摘要：The deep reservoir is usually a type of tight reservoir with high pressure, high stress, low permeability and low porosity. The elastic parameters including Poisson's ratio and Young's modulus are important sensitive parameters to the tight reservoir, and the Gassmann fluid term is frequently used in the field of fluid identification as a highly sensitive fluid factor. Such parameters can be obtained by the common prestack seismic inversion method, but not directly. It must first invert for other elastic parameters and then convert them into the Poisson's ratio, Young's modulus and Gassmann fluid term by some formula. The errors will be accumulated in the conversion step, and the inversion results will have a large deviation. We propose a one-step inversion method to solve this problem. Firstly, a new form of P-wave reflection coefficient equation in terms of Poisson's ratio, Young's modulus and Gassmann fluid term is derived which can directly establish the functional relationship between the P-wave reflection coefficient and these elastic parameters. Considering seismic data of deep reservoir generally have a lower signal-to-noise ratio (S/N) and the partial angle stack gather has a higher S/N than single angle gather, we then derive a stack impedance equation which is suitable for the partial angle stack gather. By using three stacked impedance inversion data with different angle stack ranges, we can directly get the Poisson's ratio, Young's modulus and Gassmann fluid term simultaneously. Model and real data tests both prove that the one-step direct inversion method can reduce the cumulative errors effectively and has higher inversion accuracy.

关键字：Deep reservoir Direct inversion P-wave reflection coefficient equation Stack impedance

ISSN号：1895-6572

卷、期、页：卷: 67 期: 5 页: 1329-1340

发表日期：2019-10-01

期刊分区（SCI为中科院分区）：四区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）,EI（工程索引）

发表期刊名称：ACTA GEOPHYSICA

参与作者：Gui, Jinyong,Gao, Jianhu,Li, Hailiang

通讯作者：李胜军

第一作者：王尚旭

论文类型：期刊论文

论文概要：李胜军,Gui, Jinyong,Gao, Jianhu,王尚旭,Li, Hailiang，Direct inversion for sensitive elastic parameters of deep reservoirs，ACTA GEOPHYSICA，2019，卷: 67 期: 5 页: 1329-1340

论文题目：Direct inversion for sensitive elastic parameters of deep reservoirs