重力资料在青东凹陷石油勘探中的应用

对青东凹陷重力资料进行了处理解释,研究了布格重力异常和剩余重力异常特征,根据布格重力异常图及其转换图件推测出研究区的断裂体系,利用重力剩余异常图及垂向二阶导数异常图划分出研究区的局部异常,综合重力异常的各种处理图件并依据地质资料确定了研究区的构造单元。研究结果表明,青东凹陷内断裂发育,主要断裂为NE向-NNE向和近EW向,受断裂的控制,凹陷内发育断隆构造。青东凹陷新生界沉积地层厚,认为凹陷中的局部构造为油气运聚的有利指向部位,是预测油气的有利远景区。

Application of Gravity Data to Petroleum Exploration in Qingdong Sag

The gravity data in Qingdong Sag were interpreted.The bouguer gravity anomaly and residual gravity anomaly were studied.According to Bouguer anomaly and it＇s processing maps inferred fault system in the study area,the local anomalies were divided by residual gravity anomaly map and the vertical second derivative anomaly map.Composite various kinds of gravity anomaly maps and geological data were used to determine the structural units in the study area.The results show that the fault structure are highly developed in this area and the main trend is NE-NNE,the uplift is developed by fault.The cenozoic sedimentary formation is thick in Qingdong Sag,the local structure in the study area is the favorable point position for hydrocarbon accumulate and the favorable area for oil and gas exploration.