The capillary pressure curve is one of the main tools to study the rock pore structure. On the basis of an oil-bearing shaly sandstone volume model and the HSK equation, combined with experimental data of the semi-permeable membrane and the mercury injection capillary pressure curves and the cation exchange capacity, the influence of the clay bound water on the capillary pressure curve is analyzed, and a method of correcting the mercury injection capillary pressure curve is proposed. It is shown that for the shaly sands, under the conditions of low salinity of the formation water and high cation exchange capacity, the mercury injection capillary pressure curve and the semi-permeable membrane capillary pressure curve are different. The mercury injection capillary pressure curves of six samples are corrected by using the method. For the shaly sands of medium to high porosity and permeability, the mercury injection capillary pressure curves after correction can better reflect the pore structure of the actual reservoir; for the shaly sands of low porosity and permeability, the correction method proposed in this paper is not suitable.
ZHANG Chong
,
ZHANG Chaomo
,
ZHANG Zhansong
,
HUANG Cheng
,
MAO Zhiqiang
. Effect of Clay Bound Water on the Mercury Injection Capillary Pressure Curves and the Correction[J]. Science & Technology Review, 2014
, 32(2)
: 44
-49
.
DOI: 10.3981/j.issn.1000-7857.2014.2.007
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