地震综合解释技术在构造岩性油气藏勘探中的应用

Application of comprehensive seismic interpretation technology in exploration of structural-lithological reservoir

油气勘探目标常常受构造、岩性等多种地质因素控制，靠单一的地震解释技术很难奏效，迅速发展的地震综合解释技术为构造岩性复合油气藏的勘探提供了有力的技术支持。查干凹陷实现油气勘探突破后，仍然面临着一系列勘探难题。该项研究针对查干凹陷相变快、储集体类型复杂、断裂发育、火成岩分布广泛、构造岩性复合油藏发育等特点，以高精度三维地震资料精细构造解释为主。综合应用相干体地层切片、变速成图、平衡剖面、分频反演、岩性圈闭预测等技术手段，形成了具有特色的地震综合解释技术系列，很好地解决了该区常规地震解释中难以解决的复杂构造断裂系统分布和储层描述问题．取得了明显的勘探效果，对其他类似地质情况的地区具有一定的参考价值。

Oil-gas exploration objects are always controlled by lots of different geological factors such as geological structure and lithology, which can hardly rely on the single seismic interpretation technology. The fast developing comprehensive seismic interpretation technology has offered powerful technical support to the exploration of structural-lithological reservoir. After getting the oil and gas exploration hreakthrough in Chagan Sag, we still faced with a series of difficult exploration problems. Based on the sophisticated structure interpretation of high precision three dimensional seismic data and synthetically applied the techniques of coherent stratal slicing, variable velocity mapping, equilibrium profile, frequency-divided inversion and lithological trap prediction, this research has formed a set of featured and comprehensive seismic interpretation technologies aimed at the characteristics of fast phase transition, the complexity of reservoir type, the fracture development, the wide-spread of igneous rock and the development of the structural-lithological reservoir in Chagan Sag. This technology has commendably solved the problem of complicated structural fracture system distributing and reservoir diseription difficult to deal with in common seismic interpretation in this area, getting obvious exploration effect, which has a reference value for the exploration of other similar areas.