松辽盆地长岭断陷火山岩相地震特征及其响应关系

The seismic reflection characteristics and response relationship of volcanic rocks lithofacies in Changling fault depression,Songliao basin

火山岩储层发育受岩性岩相的控制,为了提高岩性岩相地震识别的精度,选择松辽盆地南部长岭断陷营城组和火石岭组典型钻井火山岩进行井旁地震相分析,分别建立了酸性和中基性火山岩的岩相识别的模版.酸性与中基性火山岩最明显的差别为爆发相和喷溢相之间的差异,酸性岩爆发相具有席状,板状,平行—亚平行反射,连续性好、局部中等,强振幅,低频的特征;酸性岩喷溢相具有楔状、局部透镜,波形反射特征,连续性中—差,中弱振幅、见中强振幅,中高频特征.中基性岩爆发相具有板状,楔状,蠕虫形反射、偶见亚平行反射,中高振幅,中高频,连续性差、见连续性中—好的特征;中基性岩喷溢相具有板状,楔状,平行—亚平行反射、局部波形反射,连续性中等、局部较差,中强振幅,中频、局部高频的特征.根据酸性、中基性火山岩不同的电性特征,结合火山岩段表现的地震内部反射结构,几何形态等地震相特征.总结出不同火山岩之间地震相与测井相的对应关系,为新区识别火山岩相,预测火山岩储层,划分有利储集相带提供依据.

The volcanic reservoir is predominantly controlled by lithology and lithofacies, in order to improve the seismic identification precision of lithology and lithofacies, well-neighboring seismic facies of typical drilling volcanic rocks from the Yingcheng Formation and Huoshiling Formation in the Changling fault depression, the South of the Songliao basin are analysed.. Relevant recognition models for acidic and intermediate--basic volcanics facies are set up. among which there is the most significantly difference ： the former is explosive facies and the latter is effusive facies. The former is characterized by sheet drape, slaty, parallel-subparallel reflection structure, good continuity, strong amplitude and low frequency, whose distribution range is bigger than the latter. The latter is characterized by slatywedge- shaped, parallel-subparaliel reflection structure, partial vermicular reflection structure, middle continuity, middle-strong amplitude and middle frequency, whose distribution is bigger than the former. Based on their distinct features of the electric logging responses, internal seismic reflection structures and geometric shape of the volcanic rocks, the corresponding relation of the differenl connection between seismic facies and logging facies is summed up, which provides a basis for identifing volcanic facies , predicting volcanic reservoirs and dividing favorable reservoir facies belts for a new area.