CO天然气藏岩石电阻声速规律研究

A Study on Acoustic Velocity and Resistivity of Rocks in CO/Natural Gas Accumulation

周家雄 何胜林 陈一健 蔡茂佳 杜祥勇

ZHOUJiaxiong HEShenglin CHENYijian CAIMaojia DUXiangyong

中海石油(中国)有限公司湛江分公司, 广东 湛江 524057 西南石油大学石油与天然气工程学院, 四川 成都 610500 中国石油大港油田勘探事业部, 天津 大港 300280 成都市完井岩电实验技术中心, 四川 成都 610500

Zhanjiang Branch of CNOOC, Zhanjiang, Guangdong 524057, China School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China Dagang Oilfield Exploration Division Department, PetroChina, Dagang, Tianjin 300280, China The Center for Well Completion & Logging Lab, Chengdu, Sichuan 610500, China

海上盆地复杂的地质条件给天然气勘探带来了重重困难，CO天然气藏岩石高温高压下电阻声速实验对天然气勘探开发至关重要。介绍了使用SCMS-E型高温高压岩芯多参数仪在温度最高180℃、孔隙压力最高50 MPa的条件下测试不同比例的CO/天然气混合气体驱替岩样至不同含水饱和度时的电阻率及纵横波速度参数，并测试了干岩样孔隙中充注不同比例的CO/天然气混合气后的纵横波速度变化。实验结果表明，随驱替气体中CO含量的变化，岩样饱和度指数有较小变化，胶结系数几乎不变；干岩样孔隙中充注混合气后，随CO含量的增加，纵波速度有减小趋势。通过Gassmann方程和Batzle经验公式进行流体替换分析，分析结果和测试结果一致。

The complicated geological conditions of sea basins cause difficulties in natural gas exploration. The resistance and acoustic test of rocks of natural gas accumulation under high temperature and high pressure is essential for natural gas exploration and development. This study introduced a test of resistivity and acoustic properties of core samples that were displaced by various proportions of gas/CO mixture at various saturations using an SCMS-E core multi-parameter instrument with various pressures and temperatures and a maximum temperature of 180℃ and a maximum pore pressure of 50 MPa. We also used the instrument to test the change in acoustic velocity of the dry samples that were filled with the gas/CO mixture of various proportions. The experimental results showed that the saturation exponent of the saturated samples changed slightly when the content of CO in the displacing mixture changed, but the cementation factor remained almost unchanged. The longitudinal acoustic velocity of the dry core samples filled with gas/CO mixture decreased with increases in CO content. The change in shear acoustic velocity variation was not obvious when the CO content changed. The test results were consistent with the analysis results by the Gassmann equation and the Batzle empirical equation.

10.11885/j.issn.1674-5086.2015.06.06.25