川南DTC构造栖霞组有利储层预测

Favorable Reservoir Prediction on Qixia Formation in DTC Structure of Southern Sichuan Basin

碳酸盐岩气藏在四川盆地天然气勘探中占有重要的位置。但是,有关该盆地栖霞组碳酸盐岩的研究较少。在综合分析测井、地震资料的基础上,通过对研究区储层波形的对比和平面分布的刻画,利用相干属性和叠前各向异性检测对该区的裂缝和溶蚀孔洞进行预测,总结该区储层的发育模式,提出了在溶蚀孔洞发育的斜坡带中,具有中—强变振幅波谷反射特征的区域是最为有利的勘探区域,为栖霞组气藏下一步的勘探提供了理论支持。

The carbonate gas reservoir occupies an important position in gas exploration of the Sichuan Basin. However,there are only a few researches on the Qixia Formation carbonate rock in this basin. In this paper,on the basis of comprehensively analyzing the logging and seismic data,by means of waveform correlation and lateral distribution depiction of reservoirs in the study area,coherent attributes and prestack anisotropy detection were used to predict fractures and dissolved vugsinthe area; the development pattern of reservoirs in this area was summed up,and it was proposed that in the slope zone where dissolved vugs were developed,the areas having moderate- strong variable amplitude trough reflectance signatures were the most favorable exploration regions,which has provided theoretical support for the future exploration of gas reservoir in the Qixia Formation.