CO2 storage capacity estimation under geological uncertainty using 3-D geological modeling of unconventional reservoir rocks in Shahejie Formation, block Nv32, China

Abstract

Underground CO2 storage is a promising technology for mitigating climate change. In this vein, the subsurface condition was inherited a lot of uncertainties that prevent the success of the CO2 storage project. Therefore, this study aims to build the 3D model under geological uncertainties for enhancing CO2 storage capacity in the Shahejie Formation (Es1), Nv32 block, China. The well logs, seismic data, and geological data were used for the construction of 3-D petrophysical models. The target study area model focused on four units (Es1 × 1, Es1 × 2, Es1 × 3, and Es1 × 4) in the Shahejie Formation. Well logs were utilized to predict petrophysical properties; the lithofacies indicated that the Shahejie Formation units are sandstone, shale, and limestone. Also, the petrophysical interpretation demonstrated that the $$Es1$$ E s 1 reservoir exhibited high percentage porosity, permeability, and medium to high net-to-gross ratios. The static model showed that there are lateral heterogeneities in the reservoir properties and lithofacies; optimal reservoir rocks exist in Es1 × 4, Es1 × 3, and Es1 × 2 units. Moreover, the pore volume of the Es1 unit was estimated from petrophysical property models, ranging between 0.554369 and 10.03771 × 106 sm3, with a total volumetric value of 20.0819 × 106 sm3 for the four reservoir units. Then, the 100–400 realizations were generated for the pore volume uncertainties assessment. In consequence, 200 realizations were determined as an optimal solution for capturing geological uncertainties. The estimation of CO2 storage capacity in the Es1 formation ranged from 15.6 to 207.9 × 109 t. This result suggests the potential of CO2 geological storage in the Shahejie Formation, China.

Techno-socio-economic analysis of geological carbon sequestration opportunities

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Experimental and Molecular Dynamics Simulation to Investigate Oil Adsorption and Detachment from Sandstone/Quartz Surface by Low-Salinity Surfactant Brines

“…Understanding the behavior of polar compounds in crude oil and their interaction with brine cations at the interface is crucial for comprehending the effect of salinity on oil–brine interfaces, which is a focus of this study. The wetting condition on rock surfaces is greatly influenced by the adsorption of organic components from the oils, either through physical or chemical alteration of the rock texture, thereby affecting oil flow, detachment, storage, and recovery . Asphaltenes and resin fractions present in crude oil strongly adsorb onto clean rock surfaces and alter their wettability .…”

CO2 Sequestration and Enhanced Oil Recovery via the Water Alternating Gas Scheme in a Mixed Transgressive Sandstone-Carbonate Reservoir: Case Study of a Large Middle East Oilfield

“…Carbon capture, utilization, and storage (CCUS) is an effective technology to mitigate carbon dioxide (CO 2 ) emissions into the atmosphere to alleviate global warming and climate. , CO 2 storage in sedimentary formations (e.g., depleted oil and gas reservoirs, saline aquifers, and coal bed seams) is one of the most adopted CCUS technology. , Approximately 28 MtCO 2 /year of captured CO 2 are injected into the sedimentary formations for CO 2 -enhanced oil recovery (CO 2 -EOR), and about 85% of those CO 2 -EOR projects adopt CO 2 sourced from natural CO 2 gas fields . Advanced CO 2 -EOR technologies have created the possibility of CO 2 separation from the produced oil and re-injected into the formation, which optimizes the potential of CO 2 storage in depleted oil reservoirs during CO 2 -EOR .…”