松辽盆地三肇凹陷姚家组震积岩岩心识别
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摘要
通过岩心观察和描述,结合地质背景研究,在松辽盆地三肇凹陷白垩系姚家组一段识别出震积岩。震积岩主要识别标志有液化砂岩脉、地层破裂构造、震裂缝和微断层、层内褶皱、泄水脉和层理变形、自碎角砾构造及不协调岩块等,并通过对震积标志特征和成因机制的研究,建立了震积岩垂向序列。震积岩的发现对三肇凹陷姚家组油气勘探的意义在于:地震活动可以降低储层孔渗参数、增加油气运移通道;地震引起的断裂可以使三角洲前缘水下分流河道和河口坝砂岩体形成良好的岩性圈闭;地震引起的三角洲前缘滑塌可以使浊积岩发育,为形成岩性油藏创造条件。
Seismite has been identified through core observation and description in conjunction with the study of geological background for the first member of Cretaceous Yaojia formation in Sanzhao depression of Songliao Basin. The identification signs of seismite include liquefacient sandstone dykes,formation breakdown structure,seismic fissure and microfault,intraformational fold,dykes derived from draining and deformed bedding,auto-clastic brecciated structure and discord rock block,etc. A vertical seismite sequence has been defined through the study of the characteristics and genetic mechanism of seismite marks. The discovery of seismite is of great significance to oil and gas exploration in Yaojia formation of Sanzhao depression. Seismic activity can reduce reservoir porosity and permeability and increase the pathways of hydrocarbon migration; the cracks caused by seismic activity can render good lithologic traps in the underwater distributary channels and mouth bar sands of delta front; the slumping of delta front induced by seismic activity may lead to turbidite development,providing conditions for forming lithologic reservoir.
Seismite has been identified through core observation and description in conjunction with the study of geological background for the first member of Cretaceous Yaojia formation in Sanzhao depression of Songliao Basin. The identification signs of seismite include liquefacient sandstone dykes,formation breakdown structure,seismic fissure and microfault,intraformational fold,dykes derived from draining and deformed bedding,auto-clastic brecciated structure and discord rock block,etc. A vertical seismite sequence has been defined through the study of the characteristics and genetic mechanism of seismite marks. The discovery of seismite is of great significance to oil and gas exploration in Yaojia formation of Sanzhao depression. Seismic activity can reduce reservoir porosity and permeability and increase the pathways of hydrocarbon migration; the cracks caused by seismic activity can render good lithologic traps in the underwater distributary channels and mouth bar sands of delta front; the slumping of delta front induced by seismic activity may lead to turbidite development,providing conditions for forming lithologic reservoir.
引文
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[2]杨剑萍,王辉,陈世悦,等.济阳坳陷古近系震积岩特征[J].沉积学报,2004,22(2):281-286.
[3]宋天锐.北京十三陵前寒武纪碳酸盐岩地层中的一套可能的地震-海啸序列[J].科学通报,1988,38(8):609-611.
[4]陈世悦,袁文芳,鄢继华.济阳坳陷早第三纪震积岩的发现及其意义[J].地质科学,2003,38(3):377-386.
[5]袁静.山东惠民凹陷古近纪震积岩特征及其地质意义[J].沉积学报,2004,22(1):41-46.
[6]付文利,王艳琴,杨光,等.东营凹陷沙三段、沙四段震积岩研究[J].油气地质与采收率,2004,11(2):6-8.
[7]杨剑萍,王亚丽,查明,等.山东惠民凹陷古近系湖泊地震涌浪记录的新发现[J].地质学报,2006,80(11):1715-1722.
[8]刘宗堡,马世忠,等.三肇凹陷葡萄花油层高分辨率层序地层划分及沉积特征研究[J].沉积学报,2008,26(3):399-405.
[9]杨玉峰.松辽盆地岩性油藏形成条件与分布规律[J].石油与天然气地质,2004,25(4):393-399.
[10]乔秀夫,宋天锐,高林志,等.碳酸盐岩震动液化地震序列[J].地质学报,1994,68(1):16-34.
[11]乔秀夫,李海兵,高林志.华北地台震旦纪—早古生代地震节律[J].地学前缘,1997,4(3/4):155-160.
[12]Seilacher A.Fault-graded beds interpreted as seismites[J].Sedimentology,1969,13(1/2):155-159.
[13]Seilacher A.Sedimentary structures tentatively attributed to seismic events[J].Marine Geology,1984,55(1):1～12.
[14]杜远生,韩欣.论震积作用和震积岩[J].地球科学进展,2000,15(4):389-394.
[15]梁定益,聂泽同,万晓樵,等.试论震积岩及震积不整合———以川西、滇西地区为例[J].现代地质,1991,5(2):138-146.
[16]周晓东,陈跃军.吉南地区晚震旦世震积岩特征[J].吉林地质,1998,17(4):24-28.
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