鄂尔多斯盆地南部中生界延长组物源与盆地底形分析
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摘要
通过重矿物、岩屑及碎屑成分的特征研究,认为鄂尔多斯盆地延长组主要受到3大物源控制,并且可进一步划分出6个次级物源;岩性、古生物对比和物源、古地理研究证明,在延长组中期,不存在来自正东方向的"富县三角洲";通过长7高阻泥岩、有效烃源岩分布特征及沉积相、地震相研究,认为盆地底形具有"南陡北缓、西陡东缓"的特点,这种特点造成了盆地东北部主要属于缓坡型湖泊三角洲体系,而在南部、西南部则属于陡坡型扇三角洲及三角洲前缘末端的浊积扇沉积。这些认识必将有助于今后盆地的油气勘探部署。
Based on the research of heavy minerals,debris and clastic composition,the paper indicates that there are mainly three sediment source regions and six sub-source areas in Ordos Basin.The authors consider that the Fuxian delta from the east sources does not exit in the Yanchang mid-period by studying the provenance and paleogeography and comparing lithology and paleontological.Finally,the paper also discusses the bottom shape of the lake basin of Yanchang period in Ordos based on the research of the distribution feature of mudstone of Member 7 of Yanchang Formation,effective hydrocarbon source rocks, seismic profile and sedimentary facies.The results show that the basin is wider in the north,steeper in the south,steeper in the west and wider in the east of Ordos Basin,and at the same time,the northeast delta belongs to a gentle-slope lake delta system,but the south and southwest delta mainly belongs to a steep-slope fan-delta and there exists turbidite fan sediment on the end of the delta front.These recognitions must be helpful to the oil and gas exploration of Ordos Basin in the future.
Based on the research of heavy minerals,debris and clastic composition,the paper indicates that there are mainly three sediment source regions and six sub-source areas in Ordos Basin.The authors consider that the Fuxian delta from the east sources does not exit in the Yanchang mid-period by studying the provenance and paleogeography and comparing lithology and paleontological.Finally,the paper also discusses the bottom shape of the lake basin of Yanchang period in Ordos based on the research of the distribution feature of mudstone of Member 7 of Yanchang Formation,effective hydrocarbon source rocks, seismic profile and sedimentary facies.The results show that the basin is wider in the north,steeper in the south,steeper in the west and wider in the east of Ordos Basin,and at the same time,the northeast delta belongs to a gentle-slope lake delta system,but the south and southwest delta mainly belongs to a steep-slope fan-delta and there exists turbidite fan sediment on the end of the delta front.These recognitions must be helpful to the oil and gas exploration of Ordos Basin in the future.
引文
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[2]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.
[3]赵俊兴,陈洪德,向芳,等.鄂尔多斯盆地中部延安地区中侏罗统延安组高分辨率层序地层研究[J].沉积学报,2003,21(2):307-312.
[4]田景春,陈高武,窦伟坦,等.湖泊三角洲前缘砂体成因组合形式和分布规律[J].成都理工大学学报(自然科学版),2004,31(6):636-640.
[5]付金华,郭正权,邓秀芹.鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义[J].古地理学报,2005,7(1):34-43.
[6]赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,21(3):409-415.
[7]杨华,张文正.论鄂尔多斯盆地长7段优质油源岩在低渗透油气成藏富集中的主导作用[J].地球化学,2005,34(2):147-153.
[8]赵俊兴,李凤杰,申晓莉,等.鄂尔多斯盆地南部长6-长7浊流事件的沉积特征、发育模式及其地质意义[J].石油学报,2008,(3):389-394.
[9]赵重远.华北克拉通天然气赋存的地质背景[J].地球科学进展,1990,(2):40-42.
[10]山西省地矿局.山西省区域地质志[M].北京:地质出版社,1990.
[11]曾少华.陕北三叠系延长统湖盆三角洲沉积模式的建立[J].石油与天然气地质,1992,13(2):230-235.
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