鄂尔多斯盆地西南部宁县—庆阳地区长6期物源状况分析
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摘要
为查明鄂尔多斯盆地西南部宁县—庆阳地区长6期物源状况,揭示该地区沉积体系展布格局,在大量分析化验基础上,利用Dickinson三角投点图判别了物源区的构造背景,通过碎屑组分分布、重矿物组合分区、岩屑分布及地震剖面等多种角度对庆阳地区延长组长6油层组沉积时期的物源及源区母岩性质等进行了系统分析。结果表明,长6期物源区构造背景为构造较复杂的造山带,在宁县—庆阳地区存在了西部、西南和南部3个不同物源方向,东北部为混源区。古物源与沉积砂体展布空间配置关系良好,并决定了该地区长6时期的沉积体系分布格局。对该地区古物源进行分析将有助于下一步油气勘探的部署。
In order to ascertain the provenance of the Chang-6 Formation in the Ningxian-Qingyang region,in southwestern Ordos Basin,and to reveal the distribution of sedimentary system,this article,on the basis of analyses and assays,used the Dikinson triangular plot of sandstone clastic composition to determine the tectonic setting.The types of the parent rocks and the directions of sediment supply were discussed from clastic distribution,heavy mineral assemblages,sandstone distribution,etc.The results show that the tectonic setting of Chang-6 Formation is a complex orogenic belt and the principal sources are from west,southwest and south,and the northeast is the mixed provenance area in the Ningxian-Qingyang region.Provenance has a favorable spatial combination with depositional system,which determines the depositional system pattern of the Chang 6 Formation.
In order to ascertain the provenance of the Chang-6 Formation in the Ningxian-Qingyang region,in southwestern Ordos Basin,and to reveal the distribution of sedimentary system,this article,on the basis of analyses and assays,used the Dikinson triangular plot of sandstone clastic composition to determine the tectonic setting.The types of the parent rocks and the directions of sediment supply were discussed from clastic distribution,heavy mineral assemblages,sandstone distribution,etc.The results show that the tectonic setting of Chang-6 Formation is a complex orogenic belt and the principal sources are from west,southwest and south,and the northeast is the mixed provenance area in the Ningxian-Qingyang region.Provenance has a favorable spatial combination with depositional system,which determines the depositional system pattern of the Chang 6 Formation.
引文
[1]何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2003.
[2]付金华,罗安详,喻健,等.西峰油田油层组地质特征与勘探对策[J].石油学报,2004,25(2):25-29.
[3]刘少峰,柯爱蓉,吴丽云,等.鄂尔多斯西南缘前陆盆地沉积物物源分析及其构造意义[J].沉积学报,1997,15(1):156-160.
[4]宋凯,吕剑文,杜金良,等.鄂尔多斯盆地中部上三叠统延长组物源方向分析与三角洲沉积体系[J].古地理学报,2002,4(3):59-66.
[5]王莉,崔攀峰.鄂尔多斯盆地西峰油田长8含油层沉积相研究[J].西安石油大学学报:自然科学版,2005,18(6):27-30.
[6]赵俊兴,吕强,李凤杰,等.鄂尔多斯盆地南部延长组长6期物源状况分析[J].沉积学报,2008,26(4):610-616.
[7]Dickinson W R,Beard L S,Brakenridge G R,et al.provenanceof North American Phanerozoicsandstones in relation to tec-tonic setting[J].Bull GeolSoc Amer,1983,94:222-235.
[8]柯保嘉,陈昌明,陈志明,等.晚三叠世鄂尔多斯盆地西缘砾石质冲积扇沉积学[J].沉积学报,1991,9(3):11-21.
[9]刘少峰,柯爱蓉,吴丽云,等.鄂尔多斯西南缘前陆盆地沉积物物源分析及其构造意义[J].沉积学报,1997,15(1):156-160.
[10]赵俊兴,李凤杰,申晓莉,等.鄂尔多斯盆地南部长6和长7油层浊流事件的沉积特征及发育模式[J].石油学报,2008,29(3):389-394.
[11]王峰,田景春,张锦泉,等.鄂尔多斯盆地姬塬—胡尖山地区长6油层组的物源和优质储层分布[J].天然气地球科学,2006,17(6):783-788.
[12]李凤杰,王多云.鄂尔多斯盆地西峰油田延长组高分辨率层序地层学研究[J].天然气地球科学,2006,17(3):339-344.
[13]刘化清,廖建波,房乃珍,等.鄂尔多斯盆地环县地区长6沉积体系展布特征[J].沉积学报,2005,23(4):584-588.
[2]付金华,罗安详,喻健,等.西峰油田油层组地质特征与勘探对策[J].石油学报,2004,25(2):25-29.
[3]刘少峰,柯爱蓉,吴丽云,等.鄂尔多斯西南缘前陆盆地沉积物物源分析及其构造意义[J].沉积学报,1997,15(1):156-160.
[4]宋凯,吕剑文,杜金良,等.鄂尔多斯盆地中部上三叠统延长组物源方向分析与三角洲沉积体系[J].古地理学报,2002,4(3):59-66.
[5]王莉,崔攀峰.鄂尔多斯盆地西峰油田长8含油层沉积相研究[J].西安石油大学学报:自然科学版,2005,18(6):27-30.
[6]赵俊兴,吕强,李凤杰,等.鄂尔多斯盆地南部延长组长6期物源状况分析[J].沉积学报,2008,26(4):610-616.
[7]Dickinson W R,Beard L S,Brakenridge G R,et al.provenanceof North American Phanerozoicsandstones in relation to tec-tonic setting[J].Bull GeolSoc Amer,1983,94:222-235.
[8]柯保嘉,陈昌明,陈志明,等.晚三叠世鄂尔多斯盆地西缘砾石质冲积扇沉积学[J].沉积学报,1991,9(3):11-21.
[9]刘少峰,柯爱蓉,吴丽云,等.鄂尔多斯西南缘前陆盆地沉积物物源分析及其构造意义[J].沉积学报,1997,15(1):156-160.
[10]赵俊兴,李凤杰,申晓莉,等.鄂尔多斯盆地南部长6和长7油层浊流事件的沉积特征及发育模式[J].石油学报,2008,29(3):389-394.
[11]王峰,田景春,张锦泉,等.鄂尔多斯盆地姬塬—胡尖山地区长6油层组的物源和优质储层分布[J].天然气地球科学,2006,17(6):783-788.
[12]李凤杰,王多云.鄂尔多斯盆地西峰油田延长组高分辨率层序地层学研究[J].天然气地球科学,2006,17(3):339-344.
[13]刘化清,廖建波,房乃珍,等.鄂尔多斯盆地环县地区长6沉积体系展布特征[J].沉积学报,2005,23(4):584-588.
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