三台油田头屯河组疏松砂岩油藏可动流体赋存特征

doi:10.7657/XJPG20210411

摘要/Abstract

摘要：

准噶尔盆地三台油田头屯河组疏松砂岩油藏储集层孔隙结构复杂,非均质性强,流体分布差异大。为确定疏松砂岩油藏储集层可动流体赋存特征,通过测试典型岩心样品离心前后的核磁共振T₂谱,定量评价疏松砂岩油藏储集层的T₂截止值及可动流体饱和度。分析结果表明,头屯河组头二段储集层孔隙类型复杂,喉道细小,连通性差;根据T₂谱计算,油藏的可动流体饱和度为80.42%~82.57%,平均为81.39%;可动流体孔隙度为13.91%~17.98%,平均为15.88%;T₂截止值为1.86~4.64 ms,平均为3.06 ms。可动流体主要来自较大孔隙,束缚流体则主要分布于较小孔隙。疏松砂岩岩心样品的最佳离心力为1.02 MPa,较大孔隙发育程度较差的4号和7号样品,4次离心过程中较大孔隙和较小孔隙的可动流体饱和度差异明显;而较大孔隙发育程度较好的5号样品,离心力的增大能够使整体的可动流体饱和度显著上升,在离心力接近1.02 MPa,即最佳离心力时,不同孔隙对于可动流体参数的贡献几乎没有差异。

关键词: 准噶尔盆地, 三台油田, 头屯河组, 疏松砂岩, 可动流体, 束缚流体, 赋存特征, 核磁共振

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

中图分类号:

TE345

章彤. 三台油田头屯河组疏松砂岩油藏可动流体赋存特征[J]. 新疆石油地质, 2021, 42(4): 469-474.

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.

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