川西洛带浅层气藏岩电参数模拟研究

应用美国产ARS-300^TM岩石和水电阻率测试系统对川西浅层气藏碎屑岩岩心所做地面和地层条件下的电阻率测试得到,孔隙度指数m的地面值小于1.57,地层值小于1.64(孔隙度大于3.0%);饱和度指数n的地面值小于2.35(Ф=6.26%),地层值小于1.50,而产层值小于1.20;随温度、压力的增加（深度增加）,m值增大,而n值减小,随孔隙度的增加,m值增大,n值减小,随地层水矿化度的增大,m值呈增大的趋势。实测值与阿尔奇所公布的纯砂岩m、n值都为2相差较大。应用实测m、n值对川西地区的遂宁组气藏所做的测井解释结果与气田的测试产量,单井产量具有较高的一致性。

SIMULATION RESEARCH ON THE ROCK-RESISTIVITY PARAMETERS OF SHALLOW GAS RESERVOIR AT LUODAI IN WEST SICHUAN

The laboratory litho electric analysis data are the important bases of log interpretation. By means of testing the resistivities of the clastic rock cores collected from the shallow gas reservoirs in West Sichuan under the surface and underground conditions by applying USA made ARS-300TM rock water resistivity test system, it was concluded that the surface value of porosity exponent (m) was less than 1.57, and its underground value＜1.64 (porosity was more than 3.0%); the surface value of saturation exponent (n) was less than 2.35 (porosity was equal to 6.26%), its underground value＜1.50 and its payzone value ＜1.20; along with the increases in temperature and pressure (increase in burial depth) as well as porosity, the m  value increased but the n value decreased; along with the increase in formation water salinity, the m value showed an increase tendency; and the measured m and n values were much less than 2.0 provided for the pure sandstones by Archi. The results of log interpretation of Suining Formation gas reservoirs in West Sichuan by applying the measured m and n values were highly identical to those of gas production test of gas field.