基于VTI介质的叠前弹性阻抗反演方法应用——以川西坳陷须家河组致密砂岩裂缝性储层为例

doi:10.13809/j.cnki.cn32-1825/te.2022.02.006

摘要/Abstract

摘要：

四川须家河组致密砂岩裂缝性储层储量丰富,但非均质性较强。重点分析川西坳陷须家河组致密砂岩裂缝性储层的实际情况,针对致密砂岩裂缝性储层呈现非均质的特点,基于岩石物理分析,推导出储层特征参数与各向异性参数之间的映射关系,开展针对致密砂岩储层的各向异性参数弹性阻抗反演流程。基于提出的裂缝参数反演方法,分别进行模型和实际工区数据的反演方法测试。结果表明,该方法具有良好的抗噪性,反演结果与测井值吻合较好,估算的各向异性参数能够较好地反映裂缝储层位置,能够实现致密砂岩储层裂缝特征的有效描述。

关键词: 致密砂岩, 储层裂缝, 各向异性, 弹性阻抗反演

Abstract:

The tight sandstone reservoirs in Xujiahe Formation in Sichuan are rich in oil and gas, but highly heterogeneous. The tight sandstone fractured reservoirs of Xujiahe Formation in Western Sichuan Depression are characterized by heterogeneity. Combining with the actual situation and based on rock physics analysis, the relationship between reservoir characteristic parameters and anisotropy parameters is deduced, and the anisotropic elastic impedance inversion workflow of tight sandstone reservoirs is carried out. Based on the proposed fracture parameter inversion method, the model and the actual work field data are tested, respectively. The results show that the proposed approach has great robustness, the inversion results are in good agreement with the well-log, and the estimated anisotropy parameters can accurately show the location of fractured reservoirs and achieve effective description of the fracture characteristics of tight sandstone reservoirs.

Key words: tight sandstone, reservoir fracture, anisotropy, elastic impedance inversion

中图分类号:

TE19

韩磊,刘俊州,杨睿,张广智,周游. 基于VTI介质的叠前弹性阻抗反演方法应用——以川西坳陷须家河组致密砂岩裂缝性储层为例[J]. 油气藏评价与开发, 2022, 12(2): 313-319.

HAN Lei,LIU Junzhou,YANG Rui,ZHANG Guangzhi,ZHOU You. Application of pre-stack elastic impedance inversion method based on VTI medium: A case of tight sandstone fractured reservoir in Xujiahe Formation, Western Sichuan Depression[J]. Reservoir Evaluation and Development, 2022, 12(2): 313-319.

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