陕甘宁盆地油气产能预测方法探讨

以陕甘宁盆地下古生界碳酸盐岩储层小孔、小溶洞特征为基点,用测井资料建立综合指数法和盖层声波时差异常法进行产能预测。综合指数即电阻率与声波之积,它是储集层含油体积的综合反映。根据综合指数的差异,陕甘宁盆地碳酸盐岩储层产能可划分为5个产能区间,符合率达75%以上。声波时差异常是下伏储层油气丰度的良好指示,声波线偏离正常压实线愈大则产能愈高。据此可划分为4个不同产能区,符合率均高于70%.

RESEARCH INTO FORECASTING METHODS OF OIL AND GAS PRODUCTIVITY IN SHAAN-GAN-NING BASIN

Based on small holes and caves developed in Lower Paleozoic carbonate reservoirs in Shaan-Gan-Ning Basin, two methods such as synthetic index method and acoustic time difference anomaly method were established using well log data so as to forecast oil and gas productivity.The synthetic index method is the product of resistivity and acoustical ways, which could be the synthetic reflection of oil volum in the reservoirs.According to the differences of synthetic indices, the productivity of the reservoirs in the basin could be divided into five productivity areas, and the coincidence rate is more than 75%.The acoustic time difference anomaly could be fine indicator of hydrocarbon abundance of underlying reservoirs.The more the acoustic wave curve deviates from compaction curve, the higher the productivity would be.The study area thus could be divided into four productivity zones, and the coincidence rate is greater than 70%.