摘要
定边—吴起地区三叠系延长组油源充足,存在由三角洲前缘砂体与分流间湾泥岩组成的大型岩性圈闭,经过多年勘探,已在长8、长6和长3油层组发现了一批油气田。但该区长6油层组的砂体结构及展布规律尚不清楚,从砂体的形成机理方面入手,结合沉积、测井资料,查明该区主要存在4种单砂体类型(箱形、钟形、漏斗形、指状)和3种复合砂体类型,且油藏在漏斗形砂体结构中分布最好;在钟形或指状砂体结构中分布较好;在箱形砂体结构中分布一般。对该区下一步勘探起到一定的指导作用。
Oil sources in Yanchang Formation in Triassic in Dingbian – Wuqi Area are sufficient. There are large-scale lithological traps composed of delta front sand body and distributary channel mudstone. Through years of exploration,a batch of oil and gas fields in Chang-8,-6 and-3 oil layers have been discovered. However,in this area,sand body structures and distribution rules in Chang-6 oil layers are not clear. Starting with the forming mechanism of sand bodies as well as sedimentation and logging data,4 types of single sand body have been identified in this area( box-like,clock-like,funnel-like and finger-like) and 3 types of composite sand body. The distribution pattern of reservoir is the best in funnel-like sand bodies; followed by clock-like and finger-like sand bodies,and then box-like sand bodies. The research on sand body structure will play a guiding role for further exploration in the area.
出处
《特种油气藏》
CAS
CSCD
北大核心
2015年第2期8-12,151,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"(2011ZX05044)
