伊拉克东南部A油田Asmari组碳酸盐岩储层裂缝测井多分辨率综合评价  

APPLICATION OF MULTI-RESOLUTION COMPREHENSIVE EVALUATION OF FRACTURE LOGGING TO ASMARI FORMATION CARBONATE RESERVOIR IN A OILFIELD,SOUTHEASTERN IRAQ

作　　者：刘永杰 Liu Yongjie(International Company Limited of CNOOC,Beijing 100028,China)

机构地区：[1]中国海洋石油国际有限公司,北京100028

出　　处：《矿物岩石》2022年第2期101-111,共11页Mineralogy and Petrology

基　　金：“十三五”国家科技重大专项课题“中东地区典型厚层碳酸盐岩油藏储层表征研究”(项目编号:2017ZX05032-004-001)。

摘　　要：伊拉克东南部A油田Asmari组碳酸盐岩油藏普遍发育裂缝,储层非均质性强,单井产能差异大、水淹规律复杂,单一测井方法仅反映某一探测范围内的裂缝,不便于综合评价储层裂缝发育规律,因此本次研究引入一套井壁—近井—远井多分辨率裂缝综合识别方法。该方法以远井(井外10 m左右)和近井(井周1 m以内)裂缝识别为主,以井壁裂缝识别为辅。通过横波远探测评价远井裂缝分布和有效性,利用偶极声波地层各向异性分析定量评价近井范围内裂缝发育程度,据井壁电成像测井识别和评价井壁范围内的裂缝发育情况。综合偶极声波和井壁成像测井资料,可以融合不同物理场的信息和技术特点,从而更加有效地对裂缝进行逐级评价。本次研究所提出的裂缝多分辨率综合评价方法在伊拉克东南部A油田确定了研究区平面裂缝发育区,并在裂缝发育区内优化部署了3口水平井,产量是周边同层位水平井的2~3倍,表明该方法可对复杂储层进行有效的裂缝识别。The Asmari Formation carbonate reservoirs in A Oilfield,southeastern Iraq are characterized by strong reservoir heterogeneity,large productivity difference of single well and complex water-out law.Fractures are widely developed in the reservoirs and it is difficult to reveal and comprehensively evaluate the development law of reservoir fractures because single logging method can only reflect fractures in a certain detection range.In this paper,a multi-resolution fracture recognition method for well wall,near borehole and far borehole is introduced,which mainly identifies fractures in the far well(about 10 m out of the well)and near well(within 1 m around the well),supplemented by fractures identification in the well wall.In this method,the distribution and effectiveness of fractures in the far well are assessed by s-wave remote detection,the degree of fracture development in the near well is quantitatively evaluated by dipole acoustic anisotropy analysis,and the fracture development in the well wall is identified by borehole electrical imaging logging.By integrating dipole acoustic and borehole imaging logs,information and technical characteristics of different physical fields can be combined to more effectively evaluate fractures step by step.The proposed method has been applied in A Oilfield in southeastern Iraq.Firstly,the planar fracture zone in the study area is identified,and then three horizontal wells are optimally deployed in the fracture zone.As a result,the drilling verification shows that production is 2-3 times higher than that of the surrounding horizontal wells in the same horizon,indicating this method can effectively identify fractures in complex reservoirs.

关 键 词：碳酸盐岩 裂缝评价 偶极声波测井 远探测 Asmari组 伊拉克 

分 类 号：P618.13[天文地球—矿床学]