In-context interpretation: Avoiding pitfalls in misidentification of igneous bodies in seismic data

Infante-Paez, Lennon; Marfurt, Kurt J.

doi:10.1190/int-2018-0076.1

Cited by 18 publications

(5 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If these alternating layers of sediment and basalt are <100 m, individual reflectors will not be resolvable (Eide et al., 2018; Mark et al., 2018) and the reflector identified will be both basalt and sediments. Similarly, the combination of sharp velocity changes from alternating layers of basalt and sediment will contribute to imaging and identification difficulties (Infante‐Paez & Marfurt, 2018). We therefore speculate that the mapped basalt may be <100‐m thick when considering difficulties in confidently interpreting the top and base of the horizon in any available seismic data.…”

Section: Discussionmentioning

confidence: 99%

New Estimates on the Basalt Volume of the Tarim (Not So Large) Igneous Province, NW China

et al. 2021

View full text Add to dashboard Cite

The early Permian basalts of the Tarim Basin of NW China are geographically widespread, covering over 200,000 km2 and are in places up to 1‐km thick and hence frequently referred to represent a Large Igneous Province (LIP). Available volume estimates are based on average lava thickness multiplied by area, using these values results in volumes exceeding 100,000 km3, and is commonly cited as being evidence of LIP status. Using a database of 58 boreholes, field sections, and seismic data we calculate a range of basalt isopach maps, and use these to estimate new, more refined overall eruption volumes. These volumes are significantly smaller than previously reported estimates. We demonstrate that the thickness distribution of erupted basalts is nonuniform and strongly skewed, indicating that volume estimates using an arithmetically averaged thickness of input data will result in overestimation of total volumes. We find that even with the addition of an estimated nonerupted volume component, representing cumulates and intrusions, that the total volume of the Tarim volcanics is significantly below the minimum threshold of a LIP. Using a simple Monte Carlo model we demonstrate that even while accounting for uncertainty and error in the input data, the probability of the total volume exceeding 100,000 km3 is very low. The new volume estimates imply a revision of the climate and environmental impact of the Tarim volcanism. We therefore suggest that the term Tarim Igneous Province should be used instead of Tarim Large Igneous Province.

show abstract

Section: Discussionmentioning

confidence: 99%

New Estimates on the Basalt Volume of the Tarim (Not So Large) Igneous Province, NW China

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In Australia, igneous rocks have been reconsidered in prospects where they were previously ignored (Holford et al, 2017;Zahedi & MacDonald, 2018;Bischoff, 2019). In New Zealand, pores and fractures have been identified in studies of physical volcanology in cores (Kennedy et al, 2017), reanalysis of ancient magmatic systems with reflection seismic (Bishoff, 2019), application of neural networks in 3D seismic data (Kumar et al, 2019) and study of seismic expressions of igneous rocks (Infante-Paez & Marfurt, 2018).…”

Section: Current Global Contextmentioning

confidence: 99%

“…To better understand these rocks, it is necessary to characterize their seismofacies (Delpino & Bermúdez, 2009;Angkasa et al, 2017;Infante-Paez & Marfurt, 2018, Planke et al, 2018, identify the igneous zones in well logs (Planke et al, 1994;Penna et al, 2018;Oliveira et al, 2019;Fornero et al, 2019;Correia et al, 2019), its petrogenesis, and petrophysical properties (Greenfield et al, 2019;. According to Jiang et al (2010), the petrophysical variability of igneous rocks is a key point to define a good reservoir and it can be influenced by cooling fractures, presence of vesicles and breccias, alteration, and fractures after solidification (Sruoga & Rubinstein, 2007;Zou, 2017;Yao et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Volcanic reservoirs: historic and current context

et al. 2021

View full text Add to dashboard Cite

Within the oil and gas industry, igneous rocks are still seen as exploration and production challenges, due to their diverse petrogenesis and the wide range of values of some important petrophysical properties. This petrophysical variability depends on both primary and secondary processes. These facts made these rocks unattractive for decades. This condition is still observed in many fields around the world. This article has as main objective to make a historical review of studies developed globally with a focus on igneous rocks that act as a reservoir in petroleum systems. The review covered in this article was developed from a compilation of global data, thus allowing an overview of the countries that produce hydrocarbons in volcanic rocks, what types of rocks, geological age, and size of the reserve. Countries such as China and Indonesia stand out with higher daily production, exceeding orders of quantities of 108 cubic meters of gas and 104 tons of barrels of oil. In these countries, geological patterns are already being noticed in volcanic reservoirs, such as more recent geological ages and typical lithologies. Also, this work seeks to emphasize the importance of studying this type of reservoir, as its knowledge can lead to the solution of real problems within the world oil and gas industry.

show abstract

“…Smallwood and Maresh, 2002;Magee et al, 2016) and saucer geometries showing a flat inner sill that passes laterally into an inclined limb (cf. Polteau et al, 2008;Haug et al, 2018;Infante-Paez and Marfurt, 2018;Schmiedel et al, 2019). C: Intrusive steps, i.e.…”

Section: Observationsmentioning

confidence: 99%

“…Smallwood and Maresh, 2002;Magee et al, 2016), (3) saucer-shape geometries forming parts of these lobes (see B) (cf. Polteau et al, 2008;Haug et al, 2018;Infante-Paez and Marfurt, 2018;Schmiedel et al, 2019); (4) intrusive steps (cf. Hansen et al, 2004;Magee et al, 2016;McBride et al, 2018) and (5) elongated amplitude anomalies (cf.…”

Section: Observationsmentioning

confidence: 99%

3-D seismic images of an extensive igneous sill in the lower crust

Wrona¹,

Magee²,

Fossen³

et al. 2019

Preprint

View full text Add to dashboard Cite

When continents rift, magmatism can produce large volumes of melt that migrate upwards from deep below the Earth’s surface. To understand how magmatism impacts rifting, it is critical to understand how much melt is generated and how it transits the crust. Estimating melt volumes and pathways is difficult, however, particularly in the lower crust where the resolution of geophysical techniques is limited. New broadband seismic reflection data allow us to image the three-dimensional (3-D) geometry of magma crystallized in the lower crust (17.5-22 km depth) of the northern North Sea, in an area previously considered a magma-poor rift. The sub-horizontal igneous sill is ~97 km long (N-S), ~62 km wide (E-W), and 180±40 m thick. We estimate that 472±161 km3 of magma was emplaced within this intrusion, suggesting that the northern North Sea contains more igneous intrusions than previously thought. The significant areal extent of the intrusion (~2700 km2), as well as presence of intrusive steps, indicate sills can facilitate widespread lateral magma transport in the lower crust.

show abstract

In-context interpretation: Avoiding pitfalls in misidentification of igneous bodies in seismic data

Cited by 18 publications

References 36 publications

New Estimates on the Basalt Volume of the Tarim (Not So Large) Igneous Province, NW China

New Estimates on the Basalt Volume of the Tarim (Not So Large) Igneous Province, NW China

Volcanic reservoirs: historic and current context

3-D seismic images of an extensive igneous sill in the lower crust

Contact Info

Product

Resources

About