青格里底山区块断裂与火成岩重磁异常特征研究

青格里底山区块广泛分布的火成岩对地震信号有较强的屏蔽和吸收使用,使石炭系内幕呈空白或杂乱反射。利用该区及邻区岩石、地层物性统计结果,分析了岩石、地层密度与磁化率变化的规律,通过研究区重力、磁力资料精细处理,得到反映断裂与火成岩的重力、磁力异常信息,结合钻井、地震资料,进行了重磁异常的综合解释。研究结果表明,青格里底山区块火成岩的分布与断裂关系密切,区内深大断裂以北西、北东向逆断层为主,这些断裂控制了火成岩的分布。据此推断深大断裂两侧及附近的火成岩是油气成藏的有利场所。

Study on gravity & magnetic anomaly characteristics of fractures and igneous rock in Qinggelidi mountainous exploration block

The igneous rock widely distributed in Qinggelidi mountainous block has strong impact on shielding and absorption seismic signal.The reflection of inner of Carboniferous was blank or messy.According to statistics results of physical properties in this area and its surroundings,we analyze the variation of rock & formation density and magnetic susceptibility.With the fine process of gravity and magnetic data in target area,we get gravity & magnetic anomalies of fracture and igneous rock.Combined with log and seismic data,we did gravity and magnetic anomalies interpretation.The result shows that the distribution of igneous rock in Qinggelidi mountainous block is closely related to the fractures.The deep faults in this area are mainly N-W& N-E reverse faults,which control the distribution of igneous rock.Thus,we inferred that favorable areas of hydrocarbon accumulation are igneous rock distributed at the two sides of deep fault and its nearby area.