柴达木盆地英东一号油气田成藏机理  

Accumulation mechanism of the Yingdong I field in the Qaidam Basin,NW China

作　　者：孙平[1] 郭泽清[1,2] 刘卫红[1] 张林[1] 田继先[1] 张绍胜[1] 曾旭[1] 

机构地区：[1]中国石油勘探开发研究院廊坊分院 [2]中国石油勘探开发研究院

出　　处：《石油勘探与开发》2013年第4期429-435,共7页Petroleum Exploration and Development

基　　金：国家大型油气田及煤层气开发科技重大专项(2011ZX05007)

摘　　要：柴达木盆地西部英东一号油气田为一埋藏浅、产量高、含油气丰度高的大型油气田,基于对断层输导、封堵机理的分析,研究其成藏模式。该气田断层具有"上封下开"特征:受成岩作用影响,浅层处于早成岩阶段,泥岩处于塑性状态,拉长而不间断形成泥质涂抹,而砂岩则发生碎裂作用,故断层封闭;深层成岩作用较强,泥岩发生脆性断裂,形成大量裂缝,难以形成泥质涂抹,故断层开启。气田成藏模式为:深层断裂输导、浅层断裂封堵、晚期源上成藏,即烃源岩生成的油气沿深部开启断层向上运移,在浅层因断层封堵而成藏。柴西狮子沟—油砂山、开特米里克、盐山和油墩子构造浅层构造形式和成藏模式与英东一号构造类似,是下一步勘探的有利目标。The Yingdong I field is a large oil and gas field of shallow burial depth, high yield and high abundance. Its accumulation model is established by the analysis of the fault opening and sealing mechanisms. Faults in the field have the characteristics of sealing in shallow formations and opening in deep formations. Shallow faults are sealed because shallow formations were still in the stage of weak diagenesis, and tender the influence of diagenesis, shale smear was formed in mudstones which were elongated and uninterrupted, and cataclasis happened in sandstones. On the other hand, deep faults are open because it was difficult for shale smear to form as mudstones in the fault zone had experienced so intense diagenesis that brittle fractures were produced and considerable cracks were formed. The accumulation model can be summarized as follows： deep faults transporting, shallow faults sealing, lower-generation and upper storage and late accumulation, that is to say, when oil and gas migrated along the deep opening faults upward from the source rock, the reservoirs were formed in the shallow layers because of faults sealing. The Shizigou-Youshasha, Kaitemilike,Yanshan and Youdunzi structures have a shallow structure style and accumulation model similar to that of the Yingdong I and are the favorable zones for exploration.

关 键 词：柴达木盆地 英东一号 成岩作用 断层封闭 断层开启 成藏模式 有利目标 

分 类 号：TE122.2[石油与天然气工程—油气勘探]