基于Ansys的一种井间低阻体探测方法

A Prospecting Method for Low Resistivity Bodies between Wells Based on Ansys

在能源和矿产资源勘探开发过程中,必须找到地下含水层或含油层,以提供进一步的勘探和开采工作的依据。电阻率是寻找地下含水,含油气通道的重要参数。传统的测井方法是测量井孔围岩的电性参数。不过,找到地下断裂破碎带及含水通道对于整个施工安全及效率都至关重要。因此,迫切需要一种有效探测地下低阻通道的测井方法。在本文中,构造了一个特殊的电测井模型。在一个井中供电,在另外一口井中每个测点测量其响应。利用有限元软件Ansys进行正演计算,并且通过特殊的数据处理方式得到两井间电阻率的分布状态,从而对地下水文地质构造特征进行定性及定量的解释工作。本文中提出的测井模型对探测井间含水通道、破碎带等低阻体有一定的意义;也有利于指导相应的测井仪的设计和测井数据处理方法。

In prospecting and exploitation of energy and mineral resources,it is necessary to find the aquifer or oil containing layer underground so as to provide information for further exploration or exploitation work.Resistivity is an important parameter in prospecting water or oil containing channels.The electrical parameters of rocks around the well are measured in traditional logging methods.However,it is crucial to realize the properties of fracture zone and water containing channel underground for safe and efficient exploitation.Therefore,there is an urgent need for a logging method to explore the lower-resistivity channel underground efficiently.In this paper,a special well-well electrical logging model is constructed.We transmit signals in one well and measure its responses at every survey stations in the other well.The finite element software Ansys is used for forward calculation,then the obtained data are specially proceeded to obtain the electrical parameters of the space during the two wells.Consequently,the obtained information can provide accurate and reliable geophysical basis for qualitative and quantitative explanation of hydro-geological and geological structure characteristics.It has some value of the electrical logging model proposed in this paper on prospecting water or oil contained channels between wells;the model is also helpful to guide corresponding logging tool design and field logging data processing.