摘要
断裂活动对于油气的运移与聚集至关重要,然而伴随断裂活动形成的大量裂缝对于储集空间的改善,及由此而形成的有利储层的预测却没有引起足够的重视.基于分形几何学的基本理论与方法,对惠民凹陷临南洼陷T6反射层（沙三段中亚段）断裂分形特征进行了定量分析,结合已知油气藏的分布及沉积相特征,探讨了断裂分维值的特征及其与油气储集空间分布之间的联系,并对由于断裂活动形成的有利储层的分布进行了预测.结果表明,研究区断裂构造在0.187 5-1.5 区间内具有良好的自相似性,相关系数大多大于0.970;且分维值越大,断裂发育的复杂程度越高.断裂分维值的变化特征与断裂的发育规律具有相关性,研究区中部洼陷的有利储层主要分布于分维值为1.1-1.4的等值线闭合圈内,南、北两侧有利储层分布于分维值大于1.2的等值线闭合圈内;断裂分维值为0.8-1.4的断裂构造部位是该区油气聚集的优势区,分维值大于1.4的部位是油气运移的区域;结合沉积相特征,预测夏224井区以西、夏53井区以南、街斜201井区以南等是目前油气勘探的有利区带.
Faulting is essential for the migration and accumulation of oil and gas. However,expanding space of reservoir resulted from a number of cracks being formed with faulting and the prediction of favorable reservoir formed have not been paid enough attention. Based on the basic theories and methods of fractal geometry,the fractal fracture characteristics of the seismic reflection layer T6 in Linnan subsag of Huimin sag,Bohai Bay Basin(middle section of the third member of Shahejie Formation)has been analyzed quantitatively. The relationship between fractal dimension values of fracture and the proved oil and gas reservoirs distribution has been discussed and the favorable reservoir space resulted from faulting has been predicted. The results show that the fault structures in the research area within the measurement section of 0.187 5-1.5 km have good self-similarity and the correlation coefficients are generally above 0.970. The larger the value of fractal dimension,the more complex the fault structure. The fractal dimension value correlates with the fracture development. The——favorable reservoir in the middle of the sag distributes within the closed contours ranging from 1.1 to 1.4. The favorable reservoir in the south and the north of the sag distributes within the closed contours above 1.2. The fault structure positions with fractal dimensions between 0.8 and 1.4 in this area are the advantage areas for oil and gas accumulation,and the positions with fractal dimensions above 1.4 are the areas for oil and gas migration. The area,where is west to Well Xia224 and south to Well Xia53 and Well Jiexie201,is predicted to be the favorable crack for hydrocarbon exploration combining with sedimentary features.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2015年第1期52-56,共5页
Petroleum Geology and Recovery Efficiency
基金
山东省自然科学基金项目"济阳坳陷惠民-东营凹陷中央隆起带差异隆升机制研究"(ZR2013DM007)
山东省沉积成矿作用与沉积矿产实验室项目"东营-惠民凹陷中央隆起带剥蚀量恢复及隆升差异研究"(DMSM201005)
关键词
T6反射层
沙三段中亚段
断裂分形特征
分维值
有利储层
临南洼陷
seismic reflection layer T6
fmiddle section of the third member of Shahejie Formation
fractal fracture charac-teristics
dimension value
favorable reservoir
Linnan subsag
