岔路河断陷梁家—新安堡地区低渗储层敏感性影响因素分析及预测

ANALYSIS OF AFFECTING FACTORS AND PREDICATION OF SENSITIVITY FOR LOW PERMEABILITY RESERVOIR:A CASE STUDY OF LIANGJIA-XIN' ANPU DISTRICT IN CHALUHE DEPRESSION

为了准确的认识梁家-新安堡地区储层敏感性的影响因素及建立其预测模型,从实验分析入手,测量不同样品的敏感性及其物性和粘土矿物等参数,结合铸体薄片、压汞、扫描电镜等实验方法,从宏观和微观两个角度,分析储层敏感性与沉积相带、孔隙度、渗透率和各类粘土矿物相对含量之间的关系,以及储层敏感性与储层的孔喉类型、孔隙结构参数、粘土矿物产状和储层岩石的润湿性之间的关系。采用多元回归方法建立了速敏、水敏、酸敏和碱敏的预测模型。结果表明:梁家-新安堡地区储层具有较强的水敏和速敏性,从辫状河道的心滩相到浅湖席状砂相,其五敏性逐渐增强;孔隙度、渗透率、粘土矿物类型和含量是控制该区储层的重要参数;采用多元回归方法建立的敏感性指数预测模型对敏感性程度预测的吻合率达75%。

Experiments were conducted on the sensitivity of different samples of clay minerals, their parameters and their physical property respectively, combined with the analysis data of casting thin sections and SEM, so as to understand the affecting factors and establish the prediction model of sensitivity in Liangjia-Xin＇anpu district. The relations between the reservoir sensitivity and the sedimentary facies, porosity, permeability, relative content of clay minerals, throat types, structural parameters of pore, occurrence of clay minerals and the moisture of reservoir rock, were analyzed. A sensitivity prediction model by using multiple regression methods was established in the aspect of speed sensitivity, water sensitivity, acid sensitivity and alkali sensitivity respectively. It was showed that there were strong water sensitivity and speed sensitivity in the area and the degree of sensitivity was increasing from braid river sediments to lake sediments. The porosity, permeability, contents of different kind of clay minerals were important parameters for reservoir sensitivity in this area, and the predicting results with this model has a 75 percent precision.