深部重力对应用重力识别断陷结构的影响  

INTERFERENCES OF DEEP GRAVITY DURING IDENTIFYING FAULT-DEPRESSIONS BY GRAVITY

作　　者：唐金生[1] 李成立[1] 崔瑞华[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2009年第3期139-142,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重点基础研究发展计划（973）项目“火山岩储层及其油气藏识别与评价技术研究”（2009CB219307）.

摘　　要：布格重力异常是由深部及浅部具有密度差异的地质体共同产生的。深部重力场对应用重力研究及识别盆地的断陷结构是一十分重要的干扰因素。深部重力场的存在使得布格重力异常不能很好地反映盆地的总体坳陷特征，因而也就影响了对盆地深部断陷结构的整体规模及形态的客观认识。从松辽盆地的布格重力异常成因人手分析了布格重力异常与断陷结构的关系，指出布格重力异常不能够较好地反映盆地深层的断陷结构，主要是基岩岩性及局部断陷的综合反映，但在布格重力异常中包含十分可靠的反映盆地深层断陷结构的异常信息，通讨采取必要的方法对深部萤力场进行恢复可进一步增强府用萤力识别龠地断陷结构的可靠性。Bouguer gravity anomaly is generated from deep and shallow geologic bodies with density differentials. Deep gravity field is a critical interference factor during identifying fault-depressions with gravity. Since Bouguer gravity anomaly may not reflect depression characteristics due to the existence of deep gravity field, objective understandings on the scale and configuration of deep fault-depressions will be hampered. Herein this article, the genesis of Bouguer gravity anomaly in Songliao Basin has been analyzed and then the relationship between Bouguer gravity anomaly and fault-depressions has been deciphered. Results indicate that Bouguer gravity anomaly may not help to get a clear view of the fault-depression structures in the deeper part of the basin, especially the comprehensive reflection of the lithology of base rock and regional fault-depressions, however, there are still some reliable anomalies in Bouguer gravity anomaly that may reflect the deep fault-depressions and if the deep gravity field can be restored through certain methods, the reliability of identifying deep fault-depressions with gravity can be enhanced.

关 键 词：布格重力异常 深部重力场 断陷结构 相关分析 均衡补偿 影响 

分 类 号：P631.1[天文地球—地质矿产勘探]