基于水平井测井曲线校直的微相识别技术在肇州油田薄油层砂体刻画中的应用  

Characterization method for thin reservoir sandbodies based on horizontal well logs correction and microfacies identification

作　　者：刘性全 LIU Xingquan(International Exploration and Development Company of PetroChina Daqing Oilfield Co Ltd,Daqing 163514,China)

机构地区：[1]中国石油大庆油田国际勘探开发公司,黑龙江大庆163514

出　　处：《大庆石油地质与开发》2022年第1期118-125,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司重大科技专项“大庆油田持续有效发展关键技术研究与应用”(2016E-0209)。

摘　　要：肇州油田低渗透油层砂泥薄互层发育、平面砂体相变快,目前没有成熟的水平井储层描述方法。由于水平井井轨与直井存在差异,利用直井测井相模式的砂体刻画方法,不能直接进行水平井微相判别及砂体边界识别,无法满足水平井开发需求。为了解决这个问题,根据水平井钻进方向及与地层接触关系,划分水平段类型;利用水平井轨迹与地层倾角等数据,进行水平井曲线校直;根据水平井岩电关系,建立水平井测井相模式及定量参数微相识别标准,分井段进行水平井判相;利用反演约束岩性建模,三维识别砂体边界,结合砂体预测趋势,直平结合刻画水平井区沉积相带发育特征。通过水平井类型判断、测井曲线校直、分段微相判别及地质建模砂体预测4种薄油层砂体刻画方法,识别了该油田水平井5种沉积微相,明确了水平井区砂体展布走向。最后,应用加密井测井资料验证砂体刻画结果。该方法可以准确、快捷地进行水平井微相识别及砂体刻画,为水平井区措施挖潜提供了地质依据。Zhaozhou Oilfield is low permeability oil layer with thin sand-mud interlayers developed,and with rapid areal sandbodies facies change.Currently,there is no mature horizontal well reservoir characterization method.Due to difference between horizontal well and vertical well trajectories,using sandbody characterization method based on vertical well logging facies patterns cannot directly identify microfacies or identify sandbodies boundary of horizontal well,and cannot meet the needs of horizontal well development.In order to solve this problem,horizontal section types are divided according to drilling orientation of horizontal well and contact relationship with strata,and horizontal well log correction is carried out according to data such as horizontal well trajectory and strata dip.Horizontal well logging facies patterns and quantitative parameters microfacies identification criteria are established according to lithologic-electrical property relationship of horizontal well to conduct horizontal well facies identification by separate well sections.Inversion constraint lithologic modeling is used for 3D identification of sandbodies boundary,and combining with sandbodies prediction trend,to characterize the development characteristics of sedimentary facies belts in horizontal well area by vertical and horizontal wells combination.Through horizontal well type judgement,logging curve straightening,segmented microfacies judgement and geological modeling sand body prediction the above 4 kinds of thin oil layer sand body characterization methods,the 5 sedimentary microfacies of horizontal well in this oilfield are identified,and the extension trend of sandbodies in horizontal well is defined.Finally,sandbodies characterization results are verified by infilling wells logging data.The results show that this method can accurately and conveniently identify microfacies of horizontal well and characterize sandbodies,and provide geological basis for tapping the potential of horizontal well stimulation.

关 键 词：薄油层 水平井 微相识别 岩性建模 砂体刻画 

分 类 号：TE122[石油与天然气工程—油气勘探] P631[天文地球—地质矿产勘探]