The Influence of Magmatic Intrusions on Diagenetic Processes and Stress Accumulation

Sydnes, Magnhild; Fjeldskaar, Willy; Grunnaleite, Ivar; Løtveit, Ingrid Fjeldskaar; Mjelde, Rolf

doi:10.3390/geosciences9110477

Cited by 8 publications

(4 citation statements)

References 116 publications

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“…The intrusion may also affect the migration pathway, providing a conduit along which generated hydrocarbons may move from source to reservoir rocks as well as provide capping and/or sealing structures suitable for the entrapment of hydrocarbons (White & McKenzie, 1989). In these respected, the intrusion at the depths of 1274 to 1384 m would serve as cap rock while that at the depths of 1838 to 1900 m would serve as seal rock to the possible source and reservoir rocks located by 1384 and 1838 m. Similarly, the possible reservoir rock between the depths of 1900 to 1964 m could be capped by the intrusion at the depth of 1838 to 1900 m and be sealed by the intrusion at the depth 1964 to 2060 m. Magmatic intrusions also alter the physical properties of capping and sealing rocks, increasing the accumulation of stress which leads to the opening of fractures and activation and reactivation of faults that may influence permeability (Sydnes, et al 2019).…”

Section: Results and Discussion 41mentioning

confidence: 99%

Assessment of the interval heat flow and thermal resistance at the Faltu-1 well, Borno basin, NE Nigeria

Ali¹,

Mosto-Onuoha²

2021

Glo Jnl Pure Appl Sci

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The heat flowing through horizons in the Faltu-1 well, Borno Basin, NE Nigeria was calculated from their thermal conductivities and geothermal gradients with the aim of determining whether or not it is uniform, and if not, the depths where it is diverted, and the possible heat diversion process. The interval heat flow was assessed to be non-uniform. While fluid convection is adjudged to be the major heat diversion mechanism within the Chad Formation with minor heat refraction, the reversed is adjudged to be the situation for the underlying Kerri Kerri Formaton within which increasing sand content with depth is also predicted, with the lower interval predicted to be the Gombe Formation. Patterns of disruptions to the vertical heat flow within the Fika Formation were inferred to suggest rhythmic bedding of shale and sand beds that could serve as both source and reservoir rocks. Magmatic intrusions that impacted the maturation of organic matter into oil and gas also provided necessary entrapment structures and possible migration pathways. The Gongila and Bima Formations each has single disruption of the heat flows that are attributed to refraction. In the case of the Gongila Formation, the disruption is between the early-deposited more sandy and laterdeposited more shaley lithologies in the marine transgression of the area, while in the case of the Bima, it is between the more shaley Upper and more sandy Middle Bima Formations. Analysis of the Bullard plots also revealed disruptions to the vertical heat flow that are attributed either to convecting fluids or to heat refraction and diffraction. Two such disrupting heat advections were identified within the Chad Formation with the first being attributed to convection, while the other is attributed to a combination of both. Two similar disruptions for the Kerri Kerri Formation were attributed largely to lithological variations with minor contributions from convection of fluids. While unable to discern the rhythmic bedding, the five disruptions of the Bullard plot for the Fika Formation and one each for the Gongila and Bima Formations were interpreted to indicate similar features inferred from interval heat flow plots. Keywords: Interval heat flow, heat convection, heat diffraction, thermal resistivity, shaliness

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Section: Results and Discussion 41mentioning

confidence: 99%

Assessment of the interval heat flow and thermal resistance at the Faltu-1 well, Borno basin, NE Nigeria

Ali¹,

Mosto-Onuoha²

2021

Glo Jnl Pure Appl Sci

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Section: Implications For Reservoir Qualitymentioning

confidence: 99%

“…The injection of magmatic fluids into cooler sandstone reservoirs can have significant impacts on porosity (Einsele et al, 1980;Senger et al, 2014;Sydnes et al, 2019b;Haile et al, 2019). The extent of magmatic sill-induced diagenetic alterations in sandstones largely depends on their proximity to the sill, the thickness of the sill, the depth at which the sill intrusions occur, and the clusters of the sill (Aarnes et al, 2011;Sydnes et al, 2019b;2019a;Chen et al, 2021). Previous studies on the role of magmatic intrusions on sandstones porosity evolution and diagenesis have come to contrasting conclusions of both positive and negative impacts on porosity (Feng and Tang, 1997;Mckinley et al, 2001;Grove et al, 2017;Chen et al, 2021).…”

Section: Implications For Reservoir Qualitymentioning

confidence: 99%

Impact of magmatic intrusion on diagenesis of shallow marine sandstones: An example from Qasim Formation, Northwest Saudi Arabia

et al. 2023

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Igneous intrusions are common in sedimentary basins, and their occurrence can significantly affect the diagenesis and reservoir quality evolution of sandstones, thereby strongly impacting their hydrocarbons-, geothermal-, and CO2-storage potentials. The Qasim sandstones in the Tabuk region (NW Saudi Arabia) experienced shallow burial diagenesis (<2 km) when the Tertiary magma intruded to form basaltic sills (0.4–4 m thick). The sedimentology, tectono-stratigraphic framework, provenance, and chemostratigraphy of the Qasim Formation have been extensively covered in the literature. However, the impact of the magmatic intrusion on diagenesis and reservoir quality evolution of the sandstones remains enigmatic. This study employed thin-section petrography, QEMSCAN, XRD, SEM, and energy-dispersive spectrometer analyses to investigate the role of magmatic intrusion on diagenesis and reservoir quality of the Qasim sandstones. The results of the study indicate that reservoir porosity is principally influenced by primary depositional characteristics (grain size and sorting), diagenetic alterations, and magmatic intrusions. Sandstones with coarser grain size and better sorting have the best intergranular porosity and vice versa. The “normal” diagenetic processes that have significantly affected the reservoir porosity of the sandstones occurred during both shallow burial (eodiagenesis) and uplift (telodiagenesis). The eogenetic alterations include mechanical compaction, early diagenetic cementation by calcite, pyrite, and kaolinite, whereas the telogenetic alterations include the formation of kaolinite, goethite, hematite. Overall, mechanical compaction is the main driver for porosity loss in the sandstones. The intrusion-related diagenetic processes include the dissolution of quartz grains, rounded quartz overgrowths, and calcite cement, and the transformation of kaolinite into dickite and chlorite. Detrital quartz and rounded quartz overgrowths have undergone dissolution due to acidic pore fluids from magma and high temperature. The transformation of kaolinite into dickite occurred in a dissolution-recrystallization fashion, and the amounts of kaolinite and dickite increase in fine-grained sediments away from sill contact due to hydrodynamic processes that deposited muscovite (which form kaolinite) in low energy environments. The chloritization of kaolinite was localized, and the magma-induced dissolution of goethite likely supplied the requisite high Fe content. Additionally, the intrusion has resulted in the dissolution of the early calcite and increase in porosity towards the sill contact. However, values for compactional porosity loss have relatively remained similar both at and away from the sill contact, as the sill is too thin to exert significant vertical loading. This study has relevance to understanding hydrocarbon exploration and exploitation in sediment-lava sequences, and to understanding the development of sediment-lava systems.

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“…Sydnes et al [10] evaluate the impact of sill emplacement on diagenetic processes and stress accumulations. Based on data from the Vøring Basin (Norwegian Sea), the modeling shows that basins with magmatic intrusions have thermal histories that enhance diagenetic processes during and after sill emplacement.…”

Section: Magmatic Sillsmentioning

confidence: 99%

A Summary of “Future Advances in Basin Modeling: Suggestions from Current Observations, Analyses and Simulations”

Cathles

Fjeldskaar

2020

Geosciences

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The Influence of Magmatic Intrusions on Diagenetic Processes and Stress Accumulation

Cited by 8 publications

References 116 publications

Assessment of the interval heat flow and thermal resistance at the Faltu-1 well, Borno basin, NE Nigeria

Assessment of the interval heat flow and thermal resistance at the Faltu-1 well, Borno basin, NE Nigeria

Impact of magmatic intrusion on diagenesis of shallow marine sandstones: An example from Qasim Formation, Northwest Saudi Arabia

A Summary of “Future Advances in Basin Modeling: Suggestions from Current Observations, Analyses and Simulations”

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