松辽西斜坡超覆带油藏重力异常特征  

Gravitational anomaly feature of reservoir in overlap zone of Songliao west slope.

作　　者：张研[1] 杨辉[2] 文百红[2] 吴小洲[2] 

机构地区：[1]中国科学院广州地球化学研究所 [2]中国石油勘探开发研究院

出　　处：《石油地球物理勘探》2005年第5期591-593,共3页Oil Geophysical Prospecting

摘　　要：松辽西斜坡超覆带油气藏埋藏较浅,一般在300-600m,最浅的油藏埋深只有5-12m。本文在前人有关不同类型油气藏能够引起相对重力负异常的结论基础上,对位于图牧吉地区的普36井钻遇的油砂矿重力资料进行了详细分析,总结出了正向构造背景可以形成区域重力高,而其上的岩性油气藏又可引起局部重力低异常,从而在重力一阶导数异常图上呈现出“隆中凹”的特征。根据“隆中凹”的重力异常特征预测图9井以北该特征也应成为油气指向区,现已得到了地质、自然电位、钻井等资料的初步证实。随后利用这种思路,对该区邻近的江37井区重力资料也进行了类似分析,发现江37井区的重力资料也有“隆中凹”的重力异常特征。The reservoirs in overlap zone of Songliao west slope are characteristic of shallow buried depth that generally is 300-600m and the lowest depth is 5-12m. On the basis of the conclusion studied by the predecessors that different type of reservoirs can produce relative negative gravitational anomaly,the paper studied in detail gravitational data of oil-sand mine drilled in Pu-36 well situated in Tumuji area. It is summarized that positive structural background can produce regional gravitational high and lithologic reservoir in that background also can produce local lower gravitational anomaly, which formed feature of 'sag within uplift' on one-order gravitational derivative anomaly chart. The feature was predicted in the north area of Tu-9 well according to abovemen-tioned analysis, which became oil/gas-predicted zone that has been preliminarily proved by geologic , self-potential and drilling data. Afterwards, using this idea to implement similar analysis for gravitational data in adjacent Jiang-37 well area,which discovered gravitational anomaly feature of 'sag within uplift' in gravitational data of Jiang-37 well area.

关 键 词：松辽西斜坡 重力一阶导数 重力勘探 油气检测 异常特征 相对重力 油藏 覆带 辽西 岩性油气藏 

分 类 号：P315.7[天文地球—地震学] P315.726[天文地球—固体地球物理学]