鄂尔多斯盆地延长期坳陷湖盆事件沉积记录
|
摘要
鄂尔多斯盆地延长期浊积岩、震积岩、凝灰岩等事件沉积垂向上均发育典型的沉积序列,可根据其沉积序列进行识别。其主要形成于长6期至长8期,平面上分布在盆地西南部的深湖区。从形成机制上看,构造运动触发了火山活动和强烈的地震。地震活动又触发(辫状河)三角洲前缘沉积物向深湖区移动,由牵引流转化为浊流。这几种事件沉积与油气聚集关系密切。浊积岩、震积岩具有一定的储集能力,构成深水区油气的主要储集体;而凝灰岩促进了优质烃源岩的形成,并加速其演化过程。
The turbidites,seismites and tuffs may be discriminated in terms of their vertical sedimentary sequences.The event deposits from the Yanchangian lacustrine basin in the Ordos Basin were initiated during the Chang-6 to Chang-8 stages.In a planar view,they are arranged in the deep-lake area in the southwestern part of the basin.The mechanisms for the formation of the event deposits have disclosed that the tectonic movements tend to give rise to the volcanic activities,followed by severe earthquakes.The earthquakes,in turn,may cause the braided delta front deposits to migrate toward the deep-lake area.All the event deposits outlined above are closely associated with hydrocarbon accumulation.The turbidites and seismites have certain reservoir potential,and thus may act as the main reservoir rocks in the deep-water areas.The tuffs may stimulate the formation and evolution of the excellent source rocks.
The turbidites,seismites and tuffs may be discriminated in terms of their vertical sedimentary sequences.The event deposits from the Yanchangian lacustrine basin in the Ordos Basin were initiated during the Chang-6 to Chang-8 stages.In a planar view,they are arranged in the deep-lake area in the southwestern part of the basin.The mechanisms for the formation of the event deposits have disclosed that the tectonic movements tend to give rise to the volcanic activities,followed by severe earthquakes.The earthquakes,in turn,may cause the braided delta front deposits to migrate toward the deep-lake area.All the event deposits outlined above are closely associated with hydrocarbon accumulation.The turbidites and seismites have certain reservoir potential,and thus may act as the main reservoir rocks in the deep-water areas.The tuffs may stimulate the formation and evolution of the excellent source rocks.
引文
[1]王起琮,李文厚,赵虹,等.鄂尔多斯盆地东南部三叠系延长组一段湖相浊积岩特征及意义[J].地质科学,2006,41(1):54-63.
[2]陈全红,李文厚,郭艳琴,等.鄂尔多斯盆地南部延长组浊积岩体系及油气勘探意义[J].地质学报,2006,80(5):656-663.
[3]李元昊,刘池洋,王秀娟,等.鄂尔多斯盆地三叠系延长组砂岩墙(脉)特征及其地质意义[J].中国地质,2007,34(3):400-317.
[4]夏青松,田景春.鄂尔多斯盆地南部上三叠统延长组震积岩的发现及地质意义[J].沉积学报,2007,25(2):246-252.
[5]夏青松,田景春,黄昌武.鄂尔多斯盆地上三叠统延长组震积岩识别标志研究[J].成都理工大学学报(自然科学版),2007,34(3):312-317.
[6]邱欣卫.鄂尔多斯盆地延长组凝灰岩夹层特征和形成环境[D].西北大学硕士学位论文,2008.
[7]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.
[8]傅强,吕苗苗,刘永斗.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义[J].沉积学报,2008,26(2):186-192.
[9]鄢继华,陈世悦,宋国奇,等.三角洲前缘滑塌浊积扇形成过程初探[J].沉积学报,2004,22(4):573-578.
[10]李琼.鄂尔多斯盆地西南地区深部地层放射性异常及其对烃源岩演化的影响[D].西北大学硕士学位论文,2007.
[11]赵俊兴,陈洪德,付锁堂,等.鄂尔多斯盆地南部延长组中几个重要事件沉积及其油气聚集关系[J].矿物岩石,2008,28(3):90-95.
[12]左智峰,戚颖,葛小瑞,等.鄂尔多斯盆地晚三叠世火山物质对油气成藏条件的影响[J].兰州大学学报(自然科学版),2008,44(3):12-15.
[13]包洪平,杨奕华,王晓方,等.同沉积期火山作用对鄂尔多斯盆地上古生界砂岩储层形成的意义[J].古地理学报,2007,9(4):397-406.
[2]陈全红,李文厚,郭艳琴,等.鄂尔多斯盆地南部延长组浊积岩体系及油气勘探意义[J].地质学报,2006,80(5):656-663.
[3]李元昊,刘池洋,王秀娟,等.鄂尔多斯盆地三叠系延长组砂岩墙(脉)特征及其地质意义[J].中国地质,2007,34(3):400-317.
[4]夏青松,田景春.鄂尔多斯盆地南部上三叠统延长组震积岩的发现及地质意义[J].沉积学报,2007,25(2):246-252.
[5]夏青松,田景春,黄昌武.鄂尔多斯盆地上三叠统延长组震积岩识别标志研究[J].成都理工大学学报(自然科学版),2007,34(3):312-317.
[6]邱欣卫.鄂尔多斯盆地延长组凝灰岩夹层特征和形成环境[D].西北大学硕士学位论文,2008.
[7]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.
[8]傅强,吕苗苗,刘永斗.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义[J].沉积学报,2008,26(2):186-192.
[9]鄢继华,陈世悦,宋国奇,等.三角洲前缘滑塌浊积扇形成过程初探[J].沉积学报,2004,22(4):573-578.
[10]李琼.鄂尔多斯盆地西南地区深部地层放射性异常及其对烃源岩演化的影响[D].西北大学硕士学位论文,2007.
[11]赵俊兴,陈洪德,付锁堂,等.鄂尔多斯盆地南部延长组中几个重要事件沉积及其油气聚集关系[J].矿物岩石,2008,28(3):90-95.
[12]左智峰,戚颖,葛小瑞,等.鄂尔多斯盆地晚三叠世火山物质对油气成藏条件的影响[J].兰州大学学报(自然科学版),2008,44(3):12-15.
[13]包洪平,杨奕华,王晓方,等.同沉积期火山作用对鄂尔多斯盆地上古生界砂岩储层形成的意义[J].古地理学报,2007,9(4):397-406.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心