倾角测井资料在冷湖地区含气储层评价中的应用

Application of dip logging data in gas reservoir evaluation of Lenghu area

柴达木盆地北缘山前带存在着一套以侏罗系煤系烃源岩为主的含气储层,沿着冷湖构造带呈条带状展布,已成为天然气勘探的重要领域。目前,关于冷湖地区气层解释评价研究往往集中在岩性及孔隙结构评价方面,针对含气储层与浅表滑脱断层的关系研究相对匮乏。利用地层倾角资料解释处理,首先对比四类软件进行处理参数优选,然后综合地震剖面及测录井资料,多井对比明确了含气储层与断裂带的关系,研究揭示了含气显示集中段主要分布在滑脱断层带下盘,且距离断点位置越近,具有含气性越好的特征,这一认识有效支持了老井复查挖潜工作并取得实效。

There is a set of gas-bearing reservoirs mainly composed of Jurassic coal-measure source rocks in the piedmont zone of the northern margin of the Qaidam Basin,which are distributed in strips along the Lenghu structural belt and have become an important area of natural gas exploration.At present,researches of gas reservoirs in Lenghu area tend to focus on the evaluation of lithology and pore structure,and the relationship between gas-bearing reservoirs and shallow slip fault is less.Using the interpretation and processing of stratigraphic dip angle data,four types of software are firstly compared for optimal processing parameters.After that,the relationship between gas-bearing reservoirs and the fault zone is defined by the combination of seismic profile and well logging data.The results revealed that the concentrated section gas-bearing of display is mainly distributed in the footwall of the detachment fault zone,and the closer it is to the breakpoint position,the better its gas bearing characteristics,which proves the potential exploration of Lenghu area and has achieved practical results.