摘要
用快速准确重力三维正演算法计算白垩系顶面及以上各密度界面的重力异常，采用“剥皮法”从实测重力异常中减去自垩系顶面及以上各密度界面的重力效应后得到剩余异常，由此反演研究区内白垩系底面深度。由于采用快速三维反演算法并顾及地质及航磁异常信息，求得了白垩系厚度，计算出的底板埋深等更为合理、精细，为洞庭地区油气资源基础性研究及评价提供了重要的信息。
Rapid accurate three-dimensional forward calculation was performed to evaluate gravity anomalies of the top of Cretaceous and various density interfaces above this top.With the 'barking method',the gravity effects of the top of Cretaceous and various density interfaces above it were subtracted from the measured gravity anomalies to obtain the residual anomaly,and on such a basis the depth of the bottom of Cretaceous in the study area was calculated through inversion. As rapid three-dimensional inverse algorithm was adopted with a consideration of information on geological and aeromagnetic anomalies, the thickness of Cretaceous was evaluated,and the calculated buried depth of the bottom boundary was more reasonable and precise.These data provide important information for the basic research and appraisal of the oil and gas rosources in Dongting area.
出处
《物探与化探》
CAS
CSCD
1996年第5期393-396,共4页
Geophysical and Geochemical Exploration
关键词
洞庭湖
重力反演
重力勘探
数据解释
Dengting Lake, gravity inversion,bottom boundary of Cretaceous
