葡萄花和敖包塔油田葡I组油层低级序断层的地震识别

Seismic identification of lowlevel faults in PuI reservoir of Putaohua and Aobaota Oilfields

(1.中国石油大学(华东)地球资源与信息学院,山东东营257061；2.中国石油化工股份有限公司胜利油田分公司临盘采油厂,山东临邑251507)

大庆葡萄花油田和敖包塔油田葡Ⅰ组油层以窄薄砂体为主,且呈条带状、断续条带状或零星分布,在油田进入开发中后期时,对“窄、薄、散”砂体的展布和储层的非均质性的准确描述,对低级序断层的准确识别和解释,是剩余油挖潜的关键。基于对大庆葡萄花油田和敖包塔油田宏观构造特点和砂体展布总体特征的分析,利用高分辨率地震资料,基于正演模拟结果,综合采取地震剖面解释、沿层相干属性解释和断层综合解释等方法,对6个存在开发问题的低幅度构造断块的葡Ⅰ组油层低级序小断层进行了识别,结合开发动态资料,落实了86条四、五级小断层,为油田剩余油挖潜提供了依据。

Pu I reservoir of Daqing Putaohua and Aobaota oilfield is mainly of narrow and thin sandbodies,with the distribution of ribbon belt,intermittent or scattered.In the mid-late development stages for oilfields,the key for tapping potential residual oil is the accurate description of the distribution of narrow-thin-scattered sandbodies and the heterogeneity of reservoirs,as well as the accurate identification and interpretation of low-level faults.Based on the analysis on the macro structural characteristics and the overall characteristics of sandbodies in Putaohua and Aobaota oilfield,taking the six typical low-relief fault blocks with development problems as example,by using high-resolution seismic data,based on forward modeling,comprehensively applying seismic section interpretation method,along-horizon coherent attributes interpretation method and fault integrative interpretation method,the low-level small faults of PuⅠ reservoir were identified,combined with field production data,86 fourth-level and fifth-level small faults were ascertained,which provides criteria for tapping potential residual oil.
Key words: Putaohua oilfield;Pu I reservoir;low-level fault;forward modeling;coherent attributes along horizon;fault integrative interpretation