柴达木东坪地区下第三系储层特征与控制因素  

Reservoir Characteristics and Controlling Factors in Lower Tertiary of Dongping Area in the Qaidam Basin

作　　者：黄建红[1,2] 张冲[1] 吴颜雄[2] 谭靖儇[3] 李波[2] 

机构地区：[1]成都理工大学,四川成都610059 [2]中油青海油田分公司,甘肃敦煌736200 [3]中油西部钻探工程有限公司,甘肃敦煌7362023

出　　处：《特种油气藏》2013年第6期25-29,142,共5页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"大型油气田及煤层气开发"之"柴达木冲断带油气富集规律;勘探技术与区带和目标优选"(2011ZX05003-006)

摘　　要：受阿尔金断裂及古地形的影响,东坪地区储层预测困难。利用岩心、薄片、分析化验资料和盆缘环境分析,对该区沉积物源、有利相带分布及储层特征、控制因素开展细致研究。结果表明:东坪地区路乐河组有利相带是冲积扇扇中辫状水道、辫状河道、三角洲平原分流河道;下干柴沟组下段有利相带是辫状三角洲平原;下干柴沟组上段有利相带是三角洲前缘和滨浅湖滩坝;路乐河组储层岩性粒度粗,发育次生孔隙,为特低孔、特低渗储层;下干柴沟组储层岩性较细,发育原生孔隙,为中孔、中低渗储层;路乐河组储层物性受杂基含量影响较大,下干柴沟组储层物性受碎屑颗粒的粒径控制较大;压实作用是本区储层物性变差的主要原因,路乐河组比下干柴沟组压实作用强,溶蚀作用对本区储层改善作用明显。Influenced by the Altyn Tagh Fault and ancient landform,it is difficult to forecast and the reservoirs in Dongping area. Using core and thin section data and analysis of basin edge,this paper discusses in detail the sedimentary source,favorable facies belts,reservoir characteristics and controlling factors in this area. The result indicates that favorable facies belts are alluvial fan braided channel,braided river channel and delta plain distributary channel in Lulehe Formation,braided delta plain in lower section of Lower Ganchaigou Formation,and delta front and shore-shallow lake dam in upper section of Lower Ganchaigou Formation. Lulehe Formation is an ultra-low porosity and ultra-low permeability reservoir,with coarse lithology and secondary pores,while Lower Ganchaigou Formation is a medium porosity and medium-low permeability reservoir,with fine lithology and primary pores developed. Reservoir physical property is influenced by the matrix in the Lulehe Formation and the clastic particle size in the Lower Ganchaigou Formation. The compaction,which caused the poor reservoir physical property in this area,is more intense in Lulehe Formation than Lower Ganchaigou Formation. The dissolution effectively improves the reservoir performance in this area.

关 键 词：柴达木盆地 东坪地区 沉积相 储层特征 控制因素 

分 类 号：TE122.2[石油与天然气工程—油气勘探]