Controlling factors for shale gas enrichment and their implications for favorable exploration areas: Insights from the Wufeng–Longmaxi Formations, Southern Sichuan, China DOI Creative Commons
Zhenwei Zou,

Jinghao Fu,

Hu Li

и другие.

PLoS ONE, Год журнала: 2025, Номер 20(5), С. e0323277 - e0323277

Опубликована: Май 23, 2025

The exploration and development of shale gas in the Wufeng-Longmaxi Formations (WF-LMX FM) Southern Sichuan Basin exhibit pronounced spatial heterogeneity with 3–5 fold content variations strata meeting identical static thresholds (TOC > 2.5wt.%, porosity >5%). This exposes a fundamental disconnect conventional models that dissociate geochemical potential from tectonic preservation dynamics post-mature systems (Ro 3.0%). spatiotemporal decoupling is resolved through process-contingent integration three critical determinants: thermal maturation trajectories, hydrocarbon generation-preservation windows, multi-phase stress imprinting, fracture connectivity enhancement observed at reduced brittleness (~35%) via pre-existing microfracture networks inherited deformation events. study establishes pioneering multivariate evaluation framework integrating well logs, 3D seismic interpretation, experimental petrology to decode five governing parameters: Total Organic Carbon (TOC), maturity (Ro), porosity, mineral brittleness, index (SP) resolves TOC-Ro-gas by quantifying fault throw/erosion rate equilibrium calibrated bed thickness anomalies. Systematic analysis reveals optimal enrichment necessitates threshold recalibration beyond paradigms-TOC 4.0wt.% redefines high-maturity regimes, while 3.0-4.0% Ro window balances organic evolution against carbon deposition-induced occlusion. Reservoir viability further constrained >4.5% for storage capacity >40% brittle minerals sustainability. SP index, incorporating erosional magnitude connectivity, identifies two risk zones near Changning anticline northern Luzhou, where neotectonic reactivation disrupts overpressure maintenance. Spatial synthesis these constraints delineates strategic targets: NW-SE trending Jianwu-Weiyuan slope system exhibiting thermal-structural synergy, Luzhou anticlinal cluster sealing sustains efficacy. model “geochemical paradox” dynamic process coupling, establishing transformative paradigm deep thrust-fold terrains.

Язык: Английский

Ultradeep Nonhydrocarbon Gases: Geochemical Characteristics and Origins DOI Creative Commons
Mingming Jiang, Quanyou Liu

Journal of GeoEnergy, Год журнала: 2025, Номер 2025(1)

Опубликована: Янв. 1, 2025

Nonhydrocarbon gases are significant components of natural gas, and their concentration levels crucial factors affecting reservoir development value. While explorations have progressively moved from shallow to deep now ultradeep reservoirs, research on the geochemical characteristics nonhydrocarbon in such extreme depths remains limited, leaving origins types poorly understood. This paper analyzes (CO 2 , H S, N He, ) across major global basins determine origins. CO concentrations reach up ~40% but generally below ~15%. The increases with depth, primarily due inorganic origins, thermochemical sulfate reduction (TSR) magmatic being main causes. Depths mainly between 6000 7100 m. peak at ~26% ~6%. It originates crustal sources high‐temperature cracking sedimentary organic matter during postmature. ~1.6% ~0.2%. is concentrated 7800 m may a biological origin. He ~0.07% found 7700 fall well short commercial threshold (0.1%), indicating limited potential for enrichment reservoirs. S 46% 10%. slightly TSR processes. ~7600 Understanding these common varying patterns provide theoretical guidance future exploration targets like .

Язык: Английский

Процитировано

0
Applications of light hydrocarbons in petroleum geochemistry:A review DOI
Donglin Zhang, Meijun Li,

Rongzhen Qiao

и другие.

Earth-Science Reviews, Год журнала: 2025, Номер unknown, С. 105164 - 105164

Опубликована: Май 1, 2025

Язык: Английский

Процитировано

0
Controlling factors for shale gas enrichment and their implications for favorable exploration areas: Insights from the Wufeng–Longmaxi Formations, Southern Sichuan, China DOI Creative Commons
Zhenwei Zou,

Jinghao Fu,

Hu Li

и другие.

PLoS ONE, Год журнала: 2025, Номер 20(5), С. e0323277 - e0323277

Опубликована: Май 23, 2025

The exploration and development of shale gas in the Wufeng-Longmaxi Formations (WF-LMX FM) Southern Sichuan Basin exhibit pronounced spatial heterogeneity with 3–5 fold content variations strata meeting identical static thresholds (TOC > 2.5wt.%, porosity >5%). This exposes a fundamental disconnect conventional models that dissociate geochemical potential from tectonic preservation dynamics post-mature systems (Ro 3.0%). spatiotemporal decoupling is resolved through process-contingent integration three critical determinants: thermal maturation trajectories, hydrocarbon generation-preservation windows, multi-phase stress imprinting, fracture connectivity enhancement observed at reduced brittleness (~35%) via pre-existing microfracture networks inherited deformation events. study establishes pioneering multivariate evaluation framework integrating well logs, 3D seismic interpretation, experimental petrology to decode five governing parameters: Total Organic Carbon (TOC), maturity (Ro), porosity, mineral brittleness, index (SP) resolves TOC-Ro-gas by quantifying fault throw/erosion rate equilibrium calibrated bed thickness anomalies. Systematic analysis reveals optimal enrichment necessitates threshold recalibration beyond paradigms-TOC 4.0wt.% redefines high-maturity regimes, while 3.0-4.0% Ro window balances organic evolution against carbon deposition-induced occlusion. Reservoir viability further constrained >4.5% for storage capacity >40% brittle minerals sustainability. SP index, incorporating erosional magnitude connectivity, identifies two risk zones near Changning anticline northern Luzhou, where neotectonic reactivation disrupts overpressure maintenance. Spatial synthesis these constraints delineates strategic targets: NW-SE trending Jianwu-Weiyuan slope system exhibiting thermal-structural synergy, Luzhou anticlinal cluster sealing sustains efficacy. model “geochemical paradox” dynamic process coupling, establishing transformative paradigm deep thrust-fold terrains.

Язык: Английский

Процитировано

0