海拉尔油田贝14区块兴Ⅰ组储层的沉积特征

Reservoir depositional characteristics of XⅠgroup in B14 block of Hailar Oilfield

为解决海拉尔油田中特低渗透储量比例大、注水开发矛盾突出的问题,利用岩芯、测井、录井等资料,探讨海拉尔油田贝14区块兴Ⅰ组储层的颜色及岩石类型、构造特征,分析储层的岩相特征,明确储层的沉积环境。利用测井资料建立沉积微相测井相模式,利用地震反演进行井间砂体预测,实现了井震结合沉积微相精细刻画,探究砂体的分布规律。结果表明:贝14区块兴Ⅰ组储层为扇三角洲前缘亚相沉积;微相类型分为水下分流河道、河口坝、席状砂等五种类型;兴Ⅰ组储层的砂体以水下分流河道砂体为主,砂体分布具有明显规律性和方向性,水下分流河道砂体宽度较大,由南东向至北西方向呈枝状展布。该研究可为海拉尔油田进一步的勘探评价提供一定的理论指导。

This paper is directed at addressing the larger proportion of low permeability reserves and the prominent contradiction of water injection in Hailar Oilfield, an attempt to use the material of cores,and well logging data to analyze the lithofacies characteristics of reservoir, rock color and structural characteristics of XⅠ group in the B14 block of Hailar Oilfield and thereby investigate the depositional environment of the reservoir. The study involves establishing sedimentary microfacies model and predicting the sand body among different well using well logging data and seismic inversion; realizing the combination of well seismic and sedimentary microfacies and ultimately revealing the law behind the distribution of sand body. The results demonstrate that the there are five types of microfacies： underwater channel, mouth bar, sheet sand and so on; the main sand type is underwater channel; the distribution of sand body is marked by regularity and directionality ; and underwater distributary channel is of a larger width, distributing from southeast to northwest. This research may provide some theoretical guidance for further exploration and evaluation in Hailar Oilfield.