摘要
断层破碎带是由断面附近派生裂缝和断面充填物组成的地质体,在地表露头容易识别,但是在地下油田的鉴别还是一个难题。利用测井信息结合相关地质资料在东辛断块油田尝试了此项研究,在反复的测井曲线对比基础上,利用裂缝发育系数(Fdr)识别出了派生裂缝(Fdr≥0.35)和断面充填物(Fdr<0.35)。通过对永3块和辛109块不同级别断层的研究,发现了4种类型的断层破碎带:①派生裂缝-断面充填物-派生裂缝组成的对称结构断层破碎带;②派生裂缝-断面充填物组成的非对称结构断层破碎带;③结构不完整的断层破碎带,可进一步细分为只有派生裂缝的断层破碎带和只有断面充填物的断层破碎带两种;④结构复杂的断层破碎带。对永3块不同级别断层的断层破碎带结构及展布特征的研究表明,断面充填物、派生裂缝及周围储层具有不同的岩石物性和排替压力,并在讨论断块油田剩余油挖潜问题的基础上,部署了3口水平井。
A shattered fault zone is defined as a geological body composed of fractures derived from fault movement and fragment fillers between two walls of a fault,it can be identified easily from outcrop but difficultly in subsurface.Based on repeated comparisons of well logging and related geological data,the authors identified 4 types of shattered fault zones in the Dongxin Oilfield of the Jiyang Depression,i.e.①the symmetrical shattered fault zone with a configuration of induced fractures-fragment fillers-induced fractures,②the unsymmetrical shattered fault zone with a configuration of induced fractures-fragment fillers,③the incomplete shattered fault zone with either induced fractures or fragment fillers,and ④the complex shattered fault zone without fixed induced fractures or fragment fillers.A key coefficient（Fdr） was used successfully in the identification,namely if Fdr is≥0.35,it is an induced fracture and if Fdr is 0.35,it is a fragment filler.By examining structural and distributional characteristics of shattered fault zones with different sizes in the Yong-3 block,we found that the thickness,petrophysics and displacement pressure of induced fractures and fragment fillers were key factors for the fault sealing property.The distribution of shattered fault zones was then mapped and applied to the allocation of 3 horizontal wells so as to recover the remaining oil in fault blocks.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2012年第1期82-89,共8页
Acta Petrolei Sinica
基金
国家重点基础研究发展规划(973)项目(2011CB201001)
中国石化重点研究项目(P09037)资助
关键词
断层破碎带
派生裂缝
断面充填物
测井识别
断块油田
东辛油田
shattered fault zone
induced fracture
fragment filler
identification with well-logging
fault-block oilfield
Dongxin Oilfield
