The impacts of CO2 on sandstone reservoirs in different fluid environments: insights from mantle-derived CO2 gas reservoirs in Dongying Sag, Bohai Bay Basin, China DOI Creative Commons
Maoyun Wang, Zeng Jian, Chuanming Li

et al.

Frontiers in Earth Science, Journal Year: 2024, Volume and Issue: 12

Published: Nov. 7, 2024

Introduction Mantle-derived CO 2 , as an important component of hydrothermal fluids, is widely distributed in petroliferous basins. While previous experimental studies have suggested that can improve sandstone reservoir quality through mineral dissolution open fluid setting, they overlooked its nagetive effects to by carbonate cementation. Additionally, the roles various environments -reservoir interactions not been studied detail. Methods To systematically investigate influences on reservoirs, we examine a typical mantle-derived gas reservoir, Bohai Bay Basin, China. This study employs integrated methods, including electron microscopy, scanning X-ray diffraction, stable C- and O-isotope analysis, physical property data. The aim evidence mechanisms which impacts particularly focusing closed environments. Results Discussion Our findings reveal dawsonite ankerite are prevalent within while isotopic analysis cements indicates values (δ 13 C: −9.0‰ −1.6‰; δ 18 O: −21.7‰ −12.7‰) consistent with fluids. These pieces indicate -rich fluids participate water-rock interactions, thereby significantly influencing diagenesis reservoirs. Further, notice reservoirs adjacent faults exhibit environment, characterized superior porosity permeability, more quartz, but fewer feldspar, carbonate, clay minerals compared those Notably, kaolinite predominates environments, illite/smectite (I/S) common settings. dual highlighted our analysis: it enhances storage permeability dissolution, cement generated -water-rock interaction also adversely affect quality. In facilitates feldspar minerals, promoting timely removal by-products (clay mineral) inhibiting cementation, improving properties. Conversely, decreasing concentrations depth leads diminishing increased resulting reduced permeability. Overall, significance this correct deviation at laboratory setting case mantle-source reservoir. work be applied homogeneity sweet spots regions activities. However, due limitation content range (about 15%–70%) case, unable low-concentration may generalizability work. Besides, formation temperature pressure, salinity water, should considered when dealing other cases.

Language: Английский

Helium isotopes in geothermal fluids reveal off-rift plume degassing and localized seismicity-induced processes in North Iceland DOI
Carolina Dantas Cardoso, Raphaël Pik, Antonio Caracausi

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский

Citations

0
Gas equilibrium in the H2O-H2-CO2-CO-CH4 system for wet-steam geothermal-well fluids and their sources: A case study from Krafla, Iceland DOI Creative Commons
Giulio Bini, Matteo Lelli, Stefano Caliro

et al.

Geothermics, Journal Year: 2025, Volume and Issue: 130, P. 103322 - 103322

Published: March 19, 2025

Language: Английский

Citations

0
Isotopic and kinetic constraints on methane origins in Icelandic hydrothermal fluids DOI
Andri Stefánsson, Andrea Ricci, Mark H. Garnett

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2024, Volume and Issue: 373, P. 84 - 97

Published: March 27, 2024

Language: Английский

Citations

3
Soil CO2 emission and stable isotopes (δ13C, δ18O) of CO2 and calcites reveal the fluid origin and thermal energy in the supercritical geothermal system of Krafla, Iceland DOI Creative Commons
Giulio Bini, Giovanni Chiodini, Tullio Ricci

et al.

Journal of Volcanology and Geothermal Research, Journal Year: 2024, Volume and Issue: 447, P. 108032 - 108032

Published: Feb. 17, 2024

The Krafla geothermal system is located within a volcanic center that periodically erupts basaltic lavas, and has recently attracted an economic interest due to supercritical fluids forming near shallow magma intrusion (∼ 2 km depth). Here, we discuss new soil CO2 flux stable isotope data of the efflux (δ13C) hydrothermal calcites (δ13C, δ18O) drill cuttings estimate both current magmatic outgassing from soils thermal flows in system. Soil emission controlled by tectonics, following NNE-SSW fissure swarm direction WSW-ENE trend, accounts for ∼62.5 t d−1. While δ18O H2O equilibrium with deep predominantly meteoric, δ13C which calcite precipitated have clear origin, overlapping estimated Icelandic mantle (−2.5 ± 1.1 ‰). Estimates based on southern part show these fluxes might be sustained ascent depressurization energy ∼800 MW. Such significant amount reach 1.5 GW if conditions extended below whole investigated area. Finally, report increase about 3 times respect 14 years ago, likely recent changes fluid extracted power production or activity. Pairing isotopes samples important implications volcano monitoring exploration, as it can help us track upflows associated energy.

Language: Английский

Citations

2
Distributions and accumulation mechanisms of helium in petroliferous basins DOI
Pengpeng Li, Quanyou Liu, Dongya Zhu

et al.

Science China Earth Sciences, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 5, 2024

Language: Английский

Citations

2
Decades of subsidence followed by rapid uplift: Insights from microgravity data at Askja Volcano, Iceland DOI
Mathijs Koymans, Elske de Zeeuw‐van Dalfsen, Josefa Sepúlveda

et al.

Journal of Volcanology and Geothermal Research, Journal Year: 2023, Volume and Issue: 442, P. 107890 - 107890

Published: Aug. 22, 2023

Language: Английский

Citations

5
Magmatic Controls on Volcanic Sulfur Emissions at the Iceland Hotspot DOI Creative Commons
Eemu Ranta, Sæmundur A. Halldórsson, Bergrún Arna Óladóttir

et al.

Geochemistry Geophysics Geosystems, Journal Year: 2024, Volume and Issue: 25(5)

Published: May 1, 2024

Abstract Outgassing of sulfur (as SO 2 ) is one the principal hazards posed by volcanic eruptions. However, S emission potentials most volcanoes globally are poorly constrained due to a short observational record and an incomplete understanding magmatic processes that influence pre‐eruptive concentrations. Here, we use compilation published new data from melt inclusions (MIs)—which can preserve concentrations prior eruptive degassing—from Iceland hotspot evaluate effects mantle melting crustal on budgets Icelandic melts. We MI estimate (Δ max, in ppm S) for 73 eruptions 22 Iceland's presently active ∼33 systems. show systematics melts strongly regulated sulfide solubility limit. Sulfide‐saturated conditions during lower‐degree melting, prevalent at off‐rift zones, likely explains observed decoupling between Cl. During differentiation, local maximum modeled occurs evolved basalts (4–6 wt.% MgO), coinciding with highest Highest Δ max values (2,100–2,600 ppm) found Hekla 1913 CE, Eldgjá 939 Surtsey 1963–1967 CE South Volcanic Zone. Our results extend emissions back time be used assess gas where no direct measurements available. Broadly, underline governing role saturation magma differentiation controlling eruptible contents magmas.

Language: Английский

Citations

0
含油气盆地氦气分布特征与成藏机制 DOI Open Access

朋朋 李,

全有 刘,

东亚 朱

et al.

SCIENTIA SINICA Terrae, Journal Year: 2024, Volume and Issue: 54(10), P. 3195 - 3218

Published: June 19, 2024

氦气是一种不可替代的战略性矿产资源,全球的商业性富氦气藏(He>0.1%)都是在油气勘探过程中偶然发现的。通过对全球75个富氦气田和1048个天然气样品统计分析发现,天然气中氦气普遍具有"稀"、"伴"和"杂"的特征,富氦气田的埋深通常小于4500m。He-CH4和He-CO2气田的氦气含量明显低于He-N2气田(He>1%)。然而,前两种气田的氦气地质储量主要为107~1011m3量级,而后者仅为105~107m3量级。氦气与烃类气体在成因和运移方式存在显著的差异。氦气聚集以及长距离运移必须借助载体(地层水、烃类流体、N2、幔源流体等),氦气的运移通道不局限在沉积地层,可延伸至盆地基底、下地壳、甚至岩石圈地幔。然而,氦气与烃类气体的成藏条件几乎可视为等同。烃类气体的存在不仅促进含氦流体中氦气快速解析和高效聚集,而且降低了氦气扩散性能、减少逸散通量。膏盐岩和厚层泥页岩作为盖层,有利于氦气在地质时间尺度下长期保存。大型富氦气田集中分布在古老克拉通盆地的隆起区及其周缘,几乎全部为壳源型。根据He含量与He/N2比值图版,壳源型氦气藏可划分为基岩供氦性、基岩-沉积岩联合供氦型和沉积岩供氦型。综合考虑我国的氦气品位、氦气资源禀赋、天然气工业化进程,以及目前的氦气提纯工艺,中、西部鄂尔多斯、塔里木、四川和柴达木盆地的富氦气田是氦气工业提取优先部署区域,部分(特)大型含氦气田可作为重要接替区域。

Citations

0
The impacts of CO2 on sandstone reservoirs in different fluid environments: insights from mantle-derived CO2 gas reservoirs in Dongying Sag, Bohai Bay Basin, China DOI Creative Commons
Maoyun Wang, Zeng Jian, Chuanming Li

et al.

Frontiers in Earth Science, Journal Year: 2024, Volume and Issue: 12

Published: Nov. 7, 2024

Introduction Mantle-derived CO 2 , as an important component of hydrothermal fluids, is widely distributed in petroliferous basins. While previous experimental studies have suggested that can improve sandstone reservoir quality through mineral dissolution open fluid setting, they overlooked its nagetive effects to by carbonate cementation. Additionally, the roles various environments -reservoir interactions not been studied detail. Methods To systematically investigate influences on reservoirs, we examine a typical mantle-derived gas reservoir, Bohai Bay Basin, China. This study employs integrated methods, including electron microscopy, scanning X-ray diffraction, stable C- and O-isotope analysis, physical property data. The aim evidence mechanisms which impacts particularly focusing closed environments. Results Discussion Our findings reveal dawsonite ankerite are prevalent within while isotopic analysis cements indicates values (δ 13 C: −9.0‰ −1.6‰; δ 18 O: −21.7‰ −12.7‰) consistent with fluids. These pieces indicate -rich fluids participate water-rock interactions, thereby significantly influencing diagenesis reservoirs. Further, notice reservoirs adjacent faults exhibit environment, characterized superior porosity permeability, more quartz, but fewer feldspar, carbonate, clay minerals compared those Notably, kaolinite predominates environments, illite/smectite (I/S) common settings. dual highlighted our analysis: it enhances storage permeability dissolution, cement generated -water-rock interaction also adversely affect quality. In facilitates feldspar minerals, promoting timely removal by-products (clay mineral) inhibiting cementation, improving properties. Conversely, decreasing concentrations depth leads diminishing increased resulting reduced permeability. Overall, significance this correct deviation at laboratory setting case mantle-source reservoir. work be applied homogeneity sweet spots regions activities. However, due limitation content range (about 15%–70%) case, unable low-concentration may generalizability work. Besides, formation temperature pressure, salinity water, should considered when dealing other cases.

Language: Английский

Citations

0