曲率法在库车坳陷克深气田储层裂缝预测中的应用

Reservoir fracture prediction of Keshen gasfield in Kuqa Depression using principal curvature method

针对克深气田储层厚度横向分布稳定、构造形态简单且断层发育较少的实际情况,利用曲率法对该气田的储层裂缝分布进行了预测,并将预测结果与数值模拟法的结果对比、结合,对克深气田的储层裂缝有利发育区及有利勘探方向进行了分析。结果表明,利用曲率法预测的裂缝分布趋势与数值模拟法结果基本一致,储层裂缝孔隙度值在构造高点及背斜长轴方向的转折端处出现高值,其中东部背斜高点处裂缝孔隙度最大,其次为西部背斜高点、中部小型背斜高点及东南缘单斜带。从气藏开发的角度指出西部背斜高点及东部背斜高点为最有利勘探方向,中部小型背斜高点为次有利勘探方向,东南缘单斜带所属的圈闭幅度低且面积较小,储量受到限制,勘探价值有限。

According to the fact that the reservoir of Keshen gasfield is of stable thickness,simple structural form and less faults, the fracture distribution in the reservoir is predicted by using principal curvature method,and the prediction result is compared and combined with the result obtained by numerical simulation to analyze the favorable fracture development areas and favorable hydrocarbon exploration areas. The results show that the fracture distribution trend predicted by two methods is basically consistent,and that the reservoir fracture porosity has high value at structural highs and the long axis hinge zones of anticlines,the highest porosity value appears in the highs of the eastern anticline,and the reservoir fracture porosity in the highs of the western anticline,the central small anticline and the southeastern homocline zone is lower. It is pointed out that the highs of the western and the eastern anticlines are the most favorable gas exploration areas,the highs of the central small anticline is secondary,and the highs of the southeastern homocline zone is lower. It is pointed out that the highs of the western and the eastern anticlines are the most favorable gas exploitation areas,the highs of the central small anticline is secondary,and the exploration value of the highs of the southeastern homocline zone is limited,because the zone belongs to low trap range and small area,thus its natural gas reserves would be restricted.