伪波阻抗反演在永进油田储层描述中的应用

Application of pseudo-wave impedance inversion in reservoir description of Yongjin Oilfield

通过已钻井证实,永进油田虽然具有多层系、多类型复合含油整装的特点,但其勘探目的层埋深大(约为6000m),地震地质条件较差,油气藏储层物性较差且十分复杂,单井产能下降较快,严重制约了永进油田的勘探开发效率。利用伪波阻抗反演技术对该区的储层进行了研究,并与地震属性相结合,预测出了储层发育相对较好的区域。该方法为永进油田的开发、特别是水平井或复杂结构井的设计提供了进一步的依据。

Yongjin oilfield lies at center of Junggar Basin-Changji Sag,north to Chemo paloeohigh. Since 2004,7 wells have been drilled in the area. It is approved by drilled wells that although Yongjin oilfield is characterized by bearing oil and gas in multilayers and composite reservoirs,the buried depth of its bed of interest is deeper(at about 6 000m) and seismic geologic conditions are worse,geophysical property of reservoir is also worse and complex. The single well is decreasing quickly and exploration and development efficiency is restricted seriously. There are urgent questions to be solved to find thicker bearing oil and gas layers and to develop using special drilling techniques. The reservoirs are studied using a pseudo-wave impedance inversion technique and developed well areas are predicted combining with seismic properties. It is predicted 60 km2 at Ⅱsand group of Xisanyao formation,in which the well site is deployed first.