摘要
三河次凹戴一段深层以寻找岩性油藏为主,但对于三河次凹戴一段是否受西南部张八岭隆起物源影响存在较大的分歧,进而导致该区沉积、砂体及成藏模式的不明确。为了确定物源方向,利用构造演化分析、岩石矿物组分测定、属性预测及砂地比变化特征多种手段,综合开展了物源方向的分析。结果表明,西南部张八岭隆起物源砂体难以越过东阳次凹在三河次凹沉积,东部物源柳堡低凸起、菱塘桥低凸起提供的砂体延伸较远,可在三河次凹沉积,东部地区的砂体组分和东部物源母岩成分类似,存在东西砂体尖灭边界,砂体物源来自东西两支;戴一段主要受东部柳堡低凸起、菱塘桥低凸起及西部建湖隆起两大物源控制,且东部物源可以向西延伸较远;砂体在内坡带与深凹带逐渐尖灭,在砂体前缘可以形成岩性油藏。
The deep layer of the first member of Dainan formation in Sanhe sub-sag is the target for exploration activity of lithologic reservoirs.However,there are different opinions on the influence of provenance of Zhangbaling uplift in southwest of Sanhe sub-sag,which leads to the uncertainty of deposits,sand bodies and accumulation patterns in this area.In order to determine the provenance direction,the analysis of the provenance direction is carried out comprehensively by means of the structural evolution analysis,determination of rock and mineral composition,attribute prediction and variation characteristics of sand-land ratio.The results show that the southwest Zhangbaling uplift source sand body is difficult to cross the Dongyang sub-sag and deposit in Sanhe sub-sag.The sand body provided by the eastern provenance from Liubao and Lingtangqiao low uplifts extends far and can be deposited in Sanhe sub-sag.The rock mineral composition of the sand bodies in the eastern area is similar to that of the source rock in the east.There is a pinch out boundary between the east and the west sand bodies,and the provenance of sand body comes from the east and west branches.The first member of Dainan formation is mainly controlled by the Liubao-Lingtangqiao low uplifts in the east and Jianhu uplifts in the west,and the provenance in the east can extend far to the west.The sand body gradually pinches out in the inner slope zone and deep sag zone,and lithologic reservoirs can be formed in the front edge of sand bodies.
作者
张星
ZHANG Xing(Exploration&Development Research Institute of Jiangsu Oilfield Company,SINOPEC,Yangzhou,Jiangsu 225000,China)
出处
《石油地质与工程》
CAS
2021年第1期40-46,共7页
Petroleum Geology and Engineering
关键词
三河次凹
戴一段
物源分析
岩石矿物
频谱属性
Sanhe sub-sag
the first member of Dainan formation
provenance analysis
mineral rock
spectral properties
