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首页> 外文会议>SPE/ISRM rock mechanics conference (Oil Rock 2002) >Ekofisk Field Well Log Decompaction
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Ekofisk Field Well Log Decompaction

机译：Ekofisk现场测井解井

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The Ekofisk Field is a large oil reservoir located in thernNorwegian sector of the North Sea. About 8.2 meters ofrnseafloor subsidence has occurred above this thick, highrnporosity chalk reservoir since production started in 1971. Thernseafloor subsidence is a result of reservoir compaction in thernchalk, driven primarily by pressure depletion early in the fieldrnlife and water weakening at later stages.rnReservoir compaction monitoring via radioactive markerrnbullets has established a clear association between compactionrnand changes in water saturation and reservoir pressure. Theserndata have also confirmed the mechanical behavior of the chalkrnobserved during laboratory tests. The compaction of highrnporosity chalk is a result of both net effective stress increasesrnlinked to pore pressure depletion and water weakeningrninduced by water injection. Field compaction data from arncompaction monitoring well located in the crestal part of thernfield also suggest a vertical compaction to subsidence ratio ofrn1.20 to 1.25.rnOwing to compaction-related issues, many wells have beenrnredrilled over the life time of the field. The new wells havernyielded new data, such as porosity, water saturation, and layerrnpressure, spanning the entire field production period. Theserndata, however, have been affected by compaction and,rnconsequently, have introduced biases when used as hard datarnto build a geological description of the reservoir. A porosityrnloss of as much as 10 p.u., for example, can be predicted forrnhigh porosity, crestal chalk which has undergone a totalrnreservoir compaction approaching 40 feet over a 30-yearrnproduction life.rnMore than 200 wells have been drilled since 1971 atrnEkofisk, with only 42 of them being considered representativernof the initial geological state of the field. In order to utilize therndata from all 200-plus wells, a software program wasrndeveloped to handle the complex decompaction and forwardrncompaction logic needed to correct the well logs forrncompaction effects. Using the decompaction and forwardrncompaction capabilities of the developed software, data fromrnall 200-plus wells were used to evaluate the total reservoirrncompaction volume and shape. This was, in-turn, compared torn4D seismic-based compaction results as well as compactionrnresults from geomechanical simulations.rnThe developed software and evaluations have made itrnpossible to now build a geological model of the Ekofiskrnreservoir using data from the 200-plus wells drilled on thernfield, each representing the initial state of the reservoir prior tornproduction in 1971. Ultimately, this is expected to improve thernflow simulations of the reservoir leading to better estimates ofrnproduction and reserves.
机译：Ekofisk油田是位于北海挪威海域的一个大型油藏。自1971年开始生产以来，在该厚的高孔隙度白垩储层上方发生了约8.2米的海底沉陷。海底沉陷是the陷区储层压实的结果，主要是由于油田早期的压力枯竭和后期阶段的水减弱所致。通过放射性标记，小球已经建立了压实度与含水饱和度和储层压力变化之间的明确联系。这些数据还证实了在实验室测试中观察到的白垩岩的机械行为。高孔隙度白垩的压实是净有效应力增加（与孔隙压力减少相关）和注水引起的水减弱的结果。来自位于rnfield地壳部分的压实监测井的现场压实数据也表明垂直压实与沉陷比为rn1.20至1.25。由于与压实相关的问题，许多油井在该油田的寿命期内进行了重新钻探。新井收集了整个油田生产期间的新数据，例如孔隙度，水饱和度和地层压力。但是，这些数据受到压实的影响，因此在用作硬数据来构建储层地质描述时引入了偏差。例如，对于高孔隙度的地壳白垩岩，可以预测高达10 pu的孔隙度损失，在30年的开采寿命中经历了总储层压实，接近40英尺。自1971年以来在Erkofisk钻了200多口井，只有42口井其中有代表性的代表了该油田的初始地质状态。为了利用来自所有200多个井的数据，开发了一个软件程序来处理复杂的解压和正压逻辑，以纠正测井结果对压实效果的影响。利用已开发软件的解压和正压功能，可以使用来自200多个井的数据评估储层的总压实体积和形状。反过来，这与基于地震的4D压实结果以及地质力学模拟的压实结果进行了比较。开发的软件和评估结果使得现在有可能使用在恩菲尔德油田钻探的200多口井的数据来建立Ekofiskrn油藏的地质模型。 ，每个代表1971年开采前储层的初始状态。最终，这有望改善储层的渗流模拟，从而更好地估算产量和储量。

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