利用横波各向异性评价含煤页岩气储层压裂缝高度——以新场地区须家河组五段为例  

The Application of Shear Wave Anisotropy to Hydraulic Fracture Height Evaluation in Coal-bearing Shale Gas Reservoir A Case Study in the 5th Member of Xujiahe Formation in Xinchang Area

作　　者：吴晓光[1] 李阳兵[1] 章文达 王志文[1] 刘丽珍[1] 姜力[1] 李成荫[1] 

机构地区：[1]中国石油化工股份有限公司西南石油工程有限公司测井分公司,四川成都610100

出　　处：《工程地球物理学报》2017年第4期468-474,共7页Chinese Journal of Engineering Geophysics

摘　　要：对比井筒内压裂前后地层横波各向异性的变化,能够直观、有效地评价及检测压裂缝高度。因此,采用该方法对川西坳陷新场地区须家河组五段含煤页岩气储层压裂缝高度进行了评价,结果显示,岩石脆性矿物含量高、岩石弹性模量高、天然裂缝发育程度高的储层段容易被压裂,压裂缝系统产生的地层横波各向异性更强,同时压裂缝也更容易发生垂向延伸,而脆性弱的煤层、碳质页岩层对压裂缝的垂向延伸具有较强的终止作用。建议在类似地质条件下的储层改造方案中充分考虑煤层及碳质页岩层的发育情况,优选射孔及压裂施工深度段,最大程度地改造储层。The hydraulic fracture height could be effectively evaluated and detected by contrasting shear wave anisotropy change before and after hydraulic fracturing in the well bore.Therefore,through this method,the fracture height in the coal-bearing shale gas reservoir in 5th member of Xujiahe formation in Xinchang area of western Sichuan depression was evaluated successfully.The result showed that the reservoir with higher content of brittle minerals,larger rock elastic modulus and more natural fractures could be fractured more easily;the formation shear wave anisotropy produced by the system of hydraulic fracture would be larger;and meanwhile the vertical extension of fractures would be morelikely to occur.However,the coal and carbonaceous shale with weak brittleness stunted fractures′vertical growth obviously.So we suggest that the features of coal and carbonaceous shale should be taken seriously to optimize perforating and fracturing depth range in the reservoir reconstruction scheme of this similar geological conditions,and in order to maximize the fracturing effect ultimately.

关 键 词：页岩气储层 压裂缝高 横波各向异性 煤 须五段 新场地区 

分 类 号：P631.8[天文地球—地质矿产勘探]