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Characteristics of water alternating CO_(2)injection in low-permeability beach-bar sand reservoirs

Energy Geoscience 2024年第1期5卷 224-229页

作者： Maolei Cui Rui Wang Zengmin Lun Chengyuan Lv State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing100083China Key Laboratory of Marine Oil and Gas Reservoir Production SINOPECBeijing100083China Petroleum Exploration and Development Research Institute SINOPECBeijing100083China

Water flooding can be ineffective in highly heterogeneous low-permeability beach-bar sand *** introduction of CO_(2)flooding helps boost the oil production of the reservoirs but only in an early *** the late stage of flooding,gas channeling would *** alternating gas(CO_(2))(WAG)process can be used to delay gas channeling and improve the effect of CO_(2)injection,though its adaptability to beach-bar sand reservoirs remains *** order to clarify CO_(2)injection characteristics in these reservoirs,experiments were carried out in high-temperature high-pressure NMR on-line displacement experiment apparatus to simulate different flooding modes on synthetic cores that can reflect the vertical heterogeneity of beach-bar *** CO_(2)injection modes were implemented on these cores and the displacement characteristics and residual oil distribution features during both WAG injection and continuous CO_(2)injection were analyzed quantitatively and *** results show that the scheme of WAG injection after continuous CO_(2)injection can obtain better oil displacement efficiency than that of the scheme of continuous CO_(2)injection after WAG injection,but there is no significant difference in respect of oil displacement efficiency of WAG flooding between the mode of bar-injection e beach-production(injection into bar sand e production from beach sand)and the mode of beach-injection e beach-production(injection into and production from beach sand),with the former mode having a higher oil recovery *** wider pore-size distribution range of microscopic residual oil after WAG injection shows great potential of enhancing oil recovery from subsequent continuous gas *** WAG injection is implemented prior to continuous CO_(2)injection,the displacement effect of the latter is more *** research may provide a theoretical basis for CO_(2)EOR in this type of reservoirs.

关键词： beach-bar sand Low permeability CO_(2)injection WAG NMR

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An improved Gaussian frequency domain sparse inversion method based on compressed sensing

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Applied Geophysics 2020年第3期17卷 443-452页

作者： Liu Yang Zhang Jun-Hua Wang Yan-Guang Liu Li-Bin Li Hong-Mei School of Geosciences China University of Petroleum(East China)Qingdao 266580China Geophysical Research Institute of Shengli Oilfi eld Branch Company SinopecDongying 257022China.

The traditional compressed sensing method for improving resolution is realized in the frequency *** method is aff ected by noise,which limits the signal-to-noise ratio and resolution,resulting in poor *** solve this problem,we improved the objective function that extends the frequency domain to the Gaussian frequency domain having denoising and smoothing ***,the reconstruction of the sparse refl ection coeffi cient is implemented by the mixed L1_L2 norm algorithm,which converts the L0 norm problem into an L1 norm ***,a fast threshold iterative algorithm is introduced to speed up convergence and the conjugate gradient algorithm is used to achieve debiasing for eliminating the threshold constraint and amplitude *** model test indicates that the proposed method is superior to the conventional OMP and BPDN *** not only has better denoising and smoothing eff ects but also improves the recognition accuracy of thin *** actual data application also shows that the new method can eff ectively expand the seismic frequency band and improve seismic data resolution,so the method is conducive to the identifi cation of thin interbeds for beach-bar sand reservoirs.

关键词： Compressed sensing Gaussian frequency domain L1-L2 norm thin interbeds beach-bar sand resolution signal-to-noise ratio

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