冀东油田水驱油实验录井资料响应特征及水淹机理分析

开展冀东油田模拟注水驱油实验,以稳态法测定油-水相对渗透率,制备饱和油,低、中、高含水及残余油的不同产水率的岩样,按物性条件分为一、二类储层,对岩样进行岩石热解、饱和烃气相色谱及荧光显微图像分析。一类储层随着含水上升,饱和烃气相色谱峰值逐渐降低,峰型从正态峰型向扁平型变化;二类储层与一类储层峰型变化类似,只是降低幅度不同。总体上两类储层热解含油气总量均随含水上升呈降低趋势,一类储层降低的幅度差大于二类储层,特低孔特低渗储层变化不大。两类储层随着产水率的上升,反映岩石含油丰度的参数饱和烃总面积、Pg值总体上均从未水洗的饱和油到残余油有规律地下降,证明地化参数可以反映产水率的变化。水驱油不同产水率的荧光显微图像特征,证明该技术能够对油层的不同水洗程度进行判别。下一步将根据冀东油田水驱油实验分析资料,利用投产井及密闭取心井分析资料建立解释标准及图版,对开发区块新钻调整井进行解释。

Test Analysis on Water Flooding Response Features of Logging Data and Watered Out Mechanism in Jidong Oilfield

Simulated water flooding test is made in Jidong oilfield.Oil/water relative permeability is tested by stable state method.Samples of saturated oil,low/medium/high water cut and residual oil are prepared.Reser- voirs are classified into two types according to the physical properties.Rock pyrolysis,gas chromatograph of saturated hydrocarbon and fluorescent microscopic image of the samples are analyzed.Gas chromatograph peak of saturated hydrocarbon is decreasing along with the increasing of water cut and changing from normal dis- tribution to flat shape in the first type of reservoirs.Peak change of the second type of reservoirs is similar to the first one with different drop degrees.Generally total pyrolysis yield of hydrocarbons of two types of reservoirs is decreasing with water cut increasing,and the drop degree of the first type of reservoirs is greater than the second type.The reservoirs with extra-low porosity and extra-low permeability change little. Total saturated hydrocarbon area and Pg value both decrease from non water flooded saturated oil to residue oil along with the increase of water yield ratio in two types of reservoirs.It proves that geochemical parame- ters can reflect the change of water yield.Fluorescent microscopic image of various water yield ratio during water flooding proves that this technique can judge degree of water flooding of the reservoirs.According to test data of the water flooding in Jidong oilfield,interpretational criteria and chart will be built through analytical data of brought-in wells and sealing core wells for interpreting new drilled adjustment wells in the development area.