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在对鄂尔多斯盆地陇东地区三叠系延长组长6-长8油层组沉积相特征、岩相古地理演化研究的基础上,详细研究了长6-长8油层组短期基准面旋回类型及特征,在长6—长8油层组中识别出3种类型的短期基准面旋回的叠加样式:(1)退积型叠加样式(向上“变深”的非对称旋回);(2)进积型叠加样式(向上“变浅”的非对称旋回);(3)退积-加积型叠加样式(向上“变深”复“变浅”的对称旋回)。并深入研究了储层物性变化模式,包括:物性向上变好的模式;物性向上变差的模式;物性均匀变化的模式;上下砂体间物性突变的模式;物性向上变差复变好的模式及物性变化复杂的复合模式。这些模式与短期基准面旋回的叠加样式密切相关,即短期基准面旋回变化控制了储层物性的变化。
Based on the study of sedimentary facies and facies palaeogeographic evolution of Chang 6 reservoir in Yanchang Formation, Triassic Yanchang Formation in Longdong area, Ordos Basin, the short-term basement cycle types and characteristics , Three types of superimposed patterns of short-term base-level cycles are identified in the Chang-Chang-8 reservoir: (1) Retorded stacking patterns (asymmetric cycles up “darker ”); (2) Stacking patterns (asymmetric swirling up “fading”); (3) Retraction-stacking stacking patterns (symmetric swirls up “darker ” complex “lighter”). In-depth study of changes in reservoir physical properties, including: the physical properties of the upward trend; the physical properties of the upward deterioration of the pattern; uniform physical and chemical changes in the pattern of physical changes between the upper and lower sand body; Complex changes in the complex pattern of physical properties. These patterns are closely related to the superposition pattern of short-term base-level cycles. That is, short-term base-level cycle changes control reservoir physical properties.