裂缝性储层渗透率张量定量预测方法  

Quantitative prediction of permeability tensor of fractured reservoirs

作　　者：刘敬寿 戴俊生[1] 邹娟[2] 杨海盟 汪必峰[1] 周巨标[3] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266555 [2]中国石油冀东油田分公司勘探开发研究院,河北唐山063004 [3]中国石化江苏油田分公司安徽采油厂,安徽天长239300

出　　处：《石油与天然气地质》2015年第6期1022-1029,共8页Oil & Gas Geology

基　　金：国家科技重大专项(2011ZX05042-001);中央高校基本科研业务费专项资金资助项目(13CX02033A)

摘　　要：针对裂缝渗透率张量难以准确定量预测的问题,借助于古今岩石力学层产状的变化,预测裂缝的现今产状;以断裂力学中裂缝表面能以及岩石应变能理论为基础,预测现今裂缝的线密度;通过现今应力场数值模拟,计算三向挤压状态下裂缝的开度,进而确定现今裂缝的平行渗透率。利用裂缝的现今产状将静态坐标系与动态坐标系统一到大地坐标系中,建立了多组裂缝渗透率张量的定量预测模型,给出了渗透率主值、主值方向的计算公式,并且通过调整动态坐标系旋转角预测单元体内不同方向的渗透率。定义了表征渗透率各向异性的3个参数:裂缝渗透率极差比、渗透率突进系数和渗透率变异系数,定量评价裂缝渗透率的非均质性。以铜城断裂带东翼阜宁组二段储层为例,进行了裂缝渗透率张量预测工作。Aiming at difficulties to quantitatively predict fracture permeability tensor,present fracture occurrence was predicted based on occurrence change of rock mechanical layers. Present liner density of fracture was predicted based on the facture surface energy theory and the rock strain energy theory of fracture mechanics. According to the results of present stress field numerical simulation,fracture opening was calculated in three direction extrusion stress state and then present facture parallel permeability was determined. By using present fracture attitudes,static and dynamic coordinate systems were unified into geodetic coordinate system,a quantitative prediction model of multi-group fracture permeability tensors was constructed,formula for calculating the principal value of permeability and main value direction were given,and permeability at different directions in unit body was predicted by adjusting the dynamic coordinate system rotation angle.Three parameters,the ratio of the maximum and minimum value of the permeability,heterogeneity coefficient of permeability and variation coefficient of permeability,were defined to quantitatively evaluate fracture permeability heterogeneity.Fu-2 Member fractured reservoir in the eastern flank of Tongcheng fault belt was taken as an example to predict fracture permeability tensor.

关 键 词：渗透率张量 渗透率各向异性 定量预测 裂缝 铜城断裂带 

分 类 号：TE122.2[石油与天然气工程—油气勘探]