Petroleum Science >2014,??Issue 2:??211-219 DOI: https://doi.org/10.1007/s12182-014-0334-5
Analysis of petrophysical cutoffs of reservoir intervals with production capacity and with accumulation capacity in clastic reservoirs Open?Access
文章信息
作者：Wang Yanzhong,Cao Yingchang,Song Guoqi,Song Ling,Yang Tian and Zhang Shaomin
作者單位：
School of Geosciences, China University of Petroleum, Shandong 266580, China;School of Geosciences, China University of Petroleum, Shandong 266580, China;Geological Science Research Institute, Shengli Oilfield, SINOPEC, Shandong 257015, China;Western New Prospect Research Center of Shengli Oilfield, SINOPEC, Shandong 257015, China;School of Geosciences, China University of Petroleum, Shandong 266580, China;School of Geosciences, China University of Petroleum, Shandong 266580, China
投稿時(shí)間：2013-02-28
引用方式：Wang, Y., Cao, Y., Song, G. et al. Pet. Sci. (2014) 11: 211. https://doi.org/10.1007/s12182-014-0334-5
文章摘要
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.
關(guān)鍵詞
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Effective reservoir, petrophysical cutoff of reservoir intervals with production capacity (RIPC), petrophysical cutoff of reservoir intervals with accumulation capacity (RIAC), clastic rocks