【摘要】 上奥陶统良里塔格组是塔里木盆地塔中地区重要的储集层。根据已钻井资料,对塔中地区上奥陶统良里塔格组岩石地球物理特征进行了研究,结果表明:物性、储层类型对波阻抗影响最大,岩性、流体对波阻抗影响较小;奥陶系碳酸盐岩致密层和小裂缝型储层具有密度大、速度高、波阻抗值大的特点,利用地震常规预测手段较难预测出小裂缝型储层,而塔中地区奥陶系碳酸盐岩大裂缝型、裂缝—孔洞型、孔洞型、洞穴型储层具有密度小、速度低、波阻抗值小的特点,与围岩具有较为明显的差异,在地震上可以产生明显的响应,可利用常规地震资料来预测这种类型储层。该认识对提高有效预测塔中地区奥陶系碳酸盐岩储层的水平,规避勘探风险,具有一定裨益。更多还原

【Abstract】 Ordovician carbonate rock is the main reservoir in the Tazhong area of Tarim basin. Geophysical characteristics of Ordovician carbonate rock were studied using drilling data. Impedance is affected mostly by material properties and reservoirs types, to a negligibly extent by lithology and flow. Compact layers and minor-fracture reservoirs of Ordovician carbonate rock have characteristics of high density, high velocity and high impedance, and the prediction of minor fractures reservoir is difficult by the general seismic ways. Big fractures and fractured-vuggy and vuggy and cavity reservoirs of Ordovician carbonate rock have characteristics of minor density and low velocity and low impedance in central Tarim basin, which obviously different from the surrounding rock and produce obvious characteristics in seismic data, so reservoirs can be predicted by applying general seismic data. The conclusion provides guidance for predicting carbonate reservoirs and reducing exploration risk.更多还原