松辽盆地深部地震剖面解释与深部地质研究  

STUDIES OF DEEP GEOLOGY WITH SEISMIC SECTION INTERPRETATION IN SONGLIAO BASIN

作　　者：杨光[1] 薛林福[1] 刘振彪[2] 刘金平[2] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]大庆石油管理局物探公司研究所,黑龙江大庆163357

出　　处：《石油与天然气地质》2001年第4期326-330,336,共6页Oil & Gas Geology

摘　　要：通过 6条长 135 4 6km的 15s深部地震剖面的综合解释 ,揭示了松辽盆地深部许多重要的地层、侵入体和构造等深部地质特征。深部地震剖面的解释结果表明 ,松辽盆地具有上、下地壳二分结构特征 ,深部地震剖面上二者的界线划在网状反射层的顶面 ;利用深部地震剖面上反射波的振幅强弱、波组连续性和波组外形等识别标志 ,可识别出中、新生界、上古生界、前泥盆系、前寒武系、侵入岩体和基性岩浆底垫等地质体 ;此外还发现在地壳深部存在着特殊地质体———地幔热底劈体 ,这种深部地幔热底劈体在空间分布上与天然气的分布密切相关 ,是进行无机成因天然气选区的重要依据。在深部地震部面上解释的莫霍面隆起区与盆地沉降中心呈偏移镜像关系 ,以及广泛发育的犁式断裂系和拆离带均表明松辽盆地是简单剪切作用的结果。The comprehensive interpretation of 6 deep seismic sections of 1 354.6 km long and 15 s deep has revealed the important geological characteristics of strata,intrusive mass and tectonics in deep Songliao Basin.The interpretation results indicate that Songliao Basin consists of upper curst layer and lower crust layer,the boundary between the two layers is on the top of network of reflecting horizon.According to the amplitude of vibration,wave group continuity and forms of seismic waves reflected on the 6 sections,the Meso Cenozoic,Upper Paleozoic,Predevonian,Precambrian,intrusive mass and the basic magma basement could be identified.Especially the special geological body of igneous rock-the mantle thermal diapir found in deep crust layer bears close relation to gas distribution.It is an important evidence of searching for inorganic natural gas.It has been proved that the deviation mirror image between moho swell and the basin's depressed center,the listric faults and detaching zones developed in the basin are all resulted from simple shear action.

关 键 词：松辽盆地 深部构造 深部地震勘探 韧性剪切带 地幔热底劈体 

分 类 号：P618.130.2[天文地球—矿床学] P631.443[天文地球—地质学]