Occurrence Characteristics of Movable Fluids in Unconsolidated Sandstone Reservoir of Toutunhe Formation in Santai Oilfield

doi:10.7657/XJPG20210411

Abstract

Abstract:

The unconsolidated sandstone reservoir in the Toutunhe formation of Santai oilfield, Junggar basin is characterized by complex pore structures, strong heterogeneity and large difference in fluid distribution. In order to clarify the occurrence characteristics of the movable fluid in the unconsolidated sandstone reservoir, typical core samples were taken from the unconsolidated sandstone reservoir, and tested on their NMR (nuclear magnetic resonance) T₂ spectra before and after centrifugation, and the T₂ cut-offs and saturation of the movable fluid in the reservoir were evaluated quantitatively. The results show that the pore structures in the reservoir of Tou 2 member are complex, and the pore throats are thin and poorly connected; and the T₂ spectra has proved the saturation of the movable fluid ranging from 80.42% to 82.57%, with an average of 81.39%, the porosity of the movable fluid ranges from 13.91% to 17.98%, with an average of 15.88%, and the T₂ cut-offs is from 1.86 to 4.64 ms, with an average of 3.06 ms. The movable fluid mainly occupy larger pores, while the bound fluid is mainly distributed in smaller pores. The best centrifugal force to the core sample is 1.02 MPa. In the samples No. 4 and No. 7 with poorly developed large pores, the saturation of the movable fluid in larger pores differs greatly from that in smaller pores after four times of centrifugation. As for the sample No. 5 with well developed large pores, increasing centrifugal force can significantly increase the saturation of the movable fluid. And when the centrifugal force is close to 1.02 MPa, which is the optimal centrifugal force, there is almost no difference in the contribution of different pores to the parameters of the movable fluid.

Key words: Junggar basin, Santai oilfield, Toutunhe formation, unconsolidated sandstone, movable fluid, bound fluid, occurrence characteristic, NMR

CLC Number:

TE345

ZHANG Tong. Occurrence Characteristics of Movable Fluids in Unconsolidated Sandstone Reservoir of Toutunhe Formation in Santai Oilfield[J]. Xinjiang Petroleum Geology, 2021, 42(4): 469-474.

Figures/Tables 5

Fig. 1.

Table 1.

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Table 2.

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