摘要
通过昆北连片二、三维地震资料联合解释,明确了柴达木盆地昆北地区的地质结构,应用地震叠前深度偏移处理、解释技术落实了构造形态和细节,应用陆相层序地层学分析技术获得切16等井区勘探突破,并取得以下认识:①昆北地区呈南北分带、东西分块的构造格局,以一级断层为界划分为北部跃进斜坡—切克凹陷—乌南斜坡带、南部山前凹陷带和中央昆北断阶带三个构造单元;②昆北断层上盘断层走向主要为南北向或北东向、北西向,靠近区域大断层地层较破碎,小断层发育;③发现了切16井路乐河组(E1+2)地层超覆圈闭,其中以湖进体系域的砂砾岩为主要储层段,以最大湖泛面附近厚为20～40m的较稳定泥岩为区域盖层,具有形成地层(岩性)圈闭的良好条件;④利用KL Inversion、Geocyber技术对E1+2的油气检测结果表明,含油主体位置均位于切163井附近,圈定的切16井区有利含油面积为33km2,并在切15井以东发现新目标,有利含油面积为12km2,含油检测结果与钻探结果吻合程度很高。
The geologic structure of Kunbei area of Qaidam Basin is discovered through interpretation of amount of 2D and 3D seismic data.The structural features and details are implemented using pre-stack depth migration and interpretation.Commercial pool are found from Q16 and other wells using sequence stratigraphy.The result indicates that the structural framework of Kunbei area shows north-south zonation and east-west segregation,and three tectonic units including Qiexi slope belt-Qiekelike sag-Wudong slope belt,southern piedmont sag belt and central Kunbei fault-step belt are divided by the first-order faults.The upfaulted block faults of the Kunbei fault with mainly SN or NE or NW strike are more broken nearby the major fault and a large number of small faults around.Stratigraphic overlap trap in Lulehe group(E1+2) of Q16 well zone is found.The glutenite of lake system tract is mainly reservoir section and a more stable mudstone with 20~40m thick nearby the maximum flooding surface is regional cap rock.All of these are conducive to form the strati-lithologic trap.Using hydrocarbon detection technology,it is found that the main oil Lulehe group(E1+2) is located near the Q163 well.Prospective oil-bearing area of Q16 well is 33km2.A 12km2 new oil-bearing area located in the east of Q15 well is found.In short,prospective oil-bearing area by hydrocarbon detection is consistent with drilling results.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2012年第1期157-165,188+200,共9页
Oil Geophysical Prospecting
