摘要：Young's modulus and Poisson's ratio are important for reservoir characterization and rock brittleness prediction in unconventional resource exploration and development. Conventional methods can estimate Young's modulus and Poisson's ratio by indirect calculations and direct inversion using approximate expressions, which have cumulative errors and limited accuracy of the estimated results, especially at large incident angles. In this study, we derived a new form of the Zoeppritz equation and P-to-P wave reflection coefficient in terms of density and Young's modulus, Poisson's ratio. It has the same accuracy as the original Zoeppritz equation over a wide range of incident angles. A robust non-linear inversion method based on the iteratively regularized Levenberg Marquardt (IRLM) algorithm, is used to invert all three parameters based on the new equation directly and simultaneously. Synthetic data and field data are used to test and verify the proposed direct inversion method, ensuring the feasibility and effectiveness of the proposed method and the high accuracy and stability of the inversion results. This study has a great potential and valuable guidance for "sweet spot" evaluation and subsequent horizontal well deployment and hydraulic fracturing.

关键字：Young's modulus; Poisson's ratio; sweet spot; Zoeppritz equation; pre-stack inversion; shale

ISSN号：2296-6463

卷、期、页：卷11

发表日期：2023-04-03

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,地学领域高质量科技期刊分级目录（国外T2）,SCIE（科学引文索引网络版）

发表期刊名称：Frontiers in Earth Science

通讯作者：宋宝山

第一作者：LI XIANG YANG,丁拼搏,陈双全,蔡建超

论文类型：期刊论文

论文概要：宋宝山,LI XIANG YANG,丁拼搏,陈双全,蔡建超，Direct pre-stack inversion of elastic modulus using the exact Zoeppritz equation and the application in shale reservoir，Frontiers in Earth Science，2023，卷11

论文题目：Direct pre-stack inversion of elastic modulus using the exact Zoeppritz equation and the application in shale reservoir