低孔低渗储层有效厚度确定方法研究——以安塞油田长2储层为例

Abstract

Abstract:

The Chang-2 reservoir of Ansai oilfield has the geological characteristics of low porosity, low permeability, fast change of physical properties and strong vertical and horizontal heterogeneity. Based on the ''four properties'' relation of reservoir, we established the minimum standards of effective thickness by using the core analysis, oil test, production dynamics and logging by the way of histogram method and cross plot method. Then we proposed the different types of interlayer logging quantitative identification chart and the elimination criterion of various interlayer on the basis of the semi-quantification and semi-qualitative analysis by many kinds of logging curves. The minimum values were as follows: the oil-bearing property was to see the grease spots; the lithological property was to see the fine-grained sandstone; the physical property were the porosity was more than or equaled to 11.5 % and the permeability was more than or equaled to 0.63×10 ^-3μm ²; the electrical property were the resistivity was more than or equaled to 13 Ω·m and the acoustic was more than or equaled to 230 μs/m. The main types of interlayer were calcareous interlayer and muddy interlayer. We could identify and eliminate the interlayer by the quantification of curves of natural gamma, acoustic and microelectrode, and the qualitative analysis of the curves of spontaneous potential, RILD, RILM, microsphere resistivity and micronormal.

Key words: low permeability reservoir, effective thickness, cutoff standards, interlayer elimination, Ansai oilfield

CLC Number:

TE122

Xia Wang,Guomin Fu,Aihua Guo, et al. Research on determination of effective thickness for oil reservoirs with low permeability: A case of Chang-2 reservoir of Ansai oilfield[J]. Reservoir Evaluation and Development, 2018, 8(6): 1-6.

Figures/Tables 9

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References 30

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类别	下限标准
电性下限	230 μs/m≤Δt<242 μs/m,RILD≥-0.275Δt+78.65 Ω·m; Δt≥242 μs/m,RILD≥13 Ω·m
物性下限	φ≥11.5 %;K≥0.63×10^-3μm²
含油下限	油迹级
岩性下限	细砂岩级

夹层类型	定量				定性
夹层类型	自然伽马/ API	声波时差/ （μs·m^-1）	微梯度/ （Ω·m）	井径/ cm	自然电位/ mV	深感应/ （Ω·m）	中感应/ （Ω·m）	微球/ （Ω·m）	微电位/ （Ω·m）
泥质夹层	≥90	≥245	≤11.5	≥22	相对高	低值	低值	低值	低值,与ML2无明显幅差
钙质夹层	≤85	≤230	≥20	≤20	低值	高值	高值	高值	高值,与ML2正幅差不明显

Research on determination of effective thickness for oil reservoirs with low permeability: A case of Chang-2 reservoir of Ansai oilfield

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