塔里木盆地哈拉哈塘地区奥陶系一间房组岩溶储集层地震识别与控制因素*

哈拉哈塘地区位于塔里木盆地北部隆起轮南低凸起奥陶系潜山背斜西翼上,其中奥陶系一间房组碳酸盐岩岩溶储集层具有成因复杂、非均质性强和识别困难等特点。以该地区现有钻井资料、地震解释成果为基础,在现代岩溶研究成果的指导下,利用分时窗提取、断裂属性(Fault Fracture Attribute,FFA)裂缝预测等特色技术,详细刻画了一间房组孔洞、裂缝型储集层空间分布特征。利用地层CT扫描古河道识别、残厚法古地形恢复、基于优化算法的构造识别体断裂精细刻画等特色技术开展了岩溶储集层控制因素分析,指出古地形较高、水系发达、小断裂发育等是一间房组岩溶储集层发育的有利控制因素。面对现有碳酸盐岩岩溶储集层勘探难题,以现代岩溶理论为指导,钻井-地震结合,综合利用多种地震预测技术是开展研究区碳酸盐岩岩溶储集层识别和控制因素分析的重要手段。

Seismic identification and controlling factors on karsted carbonate reservoir for the Yijianfang Formation of Ordovician in Hanikatam area of Tarim Basin

Located on the west monocline of Ordovician buried hill anticline within Lunnan low uplift of the northern uplift,Tarim Basin,the karsted carbonate reservoir of Ordovician Yijianfang Formation of Hanikatam area has many special features like complicated forming factors,strong anisotropy,difficulties on identification,etc.The detailed distribution rules of cave-hole and fracture reservoir of Yijianfang Formation are summarized in this research using special techniques like separated time-window information extraction and Fault Fracture Atttribute(FFA) fracture identification,based on current well-drilling data and seismic interpretation result and guided by research achievement from modern karsted carbonate theories. Using special seismic techniques of stratigraphy CT scanning on palaeochannel,palaeotopography restoration and small fault identification based on Structure Cube volume using optimized mathematics methods,it reveals that the favorite controlling factors on karsted carbonate reservoir development could be high palaeotopography,rich water system and well development of small faults.From the research,it could be concluded that facing on current difficulties on karsted carbonate reservoir exploration,modern karsted carbonate theories,together with well and seismic reflection characteristics and applying all kinds of suitable seismic methods can help to identify different types of karsted carbonate reservoir and carry out effective analysis on controlling factors on such reservoir.