重力资料在济阳坳陷石油勘探中的应用

Application of gravity data to petroleum exploration in Jiyang Depression

对济阳坳陷重力资料进行了分析,研究和探索了重力技术在济阳坳陷石油勘探中的应用。利用普测重力资料快速可靠地确定了济阳坳陷构造格架,划分出构造带。利用重力趋势面剩余异常分析与水平导数处理等方法落实了基底断裂系统,确定了断层位置,并对不同尺度重力资料进行了综合分析,分别确定了各级断裂构造。利用连续变化的趋势面分析技术及区域地质资料研究了济阳北部地区的构造变化规律。对各类处理方法得到的重力曲线进行了对比,提出了不同潜山目标的重力资料处理和解释方法,利用垂向二阶导数方法落实了车西洼陷的潜山。利用重力资料精细地落实了埕宁隆起南缘的古冲沟,结合地质资料预测了砂砾岩扇体分布。研究结果表明,随着高分辨率重力技术的不断发展和推广,重力技术在高勘探程度区内仍然可以发挥重要的作用,实现高效低成本勘探的目标。

The gravity data in Jiyang Depression were interpreted. The methods for application of the gravity technique to petroleum exploration were determined. The survey gravity data were used to define the structural pattern and divide the structural zones. The gravity anomaly analysis on trend surface and horizontal derivative processing were used to define the basement fracture system and fault locations. Various fracture structures were defined on the basis of comprehensive analysis of gravity data in the different scale. The regional geological data and the gravity trend surface analysis technique were used to investigate the structural variation in the northern Jiyang Depression. Various gravity curves obtained by different interpretation and processing methods were analyzed. The buried hill of Chexi Sag were defined by vertical second derivative. The buried hill in the south of Chengning Uplift was determined by gravity data. A large number of favorable targets were discovered. It is shown that the gravity analysis technique will still play an important role in high-degree exploration areas with development of high-resolution gravity technique for obtaining the high-efficiency and low-cost exploration targets.