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针对不同矿物组分含量对盐膏岩速度影响大,盐膏岩速度复杂难题。本文把岩石物理模版的研究方法引入到盐膏岩的速度研究中,首次建立了盐膏岩四元组分(膏、盐、泥、孔隙地层水)含量与岩石速度关系的模版,在分析盐膏岩组分矿物骨架速度的基础上。基于多矿物测井解释模型,并以纵波模量比与孔隙度趋势作为约束条件,以组分含量为横坐标,岩石速度为纵坐标。在把不同尺度孔隙度值时,泥质、膏、盐矿物含量发生变化时,获得相应盐膏岩速度的变化值放在同一坐标系中,构成了盐膏岩四元矿物组分与岩石速度关系模版。并应用实测岩芯数据和测井数据,验证了该模版的可靠性和适应性,利用该模板能识别盐膏岩中关键结构和重要矿物的变化趋势,能直观的评估盐膏岩矿物组分变化对岩石速度的影响。
According to the fact that the content of different mineral components has a great influence on the velocity of salt gypsum and the velocity of salt gypsum is complex. This paper introduces the research method of rock physics template into the velocity of salt-gypsum rock. For the first time, a template of the relationship between the content of quaternary salt (salt, mud, pore water) and rock velocity is established. The gypsum component is based on the mineral skeleton velocity. Based on the multi-mineral logging interpretation model and using the compressional-compressive modulus ratio and porosity trend as constraints, the compositional content is abscissa and rock velocity is ordinate. When the porosity, porosity and salinities of shale, ointment and salt are changed, the corresponding values of the changes of salt rock velocity on the same coordinate system are obtained, which constitute the relationship between the quaternary mineral composition of salt gypsum rock and the rock velocity Relationship template. The reliability and adaptability of the template are verified by using the measured core data and well logging data. The template can be used to identify the trends of the key structures and important minerals in the salt gypsum rock, and to evaluate the mineral components of the salt gypsum rock Impact of changes on rock velocity.