• 应用地球物理学Ⅱ（海洋、工程、环境、仪器等） •

扩展弹性阻抗在低孔、低渗砂砾岩储层物性预测中的应用

1. 中海石油(中国)有限公司天津分公司渤海石油研究院,天津 300452
• 收稿日期:2018-03-01 修回日期:2018-06-03 出版日期:2018-10-20 发布日期:2019-01-11
• 作者简介:秦德海,男,1988年生,2013年毕业于中国石油大学(北京)获硕士学位,物探工程师,主要从事地球物理解释及储层预测等研究.

Application of extended elastic impedance for physical property prediction of low porosity and low permeability glutenite reservoirs

QIN De-hai(),LI De-yu,CAI Ji-yan,DAI Jian-fang

1. Bohai Oil Research Institute, Tianjin Branch, CNOOC Limited,Tianjin 300452, China
• Received:2018-03-01 Revised:2018-06-03 Online:2018-10-20 Published:2019-01-11

Abstract:

The glutenite reservoirs are one of the important exploration targets in the Bohai A structural area. With the characteristics of near-source and rapid accumulation, the glutenite reservoir is very heterogeneous and its physical property variation is fast, searching the high quality reservoirs which are locally distributed becomes the key issues to be solved for the following exploration. Based on the theory of elastic impedance, a method of physical property prediction based on Gradient Impedance (GI) is introduced in this paper. The core is the angle rotation in the space of conventional Acoustic Impedance (AI) and Gradient Impedance (GI). By calculating the optimal rotation angle and the corresponding elastic impedance, the elastic parameters related to reservoir porosity are got directly.Then the AVO intercept-gradient attributes are transferred to impedance domain by the colored inversion, and the corresponding porosity-sensitive parameter body is obtained. The practical application in the research area shows that the above method can highlight the physical property variations inside the glutenite reservoirs, and also avoids the complexity steps of the conventional physical prediction. The obtained porosity sensitive parameter body fit the real drilling data well, which effectively indicates the distribution of high quality reservoirs, thus providing support for follow exploration evaluation.