柴达木盆地北缘红山地区下白垩统碎屑岩沉积相特征
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摘要
在露头、钻井、地震资料综合分析的基础上,运用层序地层学理论,对柴达木盆地北缘红山地区下白垩统进行了层序划分,识别出了2个中期层序(MSC1、MSC2),在层序划分的基础上进行详细的沉积相分析认为,在红山构造带,MSC1主要发育辫状河三角洲前缘水下分流河道,MSC2主要发育辫状河三角洲前缘砂坝;在红山凹陷,2个中期层序均主要发育辫状河三角洲平原相。在2个中期层序中,上升半旋回底部和下降半旋回顶部为有利储集岩发育部位,最大湖泛期密集段泥岩可作为本区的盖层。同时指出油砂沟—红山参2井—东沟、科木尔、红山参1井以南一带为有利油气储集区带,为下一步的深入勘探提供了建议。
Based on ourcrop,drilling and seismic data analysis,the sequence of lower Cretaceous in Hongshan area in the north edge of Qaidam Basin has been divided,thus recognized 2 medium stage sequences(MSC1,MSC2).Detail analysis of sedimentary facies based on sequence division indicates that,in Hongshan structural belt,subaqueous distributary channel of braided channel delta front was mainly developed in MSC1,and braided channel delta front bar was mainly developed in MSC2;in Hongshan depression,braided channel delta front plain was developed in both sequences.In both of the medium stage sequences,the bottom of the rising hemicycle and the top of the falling hemicycle are favorable locations of reservoir rocks.The dense shale of the largest overflow stage can serve as the caprock of this area.The areas to the south of Youshagou-Well Hongshancan 2 -Donggou,Kemuer,and Well Hongshancan 1 are favorable oil and gas accumulation zone for deep exploration in the future.
Based on ourcrop,drilling and seismic data analysis,the sequence of lower Cretaceous in Hongshan area in the north edge of Qaidam Basin has been divided,thus recognized 2 medium stage sequences(MSC1,MSC2).Detail analysis of sedimentary facies based on sequence division indicates that,in Hongshan structural belt,subaqueous distributary channel of braided channel delta front was mainly developed in MSC1,and braided channel delta front bar was mainly developed in MSC2;in Hongshan depression,braided channel delta front plain was developed in both sequences.In both of the medium stage sequences,the bottom of the rising hemicycle and the top of the falling hemicycle are favorable locations of reservoir rocks.The dense shale of the largest overflow stage can serve as the caprock of this area.The areas to the south of Youshagou-Well Hongshancan 2 -Donggou,Kemuer,and Well Hongshancan 1 are favorable oil and gas accumulation zone for deep exploration in the future.
引文
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[2]胡受权,等.柴达木盆地北缘构造格局及在中新生代的演化[J].新疆石油地质,2001,22(1):13~16.
[3]曹运江,等.柴达木盆地北缘构造型式及油气勘探前景[J].西南石油学院学报,2000,22(3):9~12.
[4]吴因业,等.柴北缘地区层序格架下的沉积特征[J].地学前缘,2005,12(3):195~203.
[5]邓宏文,Cross T A,等.高分辨率层序地层学——原理及应用[M].北京:地质出版社,2002:3~18.
[6]姜在兴.沉积学[M].北京:石油工业出版社,2003:399~402.
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