The influence of multiple-stage oil emplacement on deeply buried marine sandstone diagenesis: A case study on the Devonian Donghe sandstones, Tabei Uplift, Tarim Basin, NW China

Lei, Zhicheng; Xu, Huaimin; Liu, Qiang; Li, Weilu; Yan, Dezhi; Li, Songze; Lei, Ping; Yan, Mengying; Li, Jingwen

doi:10.1016/j.marpetgeo.2019.07.030

Cited by 16 publications

(6 citation statements)

References 58 publications

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“…Midtbø et al, 2000;Worden and Barclay, 2003) or carbonate cementation (e.g. Lei et al, 2019). Particularly, the relationship between petroleum emplacement and various diagenetic reactions in sandstones needs to be further considered and explored in future studies.…”

Section: Implication For Petroleum Reservoir Quality Predictionmentioning

confidence: 99%

“…Some studies have recorded higher porosity and less quartz cement in the reservoirs where pore waters have been replaced by petroleum, thereby invoking petroleum emplacement as a mechanism of porosity preservation (e.g. Gluyas et al, 1993;Marchand et al, 2001;Worden et al, 2018;Lei et al, 2019). Nevertheless, at least an equal number of studies have reached the opposite conclusion; these studies observed on-going quartz cementation in oil-filled reservoirs and that the porosity of these reservoirs does not appear to be higher than the water-filled counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Petroleum emplacement inhibits quartz cementation and feldspar dissolution in a deeply buried sandstone

Xia

Wilkinson

Haszeldine

2020

Marine and Petroleum Geology

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Whether the emplacement of petroleum in sandstone reservoirs can preserve porosity during burial remains controversial. In the Kessog Field, UK Central North Sea, average porosities of the crestal sections of the fluvial-deltaic Pentland Formation reservoir can exceed 25 % despite burial to 4 km or more. The predicted porosity for the reservoir at this depth is only around 14 % based on regional data. Oil saturation data, thin-section point counts, grain-size and sorting measurements, reservoir pressure, and SEM images were combined to analyze the cause of the high reservoir porosity. Petroleum emplacement preventing cementation is the most likely mechanism for porosity preservation. Facies variation is not responsible, as the high-porosity sandstones from the crestal well are, in terms of average grain-size (fine-grained) and sorting coefficient (moderately well-sorted), nearly the same as the lower porosity sandstones from the flanks of the field (average porosity 13 -15%). Other potential porosity-preservation mechanisms, such as overpressure, grain-coats and feldspar dissolution can be discounted. The sandstones with high oil saturations are characterized by: 1) most porosity being primary as opposed to secondary; 2) there being 2 -5 % less quartz cement than in the water-saturated sandstones; 3) there being 2 -3 % more Kfeldspar and 2 -6 % less kaolin than the water-saturated counterparts. This study demonstrates that petroleum emplacement can effectively inhibit quartz cementation and K-feldspar transformation to kaolin in sandstone reservoirs.

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Section: Implication For Petroleum Reservoir Quality Predictionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Petroleum emplacement inhibits quartz cementation and feldspar dissolution in a deeply buried sandstone

Xia

Wilkinson

Haszeldine

2020

Marine and Petroleum Geology

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“…However, there is no significant difference in the proportion of this secondary porosity between the reservoir oil and water leg, indicating that hydrocarbon emplacement did not play a role in the diagenetic dissolution of these sandstones. This interpretation is plausible considering that the diagenetic dissolution of unstable detrital grains like feldspar may be caused by acidic fluids related to meteoric water incursion during shallow burial or organic acids from thermal evolution source rocks or petroleum biodegradation during deep burial diagenesis (Lei et al, 2019). In this study, paragenetic sequence analysis clearly shows that they occurred at shallow diagenetic burial depths influenced by meteoric water incursion long before hydrocarbon incursion into these sandstones.…”

Section: Discussionmentioning

confidence: 99%

Influence of reservoir oil charging on diagenesis and reservoir quality: An example from Dunlin Reservoir Sandstones, East Shetland Basin, North Sea, UK

Okunuwadje,

Ogbe,

Odokuma‐Alonge

2023

Geological Journal

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The sandstone facies from two reservoir blocks (extensional fault walls) of the Dunlin Field have been studied to evaluate the impact of the reservoir charge history on the diagenesis and reservoir quality of these sandstones. The study has identified seven main reservoir sandstone facies (D1–D7) from the reservoir crestal block (oil leg) to the flank block (water leg). These sandstone facies exhibited similar diagenetic patterns, controlled by their depositional parameters, hence having the same porosity and permeability values in both reservoir blocks (legs) until hydrocarbon charging in the Late Cretaceous‐Pliocene. The burial and thermal model indicates that these reservoirs were charged at a temperature of 60–75°C during the 80–50 Ma and 95–100°C during the 10 Ma to Present, and significantly controlled the mesodiagenetic output, notably illite, and quartz authigenesis. The reservoir oil leg recorded a higher amount of recovered bitumen (ca. 95%) than the water leg (ca. 5%), indicating that hydrocarbon charging of the sandstone reservoir was progressive rather than instantaneous, first filling the water leg (palaeo‐oil leg). Subsequent leak‐off depleted this reservoir block and remigrated to fill the reservoir leg (palaeo‐water). The fluctuating oil charging and leakage between these two reservoir fault blocks modulated diagenetic alteration of these reservoir sandstones; hence is the cause of the minor disparity in porosity values between these reservoir legs contrary to the wide variation between conventional reservoir oil‐ and water‐legs distinguished by hydrocarbon emplacement with no such complex history. This study, therefore, demonstrates the importance of evaluating the depositional and diagenetic controls on reservoir quality and charging of hydrocarbon‐bearing sandstones for optimum oil production and recovery in clastic depositional settings.

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“…The first is the lithology configuration relationship of the fault zone in the Lishui West Sag, that is, the lithology juxtapositional sealing. The second is the influence of the sealing layer on the shale smearing mode in the Lishui West Sag; the third is the pressure-bearing mode of fault rock, that is, the pressure effect of the hydrocarbon-bearing system (Lei et al, 2019).…”

Section: Shale Smear Sealingmentioning

confidence: 99%

Study on fault sealing of the Lishui West Sag in the East China Sea Basin

Yang

Fu²,

Liu³

et al. 2023

Front. Earth Sci.

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The property of fault sealing is a critical controlling factor for hydrocarbon transportation. To date, the sealing property of the complex fault system in the Lishui West Sag is still not clear, meaning it is essential to study regional hydrocarbon transportation and reservoir formation. In this study, we use an integrated method to quantitatively analyze and characterize several important index parameters that affect the sealing property of the faults in the Lishui West Sag based on regional logs and seismic data. We calculated the shale smear factor (SSF), shale gouge ratio (SGR), and clay smear potential (CSP) to characterize the lateral sealing property of the main faults covered with the giant thick shale cap in the Lishui West Sag. We used the vertical shale smear factor Q to clarify the vertical sealing property of these faults quantitatively as a comparison. The results show that the shale cap has a strong smear ability in the Lishui West Sag, while the active fault could moderate the smear. A high fault activity in this area benefits hydrocarbon transportation at the same time. The lateral sealing property and the vertical sealing property of the main faults in the Lishui West Sag have negative correlations.

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The influence of multiple-stage oil emplacement on deeply buried marine sandstone diagenesis: A case study on the Devonian Donghe sandstones, Tabei Uplift, Tarim Basin, NW China

Cited by 16 publications

References 58 publications

Petroleum emplacement inhibits quartz cementation and feldspar dissolution in a deeply buried sandstone

Petroleum emplacement inhibits quartz cementation and feldspar dissolution in a deeply buried sandstone

Influence of reservoir oil charging on diagenesis and reservoir quality: An example from Dunlin Reservoir Sandstones, East Shetland Basin, North Sea, UK

Study on fault sealing of the Lishui West Sag in the East China Sea Basin

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