东海西湖凹陷平北地区断裂发育特征与油气聚集  

Fault development characteristics and hydrocarbon accumulation in Pingbei area of Xihu Sag,East China Sea

作　　者：杨彩虹[1] 曾广东[1] 李上卿[1] 梁若冰[1] 

机构地区：[1]中国石化上海海洋油气分公司,上海200120

出　　处：《石油实验地质》2014年第1期64-69,82,共7页Petroleum Geology & Experiment

基　　金：中国石化油气勘探重大先导项目"中国石化海域探区勘探潜力与区带评价"资助

摘　　要：西湖凹陷平北地区断层发育,圈闭以复杂断块为主,断裂与油气藏关系密切,断层的发育期次、开启与封闭、组合样式,直接影响到油气的运移、聚集和富集程度。平北地区发育了全盛型、早盛型和中盛型3种类型断层,断层的活动时期、断层两盘的岩性配置以及泥岩涂抹等是影响断层封闭性的主要因素。平湖组早盛型断层封闭性最好,平湖组—花港组全盛型断层封闭性相对较差。不同断层组合圈闭的油气富集程度具有明显差别,顺倾向断层组合圈闭油气富集程度最高,反倾向断层组合圈闭油气富集程度相对较低,顺倾向与反倾向断层组合圈闭油气富集程度居于中等,根据以上认识优选目标钻探效果良好。In the Pingbei area of the Xihu Sag in the East China Sea, faults are well-developed, and traps are mainly complex blocks. The generation stage, open/close and combination style of faults directly affect the migra-tion, accumulation and enrichment of oil and gas. The faults in the study area can be classified into 3 types：peak-flourishing, early-flourishing and mid-flourishing. The active period of faults, the lithologic configuration at both sides of the faults and shale smear are the key elements influencing fault sealing. The faults of early-flourish-ing type in the Pinghu Formation boast the best sealing while those of the peak-flourishing type in the Pinghu-Huagang Formations are relatively worse. There are obvious differences in the degree of hydrocarbon accumulation between various combinations of faults. The combinations of cis-dipping faults show the highest degree of hydro-carbon accumulation;the combinations of anti-dipping faults show the lower degree of hydrocarbon accumulation;the combinations of both cis-dipping and anti-dipping faults show the middle level of hydrocarbon accumulation.

关 键 词：断层 封闭性 油气聚集 平北地区 西湖凹陷 东海 

分 类 号：TE122.3[石油与天然气工程—油气勘探]