应用岩心离子新技术精确识别油水层——以大庆油田SH39井为例

APPLICATION OF CORE ION DETECTION TECHNOLOGY IN ACCURATE IDENTIFICATION OF OIL-WATER BEDS --CASE STUDY ON WELL SH39 OF DADING OILFIELD

油气水层识别是钻探过程的一项重要任务，而对油气水层的准确识别主要依赖于可靠的地层含油气水和岩层物性参数的测量分析。应用岩心离子探测技术可以进一步明确地层含液性质，为油气水层准确识别提供重要依据，由此提出的岩心离子新技术是基于离子探测的地层含水分析方法，针对目标层含油气的标志性离子进行测定，所测对象是岩心或岩屑，再利用岩心离子探测数据计算目标层含水饱和度。在实际应用中，采集了葡萄花油层3个层段的岩心样品进行对比测量，测井解释结果是以产水为主的含油水层；岩心离子新技术的测量结果则是低含水或不含水的产油层，通过试采证实3个层段为工业油层，不产水。由此可见，该方法对油水层识别与实际钻采结果吻合度较高，具备有效的地层含水状况识别能力，能够提高油水层解释判断的精确度。

Oil-gas-water beds identification is a key issue during drilling and the accuracy of which mainly depends on reliable measurements of oil-gas-water contents and property parameters of the layer. Core ion detection technol- ogy will enable the identification of the characteristics of fluid contained in the formation, hence can provide impor- tant information to distinguish oil-gas-water beds. Core ion detection is a new technology based on ion detection for analyzing water contained in the formation. Firstly measure the oil or gas-bearing marker ion in the target beds, the candidates of which are core or debris and then calculate water saturation of the target beds with the measured data. In case study, core samples from 3 intervals of Putaohua reservoir have been selected for measurement and compari- son. Logging interpretation shows that the 3 intervals belong to oil-bearing water zone that mainly produces water,however, core ion detection result shows that the 3 intervals are oil producing zones with low water cut or even water free. Through well testing, the 3 intervals are testified to be pay zones with commercial oil flow and water free, thus it can be concluded that the oil-gas-water beds identification results by the new technology matches well with actual drilling results and this new technology is competent in judging water-bearing status in the formation as well as in promoting the precision of oil and water-bearing layer interpretation.