Title

Seismic rock physical experiment on the porous fluid replacement at reservoir conditions

单位

1.中国地质科学院地球物理地球化学勘查研究所，河北廊坊065000；2.中国地质大学(北京)地下

信息探测技术与仪器教育部重点实验室，北京100083；3.北京大学地球与空间科学学院，北京

100871

Organization

Pei Fagen, Institute of Geophysical and Geochemical Exploration, China Academy of Sciences, Langfang

065000,China

摘要

针对影响岩石波速的主要因素——不同孔隙流体，展开了储层条件下气-水和油-水互驱地震

岩石物理实验研究。在模拟储层温度、压力条件下，对取自南海的砂岩岩样进行了不同含水饱

和度的气-水和油-水互驱波速测量实验，获得了不同状态下的纵、横波波速，得到了不同气-水

、油-水条件下的弹性参数变化规律。实验表明：①在气-水驱替过程中，纵波速度v_P随着含水

饱和度S_w的增大呈缓慢增长趋势，当含水饱和度达到80%后，v_P增长较快；②在水驱油过程中

，v_P随着含油饱和度的增加而减小，且实验波速值与经典的Biot-Gassmann理论值两者吻合较好

；③气-水驱替过程中，v_P/v_S对不同含水饱和度的孔隙流体反映较为灵敏，通过泊松比σ与体积

模量K交会分析可以较好地分离饱气与饱水岩样；④水驱油过程中，泊松比σ、拉梅常数λ和流体

敏感因子F等参数对不同含水饱和度(含油饱和度)的孔隙流体反映较为敏感，利用λ-F交会图可以

区分饱水和饱油岩样。这些实验结果为利用叠前地震属性进行油气检测提供了有利依据。

Abstract

Different porous fluid is the main factor impacting the acoustic velocity of rock. In terms of this

recognition, we carried out seismic rock physical experiment at reservoir conditions including gas-water

and oil-water replacement. The wave velocity experiment of sand rock samples taken from the South

China Sea in different gas-water and oil-water systems under simulated temperature and pressure

conditions is studied. Some parameters were obtained, including v_P, v_S and the variation law of the elastic

parameters in different gas-water and oil-water conditions. The results indicate:①In the gas-water

replacement experiment, v_P grows slowly along with the Sw increases. When the S_w>80%, v_P grows

faster;②In the oil-water replacement experiment, v_P decreases with the So increases, and the

experimental acoustic velocity coincides with that of classic Biot-Gassmann theory;③In the gas-water

replacement experiment, the v_P/v_S reflects more sensitively to different content of water saturation, both

the gas-saturated samples and water-saturated samples would be separated by the crossplot of K-σ;④In

the oil-water replacement experiment, some parameters including σ, λ and F are more sensitively to the

different content of water saturation (oil saturation),both the oil-saturated samples and water-saturated

samples would be separated by the crossplot of λ-F. These results can be used to detect oil and gas in

prestack seismic attribute analysis.

基金项目

DOI

10.3969/j.issn.1000-1441.2013.06.001