后效资料在德惠断陷气层解释中的应用研究

The Application of Aftereffect Logging in Gas Layer Interpretation of Dehui Fault Depression

摘要: 后效录井检测到的烃类异常主要是扩散和渗滤作用产生的。由于不同油气层含油气性和地层压力的差异，其侵入井筒的油气量也不同，后效峰的高低、宽窄、数量也会不同。对于同一钻井液体系，地层压力越大，含油气性越好，后效录井烃类异常值越高。但是要准确区分每一套油气层后效异常的大小，需要对后效资料进行处理和分析，对比多次后效峰的形态，分析后效峰的变化情况，才能确定油气层后效异常的大小，进一步掌握地层纵向上含油气性的差异。结合油气上窜速度、钻井液性能、槽面显示、试井数据等资料，建立区块后效录井解释标准，为油气层解释评价提供更加充分的依据。

Abstract: The hydrocarbon anomalies detected by aftereffect logging were mainly caused by diffusion and infiltration. Because of the difference of hydrocarbon content and formation pressure in different oil and gas reservoirs, the volume of the oil and gas that intruded into wellbore was different, and the maximum, width and quantity of the aftereffect logging peaks were also different. For the same drilling fluid system, the greater the formation pressure was, the better the hydrocarbon content was, and the higher the abnormal hydrocarbon value of the aftereffect logging would be. But to distinguish each set of oil and gas aftereffect logging abnormality, it was necessary to analyze and process the data of aftereffect logging, compare the shapes of aftereffect peaks, analyze the changes of aftereffect peaks, and determine the aftereffect abnormality in the reservoir for the purpose of further understanding the difference of vertical oil and gas in formation. According to the data of oil and gas ascending velocity, drilling fluid performance, drilling fluid tank display and well test data, the aftereffect logging interpretation standard of aftereffect logging in the block is established, which provides more sufficient basis for interpretation and evaluation of oil and gas reservoir.