萨中开发区萨二油层河间砂体细化表征方法

Fine characterization method for interchannel sandbody in S-Ⅱ layer of Sazhong Oilfield

为了提高萨中开发区萨二油层组河间砂储层的动用程度,需要从成因角度精细描述河间砂体类型。依据取心井资料和野外露头剖面,结合开发生产的需要对河间砂体进行了分类,建立了河间砂体三维空间分布模式;利用与邻井河道砂体匹配关系及平面组合关系,制定了表征河间砂体的主要参数及分类标准。与邻井河道相比,天然堤层位偏上,单砂体厚度一般小于1.5 m,有效厚度大于0.2 m;决口水道位于层位中下部,单砂体厚度较大,有效厚度一般大于0.5 m;河漫滩和决口席状砂可根据平面组合加以区分。基于细化表征方法建立了河间砂的自动识别技术和程序,提高了识别精度和效率。

In order to improve the producing degree of interchannel sandbodies in S-Ⅱlayer of Sazhong Oilfield,it is necessary to elaborate types of the interchannel sandbodies from the genetic point of view.Based on coring data and profile of field outcrop,combined with the requirements of development and production,the interchannel sandbodies were classified,and the 3D spatial distribution pattern of the interchannel sandbodies was established.Using the matching relationship with channel sandbodies in adjacent wells,as well as the plane combination relationship,the main parameters and classification criteria were formulated for characterizing the interchannel sandbody.Compared with the channel in adjacent wells,natural levee is in the upper part,where single sandbody has generally a thickness of less than 1.5 m and an effective thickness of greater than 0.2 m.The crevasse channel is in the middle-lower part,where single sandbody has greater thickness,and generally an effective thickness of greater than 0.5 m.The floodplain and crevasse sheet sandbody can be distinguished according to plane combination.The technology and program of automatic identification for interchannel sandbody is established based on the fine characterization method,which improves the accuracy and efficiency of identification.