Pore Distribution Characteristics of the Igneous Reservoirs in the Eastern Sag of the Liaohe Depression

Liu, Zongli; Wang, Zhuwen; Dapeng, Zhou; Zhao, Shuqin; Min, Xiang

doi:10.1515/geo-2017-0014

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…The cumulative porosity data "PS3, PS5, PS7, …, PS50" represent porosity values of "≤0.03, 0.05, 0.07, …, ≤0.5", etc., and the porosity bins were obtained, as shown by the various colors in the seventh track in Figure 3. On the basis of the number and concentration of porosity bins, reservoir heterogeneity can be qualitatively analyzed [20,21,32]. The more porosity bins there are, the more scattered the pores are, and the stronger the heterogeneity is.…”

Section: Porosity Spectra Porosity Bins Porosity Variation Coefficien...mentioning

confidence: 99%

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Study on the Reservoir Heterogeneity of Different Volcanic Facies Based on Electrical Imaging Log in the Liaohe Eastern Sag

Liu

Wu²,

Zhang

et al. 2023

Processes

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The volcanic rocks of the Es3 Formation (the third member of the Eocene Shahejie) in the Liaohe Eastern Sag can be divided into four facies and twelve subfacies. The porosity spectrum, porosity bin, variation coefficient (VC), and porosity width derived from electrical imaging log data were applied to study and characterize the heterogeneity of four facies and nine subfacies, both qualitatively and quantitatively. However, the VC and porosity width cannot be used to quantitatively classify heterogeneity when the VC is small and the porosity width is large. In the present study, the authors propose a new parameter, Pvcd = variation coefficient × porosity width. Based on this parameter, using a combination of porosity spectra, porosity bin features, VC, and porosity width, lithofacies heterogeneity is divided into three categories. The first is weak heterogeneity, which has a Pvcd < 1.1, a VC < 0.15, and a porosity width < 6. The second is moderate heterogeneity, which has a Pvcd 1.1–1.6, a VC 0.15–0.25, and a porosity width 6–9. The third is strong heterogeneity, which has a Pvcd > 1.6, a porosity VC > 0.25, and a porosity width > 9. In these three cases, the porosity spectra mainly display unimodal features, the porosity bins are concentrated, the bimodal features with tails and porosity bins are less concentrated, or the multimodal features with tails and porosity bins are scattered, respectively. Favorable reservoirs of volcanic rocks are controlled by lithofacies. In the study area, the favorable reservoirs appear to be the diatreme subfacies with low or medium heterogeneity, the pyroclastic flow subfacies with low heterogeneity, the compound lava flow subfacies with low or medium heterogeneity, and the outer zone subfacies with strong heterogeneity.

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Section: Porosity Spectra Porosity Bins Porosity Variation Coefficien...mentioning

confidence: 99%

“…These core experiments provide valuable and accurate results. However, due to the strong heterogeneity of volcanic rocks, the results of tests on rock cores cannot always reflect the pore characteristics of reservoirs [20,21]. Additionally, coring operations and the subsequent analyses are both expensive and time-consuming.…”

Section: Introductionmentioning

confidence: 99%