The Probe in Porosity Calculation Method of Fractured and Caved Reservoirs in Feixianguan Formation,Northeastern Sichuan Basin

Abstract

Abstract: The reservoirs of Feixianguan formation in Northeastern Sichuan Basin are typical fractured and caved ones which are characterized by complicated lithology, complicated reservoir space and strong heterogeneity. Porosity calculation directly with three porosity log curves is pretty difficult to meet the need because the characteristics have great impact on conventional log response. Hence, the concept of porosity calculation method is put forward by establishing computation model under the exactly identifying lithology with the method of Pe （U） and three porosity curve intersection with combining specific geologic characeristic of Feixianguan formation in Northeastern Sichuan Basin and discussion of the influence of three porosity curves by fracture and cave is done. The calculation accuracy of porosity has been improved greatly by verifying with field data.

Key words: reservoir space, heterogeneity, fractured and caved reservoirs, lithological identification, porosity calculation

SIMA Li -qiang et al. The Probe in Porosity Calculation Method of Fractured and Caved Reservoirs in Feixianguan Formation,Northeastern Sichuan Basin[J]. 西南石油大学学报(自然科学版), 2008, 30(2): 1-4.

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The Probe in Porosity Calculation Method of Fractured and Caved Reservoirs in Feixianguan Formation,Northeastern Sichuan Basin

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