井震结合内前缘亚相窄小河道砂体刻画方法研究

Methodological Study on Small Channel Sand Body of Inner Front Facies Based on Well-Seismic Integration

针对大庆油田开发中后期油田稳产要求,开采挖潜的主要对象由厚油层转向薄差油层,单纯依靠井资料对薄差储层描述仍存在井间砂体认识不清、井点微相平面组合多解等问题,尤其是井网控制不住的窄小河道在井间的规模、边界、走向等问题上成为薄差油层砂体刻画的一大难题。以萨中开发区北一区断东区块内前缘亚相为例,充分利用大庆长垣油田信息丰富的高密度三维地震资料,在密井网精细合成记录标定及振幅属性切片优选方法的基础上,选取地震信息丰富、沉积特征清晰的高一油层组6+7油层(GⅠ6+7)进行研究,探讨内前缘亚相窄小河道砂体刻画的方法和优势。对GⅠ6+7进行了精细的井震结合储层精细刻画,提高了窄小河道的刻画精度,在油田开发应用中取得了较好的效果。

In allusion to the requirements of production stability,the object of tapping the potential was turned to the thin and poor oil layers from thick reservoirs.The problem of reservoir characterization was discussed only based on well data and non-clarification of sand body and multiplicity for plane combination of well point facies,especially well pattern control could not be effective on the interwell scale,its boundary and trend,it was the problem of sand body depiction in thin and poor reservoirs.By taking inner front facies of the east area of Block B1 of Sazhong Development Zone for example,the high density 3Dseismic data of Daqing Changyuan Oilfield were fully used for reservoir study of GⅠ6+7reservoir,of which its sedimentary features were clear,the method and advantages of sand body depiction of the inner front facies were discussed.A fine reservoir characterization is performed on GⅠ6+7Reservoir by using well-seismic integration,it improves the precision of small channel characterization and it obtains better result of oil development in the oilfield.