一种考虑邻近泥岩特征的油水层识别方法

摘要

Southern Beier depression of Tamuchage basin is one complex faulted basin which has experienced several alterations with many strong tensiles,compressions,settlements and other tectonic activities.The objective reservoir-Nan1 reservoir has no uniform oil-water interface.The reservoir depth varies widely.Because of compaction and diagenesis influence,the logging response characteristics are complex.The oil-water layer resistivity contrast is low.The effect to use traditional oil-water layer identification chart is poor.In order to solve above problems,through researching mudstone logging response characteristics and distribution of oil-water under the stress condition,we found that the mudstone resistivity is more lower,the interval transit time is more bigger,and the oil content of near sandstone reservoir is better,Based on this characteristic,we worked out a new fluid identification method which considers logging response characteristics of adjacent mudstone.It improves fluid identification accuracy of complex reservoir in fault basin.It obtains good geological effect.%塔木察格盆地南贝尔凹陷为多期改造的复式断陷湖盆,经过多次强烈拉张、挤压、沉降等构造活动,目的层南一段储层无统一油水界面,油藏埋藏深度范围变化大,受压实、成岩作用影响,测井响应特征复杂,油水层电阻率对比度低,应用传统油水层识别图版效果不理想.通过对地层应力条件下泥岩测井响应特征与油水分布关系研究,发现泥岩电阻率越低,声波时差越大,则邻近砂岩储层的含油性越好这一特点.基于此,形成了考虑邻近泥岩测井响应特征的一种流体识别新方法,提高了断陷盆地复杂储层流体识别精度,取得了较好的地质效果.