大庆深层流纹岩全直径岩心实验数据分析

Experimental Data Analysis on Full Diameter Rhyolite Cores from Daqing Deep Layers

对大庆深层流纹岩全直径岩心样品的电、声实验数据进行了深入分析,内容包括实验数据的预处理、测量结果的重复性检验、矿化度对测量结果的影响、最佳-F、-Δt和Sw-I实验关系的确定以及与Archie方程的比较等。这是国内第1次对模拟地层温度压力条件下全直径流纹岩岩心测试结果的分析。通过实验分析精确确定了计算流纹岩孔隙度及含气饱和度的方程;精确外推得到了流纹岩的纵、横波骨架时差,即流纹岩骨架的纵波、横波速度,进而得到了纵横波速度比。该结果为松辽盆地深层天然气勘探提供了最基础的地球物理参数和解释方程,可直接用于大庆深层流纹岩气藏测井资料解释和地震数据处理。

An experimental data analysis on full diameter rhyolite cores from Daqing deep layers is made. The experimental data include both electrical and sonic ones. The analysis we made includes： experimental data pre-processing, repeatability test on measuring results, influence of salinity on measuring results, determination of optimum experimental relations of φ-F,φ-△t and Sw-I, as well as their comparisons with Archie＇s equation. This is the first time in China that the measuring results of full diameter rhyolite cores which were tested under the conditions of simulating real forma- tion temperature and pressure are analyzed. By expreimental data analyses we determined the equations which can accurately calculate the porosity and gas-bearing saturation of rhyolite; determined the P-wave and S-wave slowness of rhyolite matrix, i.e. the P-wave and S-wave velocities of rhyolite matrix, and determined the ratio of P-wave and S-wave velocities as well. These two results provide the basic parameters and equations for the gas exploration in Songliao basin, and they can be used directly in seismic data processing and logging data interpretation of Daqing deep rhyolite gas reservoir.