Abstract
Methodologies have been developed for calculating cutoffs of reservoir intervals with production capacity (RIPC) and reservoir intervals with accumulation capacity (RIAC) according to the types of pore throat structures and dynamic force by using data from petrophysical analysis, production tests and mercury injection. The data are from clastic reservoirs in the third member (Es3) and the fourth member (Es4) of the Shahejie Formation in the Shengtuo area on the North Slope of the Dongying Sag, Jiyang Depression, China. The method of calculating cutoffs of RIPC is summarized as follows: 1) determination of permeability cutoffs of RIPC; 2) classification of types of pore-throat structures according to mercury injection data and then relating porosity to permeability and determining the relationship between porosity and permeability according to each type of pore-throat structure; and 3) calculating porosity cutoffs of RIPC using established correlation between porosity and permeability according to the type of pore throat structure. The method of calculating cutoffs of RIAC includes: 1) establishing a functional relationship between oil-water interfacial tension and formation temperature; 2) calculating limiting values of maximum connected pore-throat radii according to formation temperature and dynamic forces of each reservoir interval; 3) correlating permeability with maximum connected pore-throat radius and then obtaining permeability cutoffs of RIAC; and 4) calculating porosity cutoffs on the basis of permeability cutoffs according to specific correlations, suitable for the type of pore-throat structure. The results of this study show that porosity and permeability cutoffs of clastic reservoirs decrease with depth. For a fixed permeability cutoff, the porosity cutoff of RIPC varies because the type of pore throat is different. At a fixed temperature, porosity and permeability cutoffs of RIAC decrease as dynamic force increases. For a fixed permeability cutoff of effective hydrocarbon accumulation, the porosity cutoff also varies with different types of pore throat.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Bouffin N and Jensen J L. Efficient detection of productive intervals in oil and gas reservoirs. Journal of Canadian Petroleum Technology. 2010. 58–63
Cao Y C, Wang Y Z, Xu T Y, et al. The petrophysical parameter cutoff and controlling factors of the effective reservoir of beach and bar sandbodies of the upper part of the fourth member of the Shahejie Formation in west part of Dongying Depression. Acta Sedimentologica Sinica. 2009. 27(2): 230–237 (in Chinese)
Cobb W M and Marek F J. Net pay determination for primary and waterflood depletion mechanisms. 1998. 27–30 (SPE 48952)
Danesh A. PVT and Phase Behavior of Petroleum Reservoir Fluids. Elsevier Science. 1998. 293–300
Gao J G, Gao S X, Wang F H, et al. Characteristics of formation pressure and its influences on reservoirs of the fourth member of the Shahejie Formation in Shengtuo area of Dongying Depression. Petroleum Geology and Recovery Efficiency. 2008. 15(1): 35–38 (in Chinese)
Geng L X, Cao Y S, Yi Z W, et al. A study on petrophysical property cutoffs of sandstone reservoirs in Pucheng oil field. Petroleum Exploration and Development. 1999. 26(1): 81–83 (in Chinese)
Guo R. Supplement to determining method of cut-off value of producible reservoir. Petroleum Exploration and Development. 2004. 31(5): 140–144 (in Chinese)
Hall J E. The importance of a complete suite of logs in an old reservoir. JPT 1983. 1178
Hao F, Zou H Y and Gong Z S. Preferential petroleum migration pathways and prediction of petroleum occurrence in sedimentary basins: Areview. Petroleum Science. 2010. 7: 2–9
Hobson D G. Some Fundamentals of Petroleum Geology. London: Oxford University Press. 1954. 139–150
Jiang Y Q, Gao Y, Xu H W, et al. New method for determining cut-off parameter in hydrophilic and low permeable sandstone reservoir-case of gas reservoir, Hebaochang area. Petroleum Geology and Recovery Efficiency. 2003. 24(2): 162–166 (in Chinese)
Jiao C H, Xia D D, Wang J, et al. Methods for determining the petrophysical property cutoffs of extra-low porosity and permeability sandstone reservoirs-an example from the Xishanyao Formation reservoirs in Yongjin oilfield. Oil & Gas Geology. 2009. 30(3): 379–383 (in Chinese)
Li W H, Liu Y Q and Feng Q. Reservoir characteristics and hydrocarbon accumulation regularity of the Chang 6 oil-bearing beds in the Chuankou Oil Field, Shaanxi Province. Acta Petrologica Sinica. 1998. 14(1): 117–127 (in Chinese)
Liu Z, Huang Y H, Pan G F, et al. Determination of critical properties of low porosity and permeability sandstone reservoir and its significance in petroleum geology. Acta Geologica Sinica. 2012. 86(11): 1815–1825 (in Chinese)
Luo X R. Understandings on dynamical studies of hydrocarbon migration and accumulation. Natural Gas Geoscience. 2008. 19(2): 149–156 (in Chinese)
Luo X R and Vasseur G. Geopressuring mechanism of organic matter cracking: Numerical Modeling. AAPG Bulletin. 1996. 80(6): 856–873
MacKenzie W T. Petrophysical study of the Cardium Sand in the Pembina Field. 1975 (SPE 5541)
Nelson P H. Pore-throat sizes in sandstones, tight sandstones, and shales. AAPG Bulletin. 2009. 93(3): 329–340
Nelson P H and Batzle M L. Single-phase permeability. In: J. Fanchi. Petroleum Engineering Hand-book: General engineering: Richardson, Texas, Society of Petroleum Engineers. 2006. 1: 687–726
Pan G F, Liu Z, Zhao S, et al. The study on lower limit of porosity for oil accumulation in Chang-8 Member, Zhenjing area, Ordos Basin. Geoscience. 2011. 25(2): 271–278 (in Chinese)
Pang X Q, Liu K Y, Ma Z Z, et al. Dynamic field division of hydrocarbon migration, accumulation and hydrocarbon enrichment rules in sedimentary basins. Acta Geologica Sinica. 2012. 86(6): 1559–1592
Qi H F. Cutoffs of gas reservoir parameters and a discussion on deep gas exploration. Natural Gas Industry. 1989. 9(5): 26–29 (in Chinese)
Rockwood S H, Lair G H and Langford B J. Reservoir volumetric parameters defined by capillary pressure studies. AIME. 1957. 210: 252–255
Shao C X, Wang Y Z and Cao Y C. Two new methods used to determine the low limits of effective reservoir physical properties and their applications-A case study on deep clastic reservoir of Palaeogene in Dongying Depression. Journal of Oil and Gas Technology. 2008. 30(2): 414–416 (in Chinese)
Song L. Study on sedimentary characteristics and physical property cutoff of the main sand bodies of Paleogene in Dongying Sag. Qingdao: China University of Petroleum (East China). 2011 (in Chinese)
Tang X Y. Volcano rock reservoir control factors and physical property lower limit in north area of Karamay. Journal of Southwest Petroleum University (Science & Technology Edition). 2011. 33(6): 7–12 (in Chinese)
Wang C, Shao H M, Hong S X, et al. The lower limits of physical properties for deep clastic reservoirs in north Songliao Basin and its relationship with microscopic features. Petroleum Geology & Oilfield Development in Daqing. 2007. 26(5): 18–20 (in Chinese)
Wang J, Cao Y C, Gao Y J, et al. Petrophysical parameter cutoff and controlling factors of effective reservoir of red beds sandbodies of Paleogene in Dongying Depression. Journal of China University of Petroleum (Edition of Natural Science). 2011. 35(4): 27–33 (in Chinese)
Wang X J, Zhao Y S, Xu H W, et al. Stress sensitivity and property lower limit of deliverability in the low-permeability reservoir. Oil & Gas Geology. 2003. 24(2): 162–166 (in Chinese)
Wang Y Z and Cao Y C. Lower property limit and controls on deep effective clastic reservoirs of Paleogene in Chezhen Depression. Acta Sedimentologica Sinica. 2010. 28(4): 752–761 (in Chinese)
Wang Y Z, Cao Y C, Song G Q, et al. Application of production test data to evaluation of the effective reservoir in deep clastic of Bonan Sag. Acta Petrolei Sinica. 2008. 29(5): 701–710 (in Chinese)
Wang Y Z, Cao Y C, Song G Q, et al. Determination of physical property lower limit of deep clastic effective reservoirs of Paleogene in Dongying Depression. Journal of China University of Petroleum (Edition of Natural Science). 2009. 33(4): 16–21 (in Chinese)
Worthington P F. The application of cut-offs in integrated reservoir studies. SPE Reservoir Evaluation and Engineering. 2008. 11(6): 968–975
Worthington P F and Cosentino L. The role of cutoffs in integrated reservoir studies. SPE Reservoir Evaluation & Engineering. 2005 (SPE84387)
Xie G J and Jin Z J. One dimensional numerical simulation of oil-trapping process of original lentoid sand reservoir. Earth Science (Journal of China University of Geosciences). 2008. 33(1): 97–106 (in Chinese)
Zhang C, Jiang Y Q, Guo H G, et al. Determination method of matrix physical property lower limit of effective reservoirs. Natural Gas Industry. 2010. 8(2): 11–16 (in Chinese)
Zhang Y Q, Huang Z L, Gao G, et al. The lower limit values of physical properties for the Mesozoic hydrocarbon carrier beds in the Karamay-Baikouquan area and their relation with petroleum accumulation. Geological Journal of China Universities. 2008. 14(2): 250–255 (in Chinese)
Zhu G Y Jin Q, Zhou J L, et al. Physical properties and genesis of oil in Shengtuo oilfield in Jiyang Depression. Oil & Gas Geology. 2004. 25(1): 9–13 (in Chinese)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wang, Y., Cao, Y., Song, G. et al. Analysis of petrophysical cutoffs of reservoir intervals with production capacity and with accumulation capacity in clastic reservoirs. Pet. Sci. 11, 211–219 (2014). https://doi.org/10.1007/s12182-014-0334-5
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12182-014-0334-5