摘要
断裂及与之伴生的裂缝系统是轮古东奥陶系油气成藏的主控因素。该区发育三级断裂,Ⅰ级断裂为轮南断裂、桑塔木组断裂和轮南63断裂3条深大断裂,形成于晚加里东—早海西期,具有封闭性;Ⅱ级断裂为南北向走滑断裂,形成于晚海西期,为张性断裂;Ⅲ级断裂为早期发育的北东、北西向共轭断裂,发育在南北向Ⅱ级走滑断裂的东、西两侧,形成于早海西期。奥陶系良里塔格组、一间房组和鹰山组油气成藏受Ⅱ、Ⅲ级断裂的控制。断裂控制了油气的运移和分布,油气藏具有多期充注的特征,充注期次与断裂活动一致,油气充注点通常位于断裂的转折点和交叉点,油气分布呈"准层状"且各层"整体含油气"。沿断裂布井是该区在奥陶系获高产的最有效方法。
The fault and the associated network of fracture are the main control elements of hydrocarbon pool-formation in eastern Lungu area,Where Tertiary faults developed.Fault Ⅰ consists of three discordogenic faults of Lunnan,Sangtamu and Lunnan 63,which developed in late Caledonian-early Hercynian,and has sealing process.Glide fault heading for the south and north is Fault Ⅱ,which developed in late Hercynian-Indo Chinese epoch and has tensional process.Adjoint fault heading for northeast and northwest is Fault Ⅲ,which developed amphi east and west of discordogenic fault in early Hercynian.The hydrocarbon pool-formation of Lianglitage Formation,Yijianfang Formation and Yingshan Formation of Ordovician is controlled by Fault Ⅱ and Faults Ⅲ.The fault controls the migration and distribution of oil and gas,the reservoir has the characteristics of multiple infilling,whose stage agrees with the fault movement.Filling point usually lies in the transition and intersection of the fault,oil and gas distribution presents 'quasilaminar' and each layer presents 'entirely hydrocarbon bearing'.Locating wells along the fault is the most valid way to gain high production in Ordovician of this area.
出处
《中国石油勘探》
CAS
2011年第1期15-20,2,共6页
China Petroleum Exploration
基金
国家科技重大专项"塔里木盆地台盆区海相碳酸盐岩油气成藏条件有利区带评价及勘探目标优选研究"(2008ZX05004-004)
关键词
断裂
油气成藏
奥陶系
轮古东
塔里木盆地
fault
hydrocarbon pool-formation
Ordovician
eastern Lungu area
Tarim Basin
