松辽盆地坳陷期湖底扇沉积特征与分布规律——以英台地区青山口组为例  

Deposition Characteristics and Distribution Pattern of Sublaucustrine Fan in Qingshankou Formation,Songliao Basin

作　　者：张庆石[1,2] 张革[2] 陈彬滔[3] 王革[2] 梁苏娟[3] 刘彩燕[3] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《天然气地球科学》2014年第3期318-325,共8页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2011ZX05007-002);中国石油天然气股份有限公司重大专项"松辽盆地北部致密砂岩油和泥(页)岩油资源潜力及富集规律研究"(编号:2012E-2603-01)联合资助

摘　　要：湖底扇是源内油气藏勘探的重要领域。选取松辽盆地西部坡折带重力流为研究对象,利用岩心、测井和地震资料,对大型坳陷湖盆坡折带背景下湖底扇的形成条件、沉积特征、地震响应和分布规律进行研究。湖盆古地形恢复表明,英台地区为坡折带背景,坡折带是重力流卸载的重要场所,同沉积断裂运动、地震活动、火山喷发为重力流的形成提供了触发机制。湖底扇主要由砂质碎屑流、滑动岩和滑塌岩等块体搬运体组成,浊积岩极为少见。湖底扇具有敏感的地震响应特征,剖面上为透镜状,内部振幅和频率变化较大。湖底扇主要分布在四级旋回的基准面上升期,平面上在扇三角洲前缘外侧连片分布,油气成藏条件优越,是岩性油气藏勘探的有利目标。Sublacustrine fan is an important field for oil ＆ gas exploration within source rock. Based on core, logging, and 3D seismic data, formation condition, sedimentary characteristics, seismic responses, and distribution pattern of sublacustrine fan in west slope break zone of Songliao Basin have been studied. The results of paleotopography reconstruction show that slope break zone is well developed in Yingtai area. Furthermore, slope break zone is an important discharging place for gravity flow sediments. Syndepositional fault movement,earthquake activity,and volcanic eruption are major trigger mechanisms for the formation of gravity flow. Sublacustrine fan is mainly composed of sandy debrite, sandy slide and sandy slump, with rare turbidite. Meanwhile,sublacustrine fan has sensitive seismic response characteristics,which is characterized by lenticular external configuration with varied internal amplitude and frequency in seismic profile. Sublacustrine fan is mainly distributed in the rising stage of forth-order base level cycle in vertical and adjacent to fan delta front in plane. On the whole, sublacustrine fan is characterized by excellent hydrocarbon accumulation condition,which can be a favorable target for lithologic reservoir exploration.

关 键 词：湖底扇 重力流 块体搬运体 浊积岩 松辽盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]