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

HAN Lei; LIU Junzhou; YANG Rui; ZHANG Guangzhi; ZHOU You

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

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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
Issue 2, Pages: 313-319+328(2022)
Published：2022
DOI： 10.13809/j.cnki.cn32-1825/te.2022.02.006
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DOI：

HAN Lei, LIU Junzhou, YANG Rui, et al. 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]. Petroleum Reservoir Evaluation and Development, 2022, (2): 313-319+328. DOI： 10.13809/j.cnki.cn32-1825/te.2022.02.006.

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。

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.