鄂尔多斯盆地白豹—华池地区延长组长6油层组沉积体系及砂体成因研究
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摘要
本论文在前人众多研究成果的基础上,以沉积学、岩相古地理及层序地层学理论为指导,充分利用钻井、测井和测试分析资料,通过沉积构造、岩性特征、测井特征及砂岩特征对鄂尔多斯盆地白豹-华池地区延长组长6油层组沉积体系及砂体成因进行了深入研究。
通过对鄂尔多斯盆地延长组区域地质构造演化分析,得出白豹-华池地区长6沉积期的湖盆演化是一个萎缩充填的过程。
通过对岩性标志、沉积构造、粒度分布特征、沉积序列、古生物标志及测井相标志的分析,在研究区长6沉积期识别出湖泊三角洲沉积体系和湖泊沉积体系。其中湖泊三角洲为三角洲前缘亚相,湖泊沉积体系为半深湖-深湖亚相。其中三角洲前缘可进一步划分为水下分流河道、河口坝、水下天然堤和水下决口扇、分流间湾、半深湖-深湖泥及浊积岩沉积微相。
通过对长6_1、长6_2、长6_3期砂体展布规律研究及岩相古地理编图,结合沉积相标志研究、沉积类型划分及特征研究从而建立了研究区长6沉积期沉积模式。
通过大量的岩心观察及测试分析资料系统研究了区内长6砂体成因类型及特征,白豹-华池地区长6砂体成因既包括正常沉积作用成因,又包括事件沉积作用成因。正常沉积作用所形成的砂体主要为来自东北曲流河三角洲体系控制的三角洲前缘砂体,并可进一步划分为水下分流河道砂体、河口坝砂体、叠置水下分流河道砂体、叠置河口坝、水下分流河道和河口坝叠加的复合型砂体。事件沉积作用所形成的砂体包括地震事件成因砂体与浊流事件成因砂体的叠置复合砂体、事件成因砂体与正常沉积成因砂体的叠置复合砂体。
Introduction of the author:Longhao male, was born in April, 1986 whose tutor was Professor Tianjingchun . He graduated from Chengdu University of Technology in Sedimentology major and was granted the Master Degree in June,2011. Based on the previous studis,borehole,well logging data and other analysis,this thesis studies the sedimentary structure , lithology and well logging characteristics with the guidance of sedimentology , sedimentary facies and palaeogeography and sequence stratigraphy, according to which we finally investigate the depositional system and sandstone genesis in Chang 6 oil-bearing Formation of Yanchang Formation in Baibao-Huachi area,Ordos Basin.
By analyzing regional tectonic evolution of Yanchang Formation,we consider the lake basin of Chang 6 Formation was developing in a shrinking-filling style.
We identifies the lake delta deposit system and lake deposit system in study area by means of lithologic symbols,sedimentary structures,grain size distribution,depositional sequence,paleogene fossils and logging facies.Moreover,we confirm the lake delta is delta-front subfacies while the lake deposit system is half-deep lake to deep lake subfacies.Furthermore,the delta-front subfacies can be divided into subaqueous distributary channel,debouch bar,underwater natural levee,underwater crevasse fan,interdistributary,half-deep to deep lake mud and turbidite microfacies.
We have did comprehensive research on the sandstone distribution of Chang 6_1,Chang 6_2, and Chang 6_3,and compliled the lithofacies paleogeography map.Combining the sedimentary symbols,types and characteristics we then establish the sedimentary model for Chang 6 Formation.
Genetic types and the characteristics of sandbodies in Chang 6 formation are systematically researched through plenty of core observations and testing data, it can be found that both normal deposits and event deposits exist in Chang 6 formation in Baibao-Huachi area. The sandbodies caused from normal deposit are mainly delta front sandbodies controlled by meanderingriver delta system from northeast, further including underwater distributary channel, mount bar, superpose underwater distributary channel, superpose mount bar and mixed types. The sandbodies resulted from event deposits include earthquake and turbidity current causing superimposed type and the type mixed by event deposit and normal deposit causing sandbodies.
通过对鄂尔多斯盆地延长组区域地质构造演化分析,得出白豹-华池地区长6沉积期的湖盆演化是一个萎缩充填的过程。
通过对岩性标志、沉积构造、粒度分布特征、沉积序列、古生物标志及测井相标志的分析,在研究区长6沉积期识别出湖泊三角洲沉积体系和湖泊沉积体系。其中湖泊三角洲为三角洲前缘亚相,湖泊沉积体系为半深湖-深湖亚相。其中三角洲前缘可进一步划分为水下分流河道、河口坝、水下天然堤和水下决口扇、分流间湾、半深湖-深湖泥及浊积岩沉积微相。
通过对长6_1、长6_2、长6_3期砂体展布规律研究及岩相古地理编图,结合沉积相标志研究、沉积类型划分及特征研究从而建立了研究区长6沉积期沉积模式。
通过大量的岩心观察及测试分析资料系统研究了区内长6砂体成因类型及特征,白豹-华池地区长6砂体成因既包括正常沉积作用成因,又包括事件沉积作用成因。正常沉积作用所形成的砂体主要为来自东北曲流河三角洲体系控制的三角洲前缘砂体,并可进一步划分为水下分流河道砂体、河口坝砂体、叠置水下分流河道砂体、叠置河口坝、水下分流河道和河口坝叠加的复合型砂体。事件沉积作用所形成的砂体包括地震事件成因砂体与浊流事件成因砂体的叠置复合砂体、事件成因砂体与正常沉积成因砂体的叠置复合砂体。
Introduction of the author:Longhao male, was born in April, 1986 whose tutor was Professor Tianjingchun . He graduated from Chengdu University of Technology in Sedimentology major and was granted the Master Degree in June,2011. Based on the previous studis,borehole,well logging data and other analysis,this thesis studies the sedimentary structure , lithology and well logging characteristics with the guidance of sedimentology , sedimentary facies and palaeogeography and sequence stratigraphy, according to which we finally investigate the depositional system and sandstone genesis in Chang 6 oil-bearing Formation of Yanchang Formation in Baibao-Huachi area,Ordos Basin.
By analyzing regional tectonic evolution of Yanchang Formation,we consider the lake basin of Chang 6 Formation was developing in a shrinking-filling style.
We identifies the lake delta deposit system and lake deposit system in study area by means of lithologic symbols,sedimentary structures,grain size distribution,depositional sequence,paleogene fossils and logging facies.Moreover,we confirm the lake delta is delta-front subfacies while the lake deposit system is half-deep lake to deep lake subfacies.Furthermore,the delta-front subfacies can be divided into subaqueous distributary channel,debouch bar,underwater natural levee,underwater crevasse fan,interdistributary,half-deep to deep lake mud and turbidite microfacies.
We have did comprehensive research on the sandstone distribution of Chang 6_1,Chang 6_2, and Chang 6_3,and compliled the lithofacies paleogeography map.Combining the sedimentary symbols,types and characteristics we then establish the sedimentary model for Chang 6 Formation.
Genetic types and the characteristics of sandbodies in Chang 6 formation are systematically researched through plenty of core observations and testing data, it can be found that both normal deposits and event deposits exist in Chang 6 formation in Baibao-Huachi area. The sandbodies caused from normal deposit are mainly delta front sandbodies controlled by meanderingriver delta system from northeast, further including underwater distributary channel, mount bar, superpose underwater distributary channel, superpose mount bar and mixed types. The sandbodies resulted from event deposits include earthquake and turbidity current causing superimposed type and the type mixed by event deposit and normal deposit causing sandbodies.
引文
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[2]Spalleta C.Vai G B. Upper Devonian intraclast parabreccias interpreted as siesmites. Mar Geo,1984(55):133~144.
[3]Seilacher A. Sedimentary structures tentatively attributed to seismic events. Mar Geol,1984,55(1):1~12.
[4]Jesse Harlan Johnson.The Benton fauna of eastern Colorado and Kansas and its recorded geologic range. Journal of Paleontology, Jun 1930; 4: 193– 196.
[5]乔秀夫,宋天锐,高林志.碳酸盐岩振动液化地震序列.地质学报,1994.68(1):16-34.
[6]乔秀夫,宋天锐,李海兵,高林志.辽东半岛南部震旦系-下寒武统成因地层,北京:科学出版社,1995.
[7]梁定益,聂泽同,万晓樵,陈国民.试论震积岩及震积不整合-以川西、滇西为例.现代地质,1991.5(2):138~146.
[8]梁定益,聂泽同,宋志敏.再论震积岩及震积不整合-以川西、滇西为例.地球科学.1994.19(6):843~850.
[9]吴贤涛,尹国勋.四川峨眉晚侏罗世湖泊沉积中震积岩的发现及其意义.沉积学报,1992(01).
[10]吴崇筠,薛叔浩.我国油区碎屑岩沉积学研究现状.矿物岩石地球化学通报,1988(02).
[11]赵澄林,刘孟慧.内蒙阿南凹陷中生代储层沉积特征和地质模式.石油大学学报(自然科学版),1991(02).
[12]白云来,王新民,刘化清等.鄂尔多斯盆地西部边界的确定及其地球动力学背景[J].甘肃地质,2006,80(6):793-812.
[13]长庆石油勘探局.陕甘宁盆地中生界陆相油田地质规律与勘探经验(内部报告),1994.
[14]长庆油田石油地质志编写组.中国石油地质志,卷十二,长庆油田[M].北京:石油工业出版社,1992.
[15]陈安宁,韩永林,杨飑等.鄂尔多斯盆地三叠系延长统成藏地质特征及油藏类型.见:长庆油田公司勘探开发研究院编鄂尔多斯盆地油气勘探开发论文集(1990-2000).北京:石油工业出版社,33-46.
[16]顾家裕.陆相盆地层序地层学格架概念及模式[J].石油勘探与开发,1995,22(4):6-10
[17]郭忠铭,张军,于忠平.鄂尔多斯地块油区构造演化特征[J].石油勘探与开发,1994,21(2):22-29.
[18]何自新,杨华,袁效奇.鄂尔多斯盆地地质剖面图集[M].北京:石油工业出版社,2005:180-199.
[19]何自新等著.鄂尔多斯盆地演化与油气.北京:石油工业出版社,2003 .
[20]蔺宏斌,姚泾利.鄂尔多斯盆地南部延长组沉积特性与物源探讨[J],.西安石油学院学报,2000,15(5):8-9.
[21]刘宝珺,曾允孚主编.岩相古地理基础和工作方法[M].北京:地质出版社,1985.
[22]刘池洋,赵红格,王峰等.鄂尔多斯盆地西缘(部)中生代构造属性[J].地质学报,(79)6:737-747.
[23]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-以鄂尔多斯盆地姬塬白豹地区三叠系延长组为例[J].成都理工大学学报(自然科学版),2004,31(6):636-640.
[24]田景春,隆昊,苏楠等.鄂尔多斯盆地白豹-华池地区长6-3厚层块状砂岩成因.成都理工大学学报(自然科学版),2010(04).
[25]王多云,李凤杰,王峰等.储层预测和油藏描述中的一些沉积学问题[J].沉积学报,2004,22(2):193-197.
[26]王多云,史基安,郑希民等.陇东地区三叠系长6-8优质储层形成机理及勘探有利区预测(科研报告).中国科学院兰州地质研究所,2002.
[27]王峰,田景春,陈蓉等.西峰油田长8油层组高分辨率层序地层分析[J].成都理工大学学报(自然科学版),2006,33(6):581-586.
[28]王峰,王多云,高明书等.陕甘宁盆地姬塬地区三叠系延长组三角洲前缘的微相组合及特征[J].沉积学报,2005,23(1):218-220.
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