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目前YB地区总体钻井事故频发、钻井效率较低,钻井周期较长。该区块部署的开发、评价井比较多,钻井任务重。而欠平衡钻井技术是降低钻井成本,提高钻井效率和缩短钻井周期的重要手段。这就要求掌握YB地区陆相气层的分布规律,明确含气井段及含气有利区域。综合考虑储层的孔隙度、渗透率、含气饱和度及全烃曲线等参数的影响,对储层有利区域进行预测。此方法简单易行,由于岩石储层的孔隙度、渗透率及含气饱和度数值高低能反映储层产气潜力大小,而全烃含量的变化能反映储层中天然气的运移能力和含气性大小,且利用全烃曲线面积计算综合因子正好能屏蔽钻井液和全烃背景值的影响。因此,通过求取综合因子的方法,对该地区储层有利区域分布进行预测是有效的。通过应用验证了这种方法的合理性。
At present, the total drilling accidents in YB area are frequent, the drilling efficiency is low, and the drilling cycle is long. The development of the block deployment, evaluation of more wells, heavy drilling tasks. Underbalanced drilling technology is an important means to reduce drilling costs, improve drilling efficiency and shorten the drilling cycle. This requires grasping the distribution of continental gas layers in the YB region and clarifying the gas well sections and the favorable gas-bearing regions. Considering the influence of reservoir parameters such as porosity, permeability, gas saturation and total hydrocarbon curve, the favorable area of the reservoir is predicted. This method is simple and easy. Since the porosity, permeability and gas saturation of rock reservoirs reflect the potential of gas production in the reservoir, the change of total hydrocarbon content can reflect the transportability of natural gas in the reservoir Gas size, and the use of total hydrocarbon curve area calculation of comprehensive factors can shield the drilling fluid and full hydrocarbon background value. Therefore, it is effective to predict the distribution of favorable area in the reservoir by calculating the comprehensive factor. The rationality of this method is verified through the application.