新庙西地区构造精细解释及储层预测

Fine structural interpretation and prediction of reservoir in Xinmiaoxi area.

新庙西地区位于松辽盆地南部扶新隆起带北坡,主要储层为砂泥岩薄互层,属三角洲外前缘沉积相带,储层横向变化快,砂泥岩薄互层中砂、泥岩速度差别小,波阻抗反演不能有效地识别砂岩,因此预测砂泥岩薄互层储层难度较大。本文充分利用解释工作站各种功能的优势,从井点出发,根据层位标定的结果,建立连井骨干解释剖面,在全区形成骨干剖面解释网,结合倾角检测、方位角检测、断棱检测、相干数据体技术进行三维地震精细构造解释。采用属性分析、沉积相分析及储层特征曲线重构反演等技术进行储层预测,认为储层特征曲线重构反演在描述储层分布规律及含油单砂体时效果好于常规波阻抗反演。

Xinmiaoxi area is situated in the north slope of Fuxin uplift belt,south Songliao basin,where the main reservoirs are characteristic of thin and interbedded sandstone/mudstone that belong to outer frontal sedimentary facies of delta.The characters of reservoirs are rapid lateral change and minor difference of velocities between sandstone and mudstone in thin and interbedded sandstone/mudstone,which makes prediction of reservoirs of thin and interbedded sandstone/mudstone difficult.Fully using the superiorities of various functions in interpretation workstation,starting from well site and based on horizons-calibrating results,the paper created key well-tie interpretation sections and composed them into interpretation grid in the whole area,then,3-D fine seismic structural interpretation was implemented in combination with tests in dip angles,azimuths and fault edges and with using coherent data volume.Using analyses of attributes and sedimentary facies and reservoir-property-curves-reconstructed inversion to carry out the prediction of reservoir,it considers the reservoir-property-curves-reconstructed inversion has better effects than ordinary wave impedance inversion in describing the distribution law of reservoirs and single oil-bearing sand body.