电缆式地层测压资料在西湖凹陷油气田中的应用

Application of wireline formation pressure measurement data of oil and gas fields in Xihu Sag

随着西湖凹陷油气田勘探开发的不断深入,以“三低”(低电阻率/低对比度、低孔隙度和低渗透率)油气藏为主要特征的复杂油气藏所占比例逐渐增大,电缆式地层测压资料在“三低”油气藏评价中发挥着越来越重要的作用。在收集整理西湖凹陷油气田大量地层测压资料应用实例的基础上,总结了形成研究区超压的影响因素及超压点判断的方法;归纳了研究区电缆式地层测压资料的分类,测压点主要分为5大类:有效点、超压点、干点、致密点、坐封失败点;研究了电缆式地层测压资料的3类具体应用:计算地层流体密度及气油比,根据压力剖面确定流体界面,评价地层渗透率;并提出了新的油气藏气油比评价方法及流度与渗透率的转化关系。电缆式地层测压资料在储层流体性质识别及确定流体界面方面取得了较好的应用效果,对电缆式地层测压资料在西湖凹陷的后续应用具有重要的借鉴意义。

With the exploration and development of oil and gas fields in Xihu Sag,the proportion of complex oil and gas reservoirs characterized by“three low”(low resistivity/low contrast,low porosity and low permeability)is gradually increasing,and wireline formation pressure measurement data plays an increasingly important role in the evaluation of“three low”oil and gas reservoirs.On the basis of collecting and sorting out a large number of application examples of formation pressure measurement data of oil and gas fields in Xihu Sag,the influencing factors of supercharge in the study area and the methods of judging supercharge points were summarized.The classification of wireline formation pressure measurement data in the study area was also summarized,and the pressure measurement points were mainly divided into five categories:effective points,supercharge points,dry points,tight points and setting failure points.Three kinds of application methods of wireline formation pressure measurement data were studied:calculating formation fluid density and gas-oil ratio,determining fluid interface by pressure profile,and evaluating formation permeability.A new evaluation method of gas-oil ratio in oil and gas reservoirs and the transformation relationship between fluidity and permeability were put forward.Among them,the application effect of wireline formation pressure measurement data in reservoir fluid property identification and fluid interface determination is good,which has important reference significance for the follow-up application of wireline formation pressure measurement data in Xihu Sag.