致密砂岩纵横波速度比影响因素与气水识别  

Influencing Factors of P/S Wave Velocity Ratio and Gas-Water Identification in Tight Sand Reservoir

作　　者：李权 王跃祥 李旭 夏小勇 吴燕辉 高峰[4] LI Quan;WANG Yuexiang;LI Xu;XIA Xiaoyong;WU Yanhui;GAO Feng(Geological Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China;Research Institute of Exploration and Development,PetroChina Southwest Oil and Gasfield Company,Chengdu,Sichuan 610041,China;Daqing Branch,China National Logging Corporation,Daqing,Heilongjiang 163412,China)

机构地区：[1]中国石油集团测井有限公司地质研究院,陕西西安710077 [2]中国石油天然气集团有限公司测井重点实验室,陕西西安710077 [3]中国石油西南油气田分公司勘探开发研究院,四川成都610041 [4]中国石油集团测井有限公司大庆分公司,黑龙江大庆163412

出　　处：《测井技术》2023年第5期569-577,共9页Well Logging Technology

基　　金：中国石油勘探与生产分公司勘探工程技术测井攻关项目“四川盆地川中-川西地区沙溪庙组致密气甜点优选技术”(20210301-23)。

摘　　要：纵横波速度比在致密砂岩含气性评价中起着重要的作用。F含气区侏罗系沙溪庙组沙一段陆续出现产水井,流体性质由原来的单相气变为气水两相,且存在高电阻率水层,现有的纵横波速度比基值法以及电阻率法判断含气性的符合率均不高。通过数值模拟与地层条件下岩心纵横波实验,分析单一纵横波速度比在判断气水关系时的不足,即受岩性、物性和饱和度的耦合影响。针对高电阻率疑难层,结合研究区实验数据提出基于Gassmann方程反演流体体积模量估算饱和度模型,该模型在致密砂岩高电阻率水层的识别中具有一定的效果,在后续电阻率疑难层评价中体现出非电法的优势。Velocity ratio of P/S wave plays an important role in gas-bearing property evaluation of the tight sand.With the emergence of water-producing wells in the study area,the first layer of Jurassic Shaximiao formation of F area,the property of fluid has changed from gas to gas-water,and there are some water zones of high-resistance,which leads to the low coincidence rate of both the basic value method of P/S wave velocity ratio and the resistivity method in judging gas-bearing property.Through numerical simulation and P-wave and S-wave experiments of the cores in formation conditions,the deficiency of the single P/S wave velocity ratio in gas-water identification is discussed,in other words,it is affected by the coupling of lithology,physical properties and saturation.Based on the experimental data,a saturation estimation model of the inversion of fluid bulk modulus based on Gassmann equation is also given.This model has a certain effect in the identification of the water zones of high-resistance in tight sand,and as a non-electrical method it shows the advantages of identifying the fluid property of reservoir with the attribute of difficult resistivity.

关 键 词：致密砂岩 气水识别 纵横波速度比 流体体积模量 

分 类 号：P631.84[天文地球—地质矿产勘探]