陇东地区延长组核磁共振录井解释评价方法研究

Mathod of NMR logging interpretation and evaluation in Yanchang formation, Longdong area

充分利用核磁共振录井获得的可动性参数和物性参数,是提高核磁共振录井解释评价准确性的关键。针对鄂尔多斯盆地陇东地区中生界延长组部分致密储集层核磁共振录井所测含油饱和度偏高,以及现有解释不能充分体现物性好坏的问题,引用反映流体可动性的可动指数和反映储集层孔隙度和渗透率的物性指数两个参数,建立核磁共振录井解释图板。经过最近两年陇东地区的试油资料和实际应用验证,不同流体性质的可动指数和物性指数差异性明显,可动指数与物性指数图板能够准确划分不同流体性质,提高了核磁共振录井在陇东地区中生界延长组解释评价准确性。

Taking full advantage of the movable parameters and physical property parameters obtained by nuclear magnetic resonance( NMR) logging is the key to improve the accuracy of the interpretation and evaluation of NMR logging. In view of the trouble that some tight reservoirs in Mesozoic Yanchang formation,in Longdong area,Ordos Basin have higher oil saturation measured by NMR logging,and the existing interpretation can not adequately reflect the physical property,by referencing two parameters of the movable index that can reflect fluid mobility and physical property index that can reflect the porosity and permeability of the reservoir,NMR logging interpretation chart was established. After the recent two years of oil test data in Longdong area and its practical application verification,the differences between the movable index and the physical property index of different fluids are obvious. The movable index and the physical property index chart can accurately divide the properties of different fluids and improve the interpretation and evaluation accuracy of NMR logging in Mesozoic Yanchang formation,Longdong area.