Application of NMR Logging to Reservoir Characterization of Low-Resistivity Sands in the Gulf of Mexico1

Hodgkins, Margaret A.; Howard, James W.

doi:10.1306/00aa9a16-1730-11d7-8645000102c1865d

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Therefore, the T 2 distribution can be calibrated to the PSD. Previously, many researchers directly overlapped the PTD derived from MICP to the T 2 distribution to obtain the PSD, based on the similarity of PTD and PSD in conventional reservoirs [23,[60][61][62]. However, the PSD and PTD tend to present obvious differences due to the complex pore structure in tight sandstone reservoirs, which makes the reliability of calibrated PSD for this method low or even incorrect.…”

Section: Calibration Of Psdmentioning

confidence: 99%

“…Low-field nuclear magnetic resonance (NMR) is an important method for evaluating pore structure, fluid properties, and petrophysical properties of rocks [16][17][18][19][20][21]. This technique was widely used in the evaluation of various petroleum reservoirs, such as clastic rocks, carbonate rocks, and volcanic rocks, for nearly five decades [11,[22][23][24][25]. In recent years, it has become an indispensable tool for characterizing reservoir properties, such as PSD, porosity, permeability, wettability, fluid movability, and saturation, due to the nondestructive feature, convenience in sample processing, and short test time [6,[26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Pore Size Distribution Characterization by Joint Interpretation of MICP and NMR: A Case Study of Chang 7 Tight Sandstone in the Ordos Basin

Liu

You

et al. 2022

Processes

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Pore size distribution characterization of unconventional tight reservoirs is extremely significant for an optimized extraction of petroleum from such reservoirs. In the present study, mercury injection capillary pressure (MICP) and low-field nuclear magnetic resonance (NMR) are integrated to evaluate the pore size distribution of the Chang 7 tight sandstone reservoir. The results show that the Chang 7 tight sandstones are characterized by high clay mineral content and fine grain size. They feature complex micro-nano-pore network system, mainly composed of regular primary intergranular pores, dissolved pores, inter-crystalline pores, and micro-fractures. Compared to the porosity obtained from MICP, the NMR porosity is closer to the gas-measured porosity (core analysis), and thus can more accurately describe the total pore space of the tight sandstone reservoirs. The pore throat distribution (PTD) from MICP presents a centralized distribution with high amplitude, while the pore size distribution (PSD) derived from NMR shows a unimodal distribution or bimodal distribution with low amplitude. It is notable that the difference between the PSD and the PTD is always related to the pore network composed of large pores connecting with narrow throats. The PSD always coincides very well with the PTD in the very tight non-reservoirs with a much lower porosity and permeability, probably due to the pore geometry that is dominated by the cylindrical pores. However, a significant inconsistency between the PSD and PTD in tight reservoirs of relatively high porosity and low permeability is usually associated with the pore network that is dominated by the sphere-cylindrical pores. Additionally, Euclidean distance between PSD and PTD shows a good positive correlation with pore throat ratio (PTR), further indicating that the greater difference of pore bodies and pore throats, the more obvious differentiation of two distributions. In summary, the MICP and NMR techniques imply the different profiles of pore structure, which has an important implication for deep insight into pore structure and accurate evaluation of petrophysical properties in the tight sandstone reservoir.

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Section: Calibration Of Psdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pore Size Distribution Characterization by Joint Interpretation of MICP and NMR: A Case Study of Chang 7 Tight Sandstone in the Ordos Basin

Liu

You

et al. 2022

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A novel model for assessing the pore structure of tight sands and its application

Zhou

et al. 2010

Appl. Geophys.

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Pore-structure poses great influence on the permeability and electrical property of tight sand reservoirs and is critical to the petrophysical research of such reservoirs. The uncertainty of permeability for tight sands is very common and the relationship between porestructure and electrical property is often unclear. We propose a new parameter δ, integrating porosity, maximum radius of connected pore-throats, and sorting degree, for investigating the permeability and electrical properties of tight sands. Core data and wireline log analyses show that this new δ can be used to accurately predict the tight sands permeability and has a close relation with electrical parameters, allowing the estimation of formation factor F and cementation exponent m. The normalization of the resistivity difference caused by the porestructure is used to highlight the influence of fluid type on Rt, enhancing the coincidence rate in the Pickett crossplot significantly.

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Late Pliocene gas detection in-between gas zones using total combinable magnetic resonance (TCMR) in Eastern Mediterranean offshore reservoir

et al. 2021

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Application of NMR Logging to Reservoir Characterization of Low-Resistivity Sands in the Gulf of Mexico1

Cited by 4 publications

References 12 publications

Pore Size Distribution Characterization by Joint Interpretation of MICP and NMR: A Case Study of Chang 7 Tight Sandstone in the Ordos Basin

Pore Size Distribution Characterization by Joint Interpretation of MICP and NMR: A Case Study of Chang 7 Tight Sandstone in the Ordos Basin

A novel model for assessing the pore structure of tight sands and its application

Late Pliocene gas detection in-between gas zones using total combinable magnetic resonance (TCMR) in Eastern Mediterranean offshore reservoir

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