, Bian L, Wang L, Zhang Y (2012). Trace and rare earth element geochemistry of Jurassic mudstones in the northern Qaidam Basin, northwest China.Geochem, 72(3): 245–252

[6] Carbonel P, Colin J, Danielopol D, Löffler H, Neustrueva I (1988). Paleoecology of limnic ostracodes: a review of some major topics.Palaeogeogr Palaeoclimatol Palaeoecol, 62: 413–461

[7] Cecil C B (1990). Paleoclimate controls on stratigraphic repetition of chemical and siliciclastic rocks.Geology, 18: 533–536

[8] Chase Z, Anderson R F, Fleisher M Q (2001). Evidence from authigenic uranium for increased productivity of the glacial Subantarctic Ocean.Paleoceanography, 16(5): 468–478

[9] Chen Z, Chen Z, Zhang W (1997). Quaternary stratigraphy and trace-element indices of the Yangtze Delta, Eastern China, with special reference to marine transgressions.Quat Res, 47(2): 181–191

[10] Chen Z, Cui J, Ren Z, Jiang S, Liang X, Wang G, Zou C (2019). Geochemistry, paleoenvironment and mechanism of organic‐matter enrichment in the Lower Silurian Longmaxi Formation shale in the Sichuan Basin, China.Acta Geol Sin, 93(3): 505–519

[11] Dill H (1986). Metallogenesis of early Paleozoic graptolite shales from the Graefenthal Horst (northern Bavaria-Federal Republic of Germany).Econ Geol, 81(4): 889–903

[12] Ding J, Zhang J, Shi G, Shen B, Tang X, Yang Z, Li X, Li C (2021). Sedimentary environment and organic matter accumulation for the Longtan Formation shale in Xuancheng area.Acta Sediment Sin, 39: 324–340

[13] Feng Y, Yang Z, Zhu J, Zhang S, Fu X (2021). Sequence stratigraphy in post‐rift river‐dominated lacustrine delta deposits: a case study from the Upper Cretaceous Qingshankou Formation, northern Songliao Basin, northeastern China.Geol J, 56(1): 316–336

[14] Feng Z, Fang W, Li Z, Wang X, Huo Q, Huang C, Zhang J, Zeng H (2011). Depositional environment of terrestrial petroleum source rocks and geochemical indicators in the Songliao Basin.Sci China Earth Sci, 54(9): 1304–1317

[15] Feng Z, Fang W, Wang X, Huang C, Huo Q, Zhang J, Huang Q, Zhang L (2009). Microfossils and molecular records in oil shales of the Songliao Basin and implications for paleo-depositional environment.Sci China Ser D Earth Sci, 52(10): 1559–1571

[16] Feng Z, Jia C, Xie X, Shun Z, Feng Z, Cross T A (2010). Tectonostratigraphic units and stratigraphic sequences of the nonmarine Songliao Basin, northeast China.Basin Res, 22(1): 79–95

[17] Fu X, Meng Q, Bai Y, Su Y, Jin M, Huo Z, Li H, Cui K, Xu Q, Zhu Z, Cao W, Jia Q (2022). Quantitative analysis of paleoenvironment of Qingshankou Formation in northern Songliao Basin, northeastern China.Interpretation (Tulsa), 10(3): SD75–87

[18] Gao R Q, He C Q, Qi X Y (1992). A new genus and species of Cretaceous dinoflagellates from two transgressive beds in Songliao Basin, NE China.Acta Palaeontologica Sinica, 31: 17–29

[19] GaoR, CaiX (1997). Hydrocarbon Formation Conditions and Distribution Rules in the Songliao Basin. Beijing: Petroleum Industry Press, 1–103

[20] Getaneh W (2002). Geochemistry provenance and depositional tectonic setting of the Adigrat Sandstone northern Ethiopia.J Afr Earth Sci, 35(2): 185–198

[21] Guan M, Wu S, Hou L, Jiang X, Ba D, Hua G (2021). Paleoenvironment and chemostratigraphy heterogeneity of the Cretaceous organic-rich shales.Adv Geo-Energy Res, 5(4): 444–455

[22] Haddad R I, Martens C S (1987). Biogeochemical cycling in an organic-rich coastal marine basin: 9. Sources and accumulation rates of vascular plant-derived organic material.Geochim Cosmochim Acta, 51(11): 2991–3001

[23] Hakimi M H, Abdullah W H, Shalaby M R, Alramisy G A (2014). Geochemistry and organic petrology study of Kimmeridgian organic-rich shales in the Marib-Shabowah Basin, Yemen: origin and implication for depositional environments and oil-generation potential.Mar Pet Geol, 50: 185–201

[24] Hetzel A, März C, Vogt C, Brumsack H J (2011). Geochemical environment of Cenomanian-Turonian black shale deposition at Wunstorf (northern Germany).Cretac Res, 32(4): 480–494

[25] Hou D (1999). The characteristics of molecular geochemistry of marine transgression strata in Songliao Basin.Acta Petrol Sin, 20: 30–34

[26] Hou D, Feng Z, Huang Q (2003). Geological and geochemical evidences of anoxic event in the Songliao Basin.Geoscience, 17: 311–317

[27] Hu T, Pang X, Jiang F, Wang Q, Xu T, Wu G, Cai Z, Yu J (2021). Factors controlling differential enrichment of organic matter in Saline Lacustrine Rift Basin: a case study of third member Shahejie Fm in Dongpu Depression.Acta Sedimento Sin, 39: 140–152

[28] Huang Q, Zheng Y, Yang M, Li X, Han M, Chen C (1999). On Cretaceous paleoclimate in the Songliao Basin.Acta Micropalaeontologica Sin, 16: 95–103

[29] Jarvie D M (2012). Shale resource systems for oil and gas: part 2—Shale-oil resource systems. In: Breyer J A, ed. Shale Reservoirs—Giant Resources for the 21st Century.AAPG Memoir, 97: 89–119

[30] Jenkyns H C (1980). Cretaceous anoxic events: from continents to oceans.J Geol Soc London, 137(2): 171–188

[31] Jia J, Liu Z, Bechtel A, Strobl S A, Sun P (2013). Tectonic and climate control of oil shale deposition in the Upper Cretaceous Qingshankou Formation (Songliao Basin, NE China).Int J Earth Sci, 102(6): 1717–1734

[32] Jones B, Manning D A (1994). Comparison of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones.Chem Geol, 111(1–4): 111–129

[33] Li C, Yan W, Wu H, Tian H, Zheng J, Yu J, Feng Z, Xu H (2022). Calculation method of oil saturation in clay-rich shale reservoirs and its application: a case study of Qing 1 Member of Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, NE China.Pet Explor Dev, 49: 1–11

[34] Li D (1996). Basic characteristics of oil and gas basins in China.J Southeast Asian Earth Sci, 13(3–5): 299–304

[35] Liu B, Shi J, Fu X, Lyu Y, Sun X, Gong L, Bai Y (2018). Petrological characteristics and shale oil enrichment of lacustrine fine-grained sedimentary system: a case study of organic-rich shale in first member of Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, NE China.Pet Explor Dev, 45(5): 884–894

[36] Liu B, Song Y, Zhu K, Su P, Ye X, Zhao W (2020). Mineralogy and element geochemistry of salinized lacustrine organic-rich shale in the Middle Permian Santanghu Basin: implications for paleoenvironment, provenance, tectonic setting and shale oil potential.Mar Pet Geol, 120: 104569

[37] Liu B, Wang H, Fu X, Bai Y, Bai L, Jia M, He B (2019). Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China.AAPG Bull, 103(2): 405–432

[38] Liu B, Wang Y, Tian S, Guo Y, Wang L, Yasin Q, Yang J (2022). Impact of thermal maturity on the diagenesis and porosity of lacustrine oil-prone shales: insights from natural shale samples with thermal maturation in the oil generation window.Int J Coal Geol, 261: 104079

[39] Meng X, Li C, Gui R (2014). Ancient sedimentary environment significance revealed by the trace elements of Shan 2 to He 8 member of Upper Paleozoic in Yanan.Unconventional Oil & Gas, 1: 26–30

[40] Murphy A E, Sageman B B, Hollander D J, Lyons T W, Brett C E (2000). Black shale deposition and faunal overturn in the Devonian Appalachian Basin: clastic starvation, seasonal water‐column mixing, and efficient biolimiting nutrient recycling.Paleoceanography, 15(3): 280–291

[41] Peters K, Moldowan J, Schoell M, Hempkins W (1986). Petroleum isotopic and biomarker composition related to source rock organic matter and depositional environment.Org Geochem, 10(1–3): 17–27

[42] Rimmer S M (2004). Geochemical paleoredox indicators in Devonian–Mississippian black shales, central Appalachian Basin (USA).Chem Geol, 206(3–4): 373–391

[43] Rimmer S M, Thompson J A, Goodnight S A, Robl T L (2004). Multiple controls on the preservation of organic matter in Devonian–Mississippian marine black shales: geochemical and petrographic evidence.Palaeogeogr Palaeoclimatol Palaeoecol, 215(1–2): 125–154

[44] Song Y, Liu Z, Meng Q, Xu J, Sun P, Cheng L, Zheng G (2016). Multiple controlling factors of the enrichment of organic matter in the upper cretaceous oil shale sequences of the Songliao Basin, NE China: implications from geochemical analyses.Oil Shale, 33(2): 142–166

[45] Sun L, Liu H, He W, Li G, Zhang S, Zhu R, Jin X, Meng S, Jiang H (2021). An analysis of major scientific problems and research paths of Gulong shale oil in Daqing Oilfield, NE China.Pet Explor Dev, 48(3): 527–540

[46] Sun Z, Wang F, Hou Y, Luo J, Zheng Y, Wu S, Zhu G (2020). Main controlling factors and modes of organic matter enrichment in salt lake shale.Earth Sci (Paris), 45: 1375–1387

[47] Talbot M (1988). The origins of lacustrine oil source rocks: evidence from the lakes of tropical Africa.Spec Publ Geol Soc Lond, 40(1): 29–43

[48] TaylorS R, McLennan S M (1985). The Continental Crust: Its Composition and Evolution: An Examination of the Geochemical Record Preserved in Sedimentary Rocks. Oxford: Blackwell Scientific

[49] Tribovillard N, Algeo T J, Lyons T, Riboulleau A (2006). Trace metals as paleoredox and paleoproductivity proxies: an update.Chem Geol, 232(1–2): 12–32

[50] Vincent B, Rambeau C, Emmanuel L, Loreau J P (2006). Sedimentology and trace element geochemistry of shallow-marine carbonates: an approach to paleoenvironmental analysis along the Pagny-sur-Meuse Section (Upper Jurassic, France).Facies, 52(1): 69–84

[51] WangD, LiuZ, LiuL (1994). Evolution and Sea Level Elevation of Songliao Basin. Beijing: Geological Publishing House, 91–128 (in Chinese)

[52] Wang F, Liu X, Deng X, Li Y, Tian J, Li S, You J (2017). Geochemical characteristics and environmental implications of trace elements of Zhifang Formation in Ordos Basin.Acta Sedimentologica Sinica, 35: 1265–1273

[53] Wang L, Zeng W, Xia X, Zhou H, Bi H, Shang F, Zhou X (2019). Study on lithofacies types and sedimentary environment of black shale of Qingshankou Formation in Qijia-Gulong Depression, Songliao Basin.Nat Gas Geosci, 30: 1125–1133

[54] Wang L, Zhou H, Shang F, Zhou X (2022). Element geochemical characteristics of black shale and paleo-sedimentary environmental restoration of Qingshankou Formation of the Cretaceous in the northern Songliao Basin.Chinese J Geo, 57: 156–171

[55] Wang P, Wang D, Du X (1996). The origin of the black shales and the bottom current model for seawater encroachment in the Cretaceous Qingshankou Formation, Songliao Basin, northeast China.Sediment Facies Palaeogeogr, 16: 34–43

[56] WangY, LiuZ, SunP (2015). Organic matter evolution in the first member of Qingshankou Formation in Well NGN1, Upper Cretaceous, Songliao Basin. Global Geo 34: 735–742 (in Chinese)

[57] WignallP B (1994). Black Shales. Oxford Monographs on Geology and Geophysics 30. New York: Oxford University Press

[58] Wu H, Zhang S, Huang Q (2008). Establishment of floating astronomical time scale for the terrestrial Late Cretaceous Qingshankou Formation in the Songliao Basin of northeast China.Earth Sci Front, 15(4): 159–169

[59] Wu H, Zhang S, Jiang G, Huang Q (2009). The floating astronomical time scale for the terrestrial Late Cretaceous Qingshankou Formation from the Songliao Basin of northeast China and its stratigraphic and paleoclimate implications.Earth Planet Sci Lett, 278(3–4): 308–323

[60] Xu C, Shan X, He W, Zhang K, Rexiti Y, Su S, Liang C, Zou X (2021). The influence of paleoclimate and a marine transgression event on organic matter accumulation in lacustrine black shales from the Late Cretaceous, southern Songliao Basin, northeast China.Int J Coal Geol, 246: 103842

[61] Xu J, Liu Z, Bechtel A, Meng Q, Sun P, Jia J, Cheng L, Song Y (2015). Basin evolution and oil shale deposition during Upper Cretaceous in the Songliao Basin (NE China): implications from sequence stratigraphy and geochemistry.Int J Coal Geol, 149: 9–23

[62] Yang D, Yu M (2002). The Uranium-organic geochemistry development.Global Geo, 21: 18–23

[63] Zhang C, Zhang W, Guo Y (2012). Sedimentary environment and its effect on hydrocarbon source rocks of Longmaxi Formation in Southeast Sichuan and Northern Guizhou.Earth Sci Front, 19: 136–145

[64] ZhangS (1988). Research and application of Magnesium-Aluminum content ratio in sedimentary rock. Bulletin of Mineralogy, Petrology Geochem, 7: 112–113 (in Chinese)

[65] Zhao Z, Littke R, Zieger L, Hou D, Froidl F (2020). Depositional environment, thermal maturity and shale oil potential of the Cretaceous Qingshankou Formation in the eastern Changling Sag, Songliao Basin, China: an integrated organic and inorganic geochemistry approach.Int J Coal Geol, 232: 103621

[66] Zheng G, Meng Q, Liu Z (2020). Geochemical characteristics and paleolimnological information of oil shale in 1st member of Qingshankou Formation in Northern Songliao Basin.J Jilin U Earth Sci Ed, 50: 392–404

[67] Zou C, Zhu R, Chen Z, Ogg J G, Wu S, Dong D, Qiu Z, Wang Y, Wang L, Lin S, Cui J, Su L, Yang Z (2019). Organic-matter-rich shales of China.Earth Sci Rev, 189: 51–78

Acknowledgments

This study was funded by the National Natural Science Foundation of China (Grant Nos. 42072147 and 41922015), and the Fundamental Research Funds for the Central Universities (No. 22CX07001A).

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