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引起重力异常的地质因素非常复杂,要对其做出合理地质解释,不仅需要精细分离重力异常,而且需要与其他资料结合。从重力正演模拟出发,分析了可能产生重力异常的地质因素,以及不同地质体的重力响应形态。在此基础上,利用垂向二阶导数及其他信息增强技术,有效提取东营凹陷南部地区局部重力异常,结合地震、钻井资料,进行了地质成因推断分析,认为影响该区重力局部正异常的地质因素主要是古潜山(包括断块山和残丘山)、盖层构造以及其他如陡坡带砂砾岩体等,古潜山的分布多受大断裂控制,平面上成带连片分布;而区域重力异常则反映了该区的区域构造特征。应用效果表明,在地震成熟勘探区,高精度重力不仅可以发现一些新的地质目标,而且与地震相结合,在诸如深层构造、潜山、有规模的隐蔽性断裂等目标的落实方面,也可以发挥积极作用。
Geological factors that cause gravity anomalies are very complicated. To make a reasonable geologic interpretation of them, not only fine gravity anomalies need to be separated, but also need to be combined with other data. Starting from the gravity forward simulation, the geological factors that may produce gravity anomalies and the gravity response forms of different geological bodies are analyzed. On this basis, using the vertical second derivative and other information enhancement techniques, the local gravity anomalies in the southern part of Dongying Sag are effectively extracted. Based on the seismic and drilling data, the geologic genesis inferred is analyzed, and the geological anomalies affecting the local gravity are considered The main factors are ancient burial hills (including fault block mountains and residual hills), caprock structures and other such as steep slope with glutenite bodies, buried hill faults are mostly controlled by large faults, the plane into a contiguous distribution; and the region Gravity anomalies reflect the regional tectonic features of the area. The application results show that in the mature exploration area, high-precision gravity not only can find some new geological targets, but also combined with the earthquakes. It can also be used in the implementation of such targets as deep structure, buried hills and large-scale concealed faults Play an active role.