反演技术在低勘探程度区域岩性油气藏勘探中的应用——以阜东斜坡带中上侏罗统为例

Application of inversion techniques to the exploration of the lithologic reservoirs in the regions with low prospecting degree —taking the middle-upper Jurassic in Fudong slope as an example

如何在低勘探程度的区域进行岩性油气藏的勘探,以准噶尔盆地阜东斜坡中上侏罗统为研究对象,在地震和钻井资料都有限的情况下,综合应用反演技术,进行了岩性圈闭预测,并对所预测的圈闭进行含油气分析.通过研究,提出一条低勘探程度区域岩性油气藏勘探可行性较高的反演技术路线:首先采用以模拟退火技术为核心的反演方法对二维地震剖面进行波阻抗反演,在波阻抗剖面上识别岩性圈闭,然后针对有利岩性圈闭部位的地震测线进行吸收系数反演,利用岩性圈闭的吸收系数特征判断其含油气性,实现岩性油气藏的预测.

It is a problem commonly faced in the exploration of the central or western basins of China how to explore the lithologic reservoirs in the regions with low prospecting degree.Taking the middle——upper Jurassic of Fudong slope in Zhungeer Basin as a research object,the lithologic traps in this area are predicted under finite seismic and well-drilling data by synthetically applying inversion techniques,and the hydrocarbon-bearing potentials of the predicted lithologic traps are analyzed.An inversion course suitable to the prediction of the lithologic traps in the regions with low prospecting degree is put forward:first,the wave impedance inversion of 2D seismic sections is finished by the inversion method whose core is simulated annealing technique;then the lithologic traps are identified on wave impedance sections;finally,the absorption coefficient inversion to the 2D seismic profiles around a favorable lithologic trap is carried out,and the hydrocarbon-bearing potential of the lithologic trap can be judged according to the characters of its absorption coefficient.