运用MDT测井技术准确识别疑难油气层实例

Application of MDT Logging Technology in Accurate Identification of Knotty Oil and Gas Layers

MDT测井技术是对地下流体的测压取样技术,是直接识别地下油气分布的一种有效手段,是独立于电法测井、放射性测井、波场测井、核磁—成像测井之后的一项测井新技术。通过实时测压,建立压力—深度关系剖面,开展压力—深度相关剖析,利用地下岩石孔隙流体密度的差异识别油气层;通过抽吸测试对地下流体实施抽吸取样分析,判断地下储层纵横向渗流特征,确定其性质,预测其产能;通过对地层流体采集常规样品和PVT取样,对其进行常规流体性质分析和高压物性分析。在系统总结4项地质应用成果的基础上,以现场钻井测井应用为实例开展多井油藏研究,判断油层分布和油藏压力系统。

MDT logging technology is a kind of sampling pressure-measuring technology for underground liquid. It is a new logging technology following electric logging, radioactivity logging, wave field logging, nuclear magnetic and imaging logging, which is effectivein direct identification of underground oil/gas distribution. Correlation profile of pressure and depth relation is established on the basisof timely pressure-measurement. Moreover, correlated dissection of pressure and depth is underway based on the application of thedivergence of interstitial fluid density of underground rock for the identification of oil and gas formation. Suction tests are conducted toanalyze the suction samples of underground liquid and identify the seepage characteristics of vertical and horizontal infiltrating fluid inunderground reservoir. They are also applied to identify the properties of underground reservoir and predict its potential. In addition,analysis of normal fluid property and high-pressure physical property of formation fluid is carried out on the basis of the acquisition ofits normal and PVT samples. To sum up the above four geologic application results, research on multiwell reservoir, judgment on oil-layer distribution and reservoir pressure system are conducted on the basis of the field application of well drilling and well logging,which provides broad prospect for exploration.