Study on Variation Law of Rock Physical Properties After Water Flooding#br#
in Donghe Sandstone

doi:10.11885/j.issn.1674-5086.2013.11.09.02

Abstract

Abstract:

In order to accurately determine the oil saturation of Donghe sandstone after water flooding and then determine
the water flooded layer，in this paper，based on the rock physical experiment，we analyze the variation law of rock electrical
parameters after water flooding with oil driving water and water driving oil experiments. The results show that a and m do
not change and are only related to rock characteristics. Besides，the lithology coefficient b also does not change after water
flooding，but the saturation index n has changed，which decreases in the bad physical property and increases in the good physical
property. According to the variation of rock electrical parameters，we establish the computational models of rock electrical
parameters which improve the computational accuracy of saturation in poor reservoirs. By water driving oil experiments with
different salinity of injected water，the variation law of rock resistivity after water flooding is analyzed. It is noted that reservoir
resistivity decreases with the increase of water saturation after sewage water flooding，and decreases with rising water saturation
after fresh water low and middle flooding，while reservoir resistivity increases with the increase of water saturation after fresh
water high flooding.

Key words: Donghe sandstone, rock electrical parameter, water driving oil, oil driving water, water flooded, pore structure

CLC Number:

TE135

Wang Qian1*, Su Bo1, Song Fan2, Li Zhen1, Yang Fan1. Study on Variation Law of Rock Physical Properties After Water Flooding#br# in Donghe Sandstone[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.11.09.02.

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Study on Variation Law of Rock Physical Properties After Water Flooding#br# in Donghe Sandstone

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