摘要
三肇凹陷扶杨油层断裂发育具有规模小、密度大且密集成带的特点，其与油气关系不清楚。为此，利用分形理论研究断裂的复杂程度，并探讨了断裂维数与油气分布的关系。扶杨油层断裂盒式维数和信息维数集中分布在1．5～1．7。维数为断裂面密度、总长度、组合模式及成因机制综合度量参数，走滑成因、部分斜拉扭动成因和伸展成因的断裂密集带维数普遍大于1．65，油气主要分布在维数为1．45～1．55的区域，表明断裂密集带不是主要的富油构造。基于断裂活动规律分析，认为成藏关键时刻明水组末期活动的断裂为油气“倒灌”运移的通道，这些断裂多为断裂密集带的边界断裂，倒灌过程中通道断层的下盘阻力小，是油气主要的分流方向，因此油气主要富集在断裂密集带边界断裂下盘河道砂中。
The faulting in Fuyang reservoir in Sanzhao Sag is featured by small scale, high density and tight distribution, having uncertain relationship with hydrocarbon. Therefore, fractal theory is adopted to analyze the complex faulting and the relationship between dimensionality of faulting and hydrocarbon as well. Box-counting dimension and information dimension of the faulting in Fuyu reservoir are centered in 1.5 - 1.7. Dimension is a comprehen- sive parameter for the measurement of faulted surface density, total faulted length, fault combined pattern, and faulting genetic mechanism. Dimension of concentrated fault belt caused by strike slip, partly by oblique pulling or twist and extension, is generally more than 1.65, while hydrocarbon is mainly distributed in the areas where the di- mension is between 1.45 - 1.55, indicating that concentrated fault belt is not the main oil-rich structure. The analysis on faulting activity rule indicates that the faults that active in critical oil-pool forming period in late Mingshui Group are pathways for downward migration of hydrocarbon. These faults are mostly located in boundary of concen- trated fault belt, with less resistance in footwall for the downward migration of hydrocarbon, becoming the main di- rection for oil and gas diversion, therefore, oil and gas mainly enriched in the channel sand in footwall of boundary fault in concentrated fault belt.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2010年第4期13-17,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
黑龙江省教育厅科学技术研究项目（11551023）资助.
关键词
扶杨油层
断裂
分形
断裂密集带
通道断层
Fuyang reservior, faulting, fractal, concentrated fault belt, pathway fault
