济阳坳陷古近系沙河街组震积岩特征及其储集性能
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摘要
通过大量岩心、薄片和成像测井资料分析,在济阳坳陷古近系沙河街组沙四段上部和沙三段地层中识别出震积岩。震积岩的主要标志是发育各种类型的软沉积变形构造,包括液化砂、泥岩脉、液化卷曲变形构造、阶梯状微断层、震积砂枕构造及震积砂球构造、串珠状构造、碳酸盐泥晶脉、自碎角砾状构造及假结核等。震积岩主要发育在古近系沙三段和沙四段上部,表明沙四段-沙三段沉积时期是控盆边界断裂强烈活动的时期。尽管地震作用没有使储集层孔隙度大幅度增加,但能够极大地改善储集层渗透性。震积岩特别是震裂岩和震碎角砾岩是一种潜在的油气储集层。
Based on core observation, thin section and imaging logging analyses, seismite is recognized in the upper part of Member 4 and Member 3 of Shahejie formation of Paleogene in Jiyang depression. Such a rock features soft sediment deformation structures, including liquefied sand and shale veins, liquefied convolute lamination, step microfault, pillow and ball structures, beaded structure, carbonate micrite vein, autoclastic brecciated structure and pseudonodule, etc. Study shows that sedimentary period of Member 4-Member 3 of Shahejie formation is the intense activity period of the basin boundary fault. The obvious effect of seismism on hydrocarbon reservoir quality greatly improves the reservoir permeability whereas the improved porosity is seldom found. It is concluded that Seismite, especially the shattered rock and seismic-clastic breccia are as potential reservoir rocks. This provides new areas for petroleum exploration and development in the near future here.
Based on core observation, thin section and imaging logging analyses, seismite is recognized in the upper part of Member 4 and Member 3 of Shahejie formation of Paleogene in Jiyang depression. Such a rock features soft sediment deformation structures, including liquefied sand and shale veins, liquefied convolute lamination, step microfault, pillow and ball structures, beaded structure, carbonate micrite vein, autoclastic brecciated structure and pseudonodule, etc. Study shows that sedimentary period of Member 4-Member 3 of Shahejie formation is the intense activity period of the basin boundary fault. The obvious effect of seismism on hydrocarbon reservoir quality greatly improves the reservoir permeability whereas the improved porosity is seldom found. It is concluded that Seismite, especially the shattered rock and seismic-clastic breccia are as potential reservoir rocks. This provides new areas for petroleum exploration and development in the near future here.
引文
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[2]Pratt B R.Oceangraphy,bathymetry and syndepositional tectonics of a Precambrian intracratonic basin:integrating sediments,storms,earthquakes and tsunamis in the belt supergroup Helena formation,ca.1.45Ga,western north America[J].SedimentaryGeology,2001:141-142;371-394.
[3]乔秀夫,高林志,彭阳,等.古郯庐带沧浪铺阶地震事件、层序及构造意义[J].中国科学(D辑),2001,31(11):911-918.
[4]乔秀夫,宋天锐,高林志,等.碳酸盐岩振动液化地震序列[J].地质学报,1994,68(1):16-32.
[5]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.
[6]Kullberg J C,Olóriz F,Marques B,et al.Flat-pebble con-glomerates:a local marker for Early Jurassicseismicity relat-ed to syn-rift tectonics in the Sesimbra area(Lusitanian Basin,Portugal)[J].Sedimentary Geology,2001,139:49-70.
[7]Roep T B,Events A J.Pillow-beds:a new type of seismites?An example from an Oligocene turbidite fan complex.Ali-cante[J].Sedimentology,1992,39:711-724.
[8]Knaust D.Pinch-and-swell structures at the Middle/Upper Muschelkalk boundary(Triassic):evidence of earthquake ef-fects(seismites)in the Germanic basin[J].International Journal ofEarth Sciences,2002,91(2):291-303.
[9]Bauerman H.Report on the geology of the country near the forty-ninth parallel of north latitude west of the Rocky Moun-tains[J].Geological Survey of Canada Repor(t1882-83-84,pt.B),1985:1-42.
[10]Spallctta C,Vail G B.Upper Devonian intraclast parabrec-cias interpreted as seismites[J].Mar.Geol.,1984,55(1-2):133-144.
[11]杨剑萍,王辉,陈世悦,等.济阳凹陷古近纪地震积岩特征[J].沉积学报,2004,22(2):281-287.
[12]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):413-424.
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