Defining Potentially-Productive Intervals and Evaluating Petrophysical Properties of the Tight-Oil Bazhenov Formation in Western Siberia Using a Suite of Modern Wireline Logs

Melnikov, L. P.; Martinov, M.E.; Demin, V. M.; Черевко, М А; Zaray, E.A.; Ezersky, D. M.; Karpekin, E. A.; Weinheber, Peter; Filimonov, Anton; Новиков, С. В.; Blinov, V. A.; Mikhaltseva, Irina

doi:10.2118/176698-ms

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…However, we observed that the sum of P Oil-1 and P Oil-2 shows a negative correlation with the percentage of saturated hydrocarbons and OSI but a positive correlation with the percentage of NSO com- practices (Jarvie, 2012(Jarvie, , 2015Melnikov et al, 2015), we argue that multi-step programmed pyrolysis is not suitable for evaluating the mobility of oil in low OSI shale, such as the Chang7 shale.…”

Section: Limitations Of Multi-step Programmed Pyrolysismentioning

confidence: 73%

“…OSI values above 100 mg/g are used to identify potential reservoirs with recoverable oil in both conventional and unconventional oil systems (Jarvie, 2012;Lopatin et al, 2003). The successful application of OSI in identifying productive intervals has been demonstrated in various fields in the USA and Russia (Jarvie, 2012;Melnikov et al, 2015).…”

Section: Influence Of Petroleum Loss On Osimentioning

confidence: 99%

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Impact of petroleum expulsion and evaporation losses on shale oil assessment using pyrolysis techniques

You,

Liu,

Song

et al. 2023

Geological Journal

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Shale reservoirs contain petroleum that undergoes losses through oil expulsion and evaporation, with uncertain implications on shale oil reserves and mobility evaluation. This study focuses on understanding the influence of these losses on open‐system pyrolysis, the primary method for assessing shale oil content and mobility. Comprehensive analyses were performed on 26 lacustrine shale samples from the Chang7 Member, encompassing total organic carbon (TOC), programmed pyrolysis, solvent extraction, and gas chromatography–mass spectrometry (GC–MS). The research examines the impact of petroleum losses on petroleum fractions, the oil saturation index (OSI), and multi‐step pyrolysis outcomes. The findings indicate that Chang7 shale with TOC content above 7% experiences more substantial petroleum losses than those with TOC below 7%. Petroleum losses result in significant fractional distillation of crude oil in the shale, leading to the deterioration of shale oil properties and a notable reduction in free oil content in S1, ultimately causing a decline in OSI values. As a result, Chang7 shale with TOC below 7% demonstrates a higher potential for shale oil recovery, whereas Chang7 shale with TOC exceeding 7% should be considered more significant as a hydrocarbon source rock. Moreover, multi‐step pyrolysis is not suitable for assessing petroleum mobility in shale with low free oil content (OSI values below 100 mg/g). This limitation arises from the loss of free low‐boiling components in Chang7 shale, and the currently detected low‐boiling pyrolysis products may predominantly exist in an adsorbed state.

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Section: Limitations Of Multi-step Programmed Pyrolysismentioning

confidence: 73%

Section: Influence Of Petroleum Loss On Osimentioning

confidence: 99%

Impact of petroleum expulsion and evaporation losses on shale oil assessment using pyrolysis techniques

You,

Liu,

Song

et al. 2023

Geological Journal

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“…The OSI value appears to be linked to oil mobility in shale, with free oil exhibiting greater mobility than adsorbed oil. Production outcomes from various shale oil plays in the United States and Russia have confirmed that an OSI value greater than 100 mg/g serves as a reliable criterion for identifying productive intervals [4,89]. The OSIcorr represents the correction value for OSI calculated using Equation (5).…”

Section: The Relationship Between Pores and Free Oil Enrichmentmentioning

confidence: 99%

Impacts of Pore Structure on the Occurrence of Free Oil in Lacustrine Shale Pore Networks

You,

Liu,

Sun

et al. 2023

Energies

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The ultimate recovery of shale oil is mostly dependent upon the occurrence and content of free oil within the nano-scaled pore network of shale reservoirs. Due to the nanoporous nature of shale, quantitatively characterizing the occurrence and content of free oil in shale is a formidable undertaking. To tackle this challenge, 12 lacustrine shale samples with diverse organic matter content from the Chang7 Member in the southern Ordos Basin were selected, and the characteristics of free oil occurrence were indirectly characterized by comparing changes in pore structure before and after organic solvent extraction. The free oil enrichment in shale was assessed using the oil saturation index (OSI), corrected oil saturation index (OSIcorr), and percentage of saturated hydrocarbons. The results revealed that slit-like interparticle pores with diameters less than 30 nm are dominant in the Chang7 shale. Conceptual models for the pore structures containing free oil were established for shale with total organic carbon (TOC) content less than 9% and greater than 9%, respectively. Shale samples with TOC content less than 9% exhibit a well-developed pore network characterized by relatively larger pore volume, surface area, and heterogeneity. Conversely, shale samples with TOC content exceeding 9% display a less developed pore network characterized by relatively smaller pore volume, surface area, and heterogeneity. Larger pore volume and lower organic matter abundance favor the enrichment of free oil within the lacustrine shale pore network. This study may have significant implications for understanding oil transport in shales.

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Defining Potentially-Productive Intervals and Evaluating Petrophysical Properties of the Tight-Oil Bazhenov Formation in Western Siberia Using a Suite of Modern Wireline Logs

Cited by 2 publications

References 10 publications

Impact of petroleum expulsion and evaporation losses on shale oil assessment using pyrolysis techniques

Impact of petroleum expulsion and evaporation losses on shale oil assessment using pyrolysis techniques

Impacts of Pore Structure on the Occurrence of Free Oil in Lacustrine Shale Pore Networks

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