郭局子洼陷风暴沉积岩特征及分析
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摘要
本次研究首次在郭局子洼陷沙河街组发现风暴岩沉积岩。郭局子洼陷是目前车镇凹陷内部勘探程度最低的次级洼陷之一。为典型的"北断南超"式的断陷湖盆沉积。前人的研究认为,湖盆内的主要储层发育在陡坡带的近岸水下扇和缓坡带的三角洲前缘带。经过对洼陷资料的重新分析,认为在沙河街组地层沉积时期,湖泊水面广阔,地形平缓,总体水体较浅,为浅水广湖的地质背景,在风暴等事件的影响下,易产生风暴回流物质,形成风暴岩沉积。笔者通过对盆地内部取心井岩心的细致观察,辅以三维地震属性分析,证明了风暴岩沉积在洼陷缓坡带广泛存在,并对其特征进行描述。风暴岩的发现丰富了本区的储层类型,对本区的岩相古地理恢复和油气勘探都具有重要意义。
This research firstly defines the tempestites of the Shahejie formation in Guojuzi sag.Guojuzi sag has a poorest degree of exploration in Chezhen depression which is a typical half-graben basin.The former viewpoint is that the main reservoirs are in the subwater fan and delta front.Base on the detail analysis,the writer think that the geological backgrounds,which are broad lake, gentle terrain and shallow water,benefit the developing of tempestites.On the basis of core observation,grain and seismic data analysis,the writer found the evidences to prove the existence of abundant tempestites in Guojuzi sag,The discovery and analysis of tempestites is very important for reconstructing the palaeogeography and further oil and gas exploitation.
This research firstly defines the tempestites of the Shahejie formation in Guojuzi sag.Guojuzi sag has a poorest degree of exploration in Chezhen depression which is a typical half-graben basin.The former viewpoint is that the main reservoirs are in the subwater fan and delta front.Base on the detail analysis,the writer think that the geological backgrounds,which are broad lake, gentle terrain and shallow water,benefit the developing of tempestites.On the basis of core observation,grain and seismic data analysis,the writer found the evidences to prove the existence of abundant tempestites in Guojuzi sag,The discovery and analysis of tempestites is very important for reconstructing the palaeogeography and further oil and gas exploitation.
引文
[1]王蛟,姜在兴.渤海湾盆地车镇凹陷古近系层序地层与隐蔽油气藏吉林大学学报(地球科学版)2005,35(2):163~169.
[2]胡明毅,贺萍.潮坪风暴沉积特征及其研究意义[J].地球科学进展,2002,17(3):391~395.
[3]S.Leleu,J.F.Ghienne,and G.Manatschal《Upper Cretaceous-Palaeocene basin-margin alluvial fansdocumenting interaction between tectonicand environmental process(Provence,SEFrance)》Geological Society SpecialPublications(2005),251,217~239.
[4]姜在兴,赵澄林,刘孟慧.东濮凹陷西部湖相风暴沉积的初步研究[J].沉积学报,1990,8(2):107~113.
[5]庞雄,陈长民,彭大钧等.南海珠江深水扇系统的层序地层学研究.地学前缘,2007,14(1):221~229.
[6]姜在兴.沉积学.石油工业出版社,2003,5.
[7]杨剑萍.惠民凹陷中央隆起带西部下第三系沙河街组三段上部的风暴重力流沉积[J].石油大学学报(自然科学版),2000,24(1):26~29.
[2]胡明毅,贺萍.潮坪风暴沉积特征及其研究意义[J].地球科学进展,2002,17(3):391~395.
[3]S.Leleu,J.F.Ghienne,and G.Manatschal《Upper Cretaceous-Palaeocene basin-margin alluvial fansdocumenting interaction between tectonicand environmental process(Provence,SEFrance)》Geological Society SpecialPublications(2005),251,217~239.
[4]姜在兴,赵澄林,刘孟慧.东濮凹陷西部湖相风暴沉积的初步研究[J].沉积学报,1990,8(2):107~113.
[5]庞雄,陈长民,彭大钧等.南海珠江深水扇系统的层序地层学研究.地学前缘,2007,14(1):221~229.
[6]姜在兴.沉积学.石油工业出版社,2003,5.
[7]杨剑萍.惠民凹陷中央隆起带西部下第三系沙河街组三段上部的风暴重力流沉积[J].石油大学学报(自然科学版),2000,24(1):26~29.
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