Petroleum Science >2013,??Issue 4:??494-499 DOI: https://doi.org/10.1007/s12182-013-0300-7
Factors influencing pore-pressure prediction in complex carbonates based on effective medium theory Open?Access
文章信息
作者：Wang Ruihe,Wang Zizhen,Shan Xun,Qiu Hao and Li Tianyang
作者單位：
School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China;School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China;School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China;School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China;School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China
投稿時間：2013-06-15
引用方式：Wang, R., Wang, Z., Shan, X. et al. Pet. Sci. (2013) 10: 494. https://doi.org/10.1007/s12182-013-0300-7
文章摘要
A calculation model based on effective medium theory has been developed for predicting elastic properties of dry carbonates with complex pore structures by integrating the Kuster-Toksǒz model with a differential method. All types of pores are simultaneously introduced to the composite during the differential iteration process according to the ratio of their volume fractions. Based on this model, the effects of pore structures on predicted pore-pressure in carbonates were analyzed. Calculation results indicate that cracks with low pore aspect ratios lead to pore-pressure overestimation which results in lost circulation and reservoir damage. However, moldic pores and vugs with high pore aspect ratios lead to pore-pressure underestimation which results in well kick and even blowout. The pore-pressure deviation due to cracks and moldic pores increases with an increase in porosity. For carbonates with complex pore structures, adopting conventional pore-pressure prediction methods and casing program designs will expose the well drilling engineering to high uncertainties. Velocity prediction models considering the influence of pore structure need to be built to improve the reliability and accuracy of pore-pressure prediction in carbonates.
關鍵詞
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Carbonates, effective medium theory, elastic properties, pore-pressure prediction, pore structure