鄂尔多斯盆地合水地区长7段重力流沉积特征及分布规律
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摘要
结合前人对鄂尔多斯盆地延长组深水重力流的大量实践和研究,选取鄂尔多斯盆地合水地区为研究区块,通过岩心观察、测井解释成果等资料对该研究区深水重力流沉积类型及特征分小层进行描述。将长7油层组三分,精细剖析了长7油层组各小层岩心资料,总结其重力流沉积特征与规律。结果表明:合水地区长7段重力流沉积类型以砂质碎屑流、似涌浪浊流、准稳态浊流和滑塌沉积为主,各小层略有差异;平面上以"朵体"的形式沿斜坡向研究区中心滑动。利用岩心资料分析了滑动岩体、滑塌沉积、砂质碎屑流沉积和浊流沉积的发育特征,得出了重力流沉积沿搬运方向以滑塌沉积-浊流沉积-砂质碎屑流沉积渐变的分布规律。
Based on a large number of previous studies on deep-water gravity flow in Yanchang Formation of Ordos Basin,the sedimentary types and characteristics of deep-water gravity flow in each sublayer of Yanchang Formation in Heshui area of Ordos Basin are described through core observation and log interpretation. Chang 7 reservoir group are divided into three small layers,core data of the small layers are analyzed carefully,and their distribution characteristics and rules are summarized. The results show that in Heshui area,the gravity flow deposits of Chang 7 Member are mainly sandy clastic flow,surge-like turbidity flow,quasi-steady turbidity flow and slump deposits,with slight differences among the small layers. On the plane,they slides along the slope to the center of the study area in the form of " flower-body". The development characteristics of sliding rock mass,slump deposit,sandy clastic flow deposit and turbidity flow deposit are analyzed by using core data,and the gradual distribution of gravity flow deposit along the transport direction of slump deposit-turbidity deposit-sandy clastic flow deposit is obtained.
Based on a large number of previous studies on deep-water gravity flow in Yanchang Formation of Ordos Basin,the sedimentary types and characteristics of deep-water gravity flow in each sublayer of Yanchang Formation in Heshui area of Ordos Basin are described through core observation and log interpretation. Chang 7 reservoir group are divided into three small layers,core data of the small layers are analyzed carefully,and their distribution characteristics and rules are summarized. The results show that in Heshui area,the gravity flow deposits of Chang 7 Member are mainly sandy clastic flow,surge-like turbidity flow,quasi-steady turbidity flow and slump deposits,with slight differences among the small layers. On the plane,they slides along the slope to the center of the study area in the form of " flower-body". The development characteristics of sliding rock mass,slump deposit,sandy clastic flow deposit and turbidity flow deposit are analyzed by using core data,and the gradual distribution of gravity flow deposit along the transport direction of slump deposit-turbidity deposit-sandy clastic flow deposit is obtained.
引文
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[14]李祥辉,王成善,金玮,等.深海沉积理论发展及其在油气勘探中的意义[J].沉积学报,2009,27(1):77-86.LI Xianghui,WANG Chengshan,JIN Wei,et al. A review on deep-sea sedimentation theory:significancesto oil-gas exploration[J]. Acta Sedimentologica Sinica,2009,27(1):77-86.
[2]付金华,邓秀芹,张晓磊,等.鄂尔多斯盆地三叠系延长组深水砂岩与致密油的关系[J].古地理学报,2013,15(5):624-634.FU Jinhua,DENG Xiuqin,ZHANG Xiaolei,et al. Relationship between deepwater sandstone and tight oil of the Triassic Yanchang Formation in Ordos Basin[J]. Journal of Palaeogeography,2013,15(5):624-634.
[3]李相博,刘化清,张忠义,等.深水块状砂岩碎屑流成因的直接证据:“泥包砾”结构:以鄂尔多斯盆地上三叠统延长组研究为例[J].沉积学报,2014,32(4):611-621.LI Xiangbo,LIU Huaqing,ZHANG Zhongyi,et al.“Argillaceous parcel”structure:a direct evidence of debris flow origin of deep-water massive sandstone of Yanchang Formation,Upper Triassic,the Ordos Basin[J]. Acta Sedimentologica Sinica,2014,32(4):611-621.
[4]林卫兵,陈林,陆永潮,等.鄂尔多斯盆地西南部镇泾地区长8油层组致密储层评价[J].地质与勘探,2017,53(2):381-389.LIN Weibing,CHEN Lin,LU Yongchao,et al. Tight reservoir evaluation of the Chang 8 oil group in the Zhenjing area,southwestern Ordos Basin[J]. Geology and Exploration,2017,53(2):381-389.
[5]邹才能,赵政璋,杨华,等.陆相湖盆深水砂质碎屑流成因机制与分布特征:以鄂尔多斯盆地为例[J].沉积学报,2009,12(6):1065-1075.ZOU Caineng,ZHAO Zhengzhang,YANG Hua,et al. Genetic mechanism and distribution of sandy debris flows in terrestrial Lacustrine Basin[J]. Acta Sedimentologica Sinica,2009,12(6):1065-1075.
[6]赵云翔,陈景山,王建峰,等.鄂尔多斯盆地延长组长9砂体的垂向结构及主控因素分析[J].沉积学报,2013,31(1):77-88.ZHAO Yunxiang,CHEN Jingshan,WANG Jianfeng,et al.Vertical structure and dominating factors of Chang 9 sandbody from Yanchang formation in Ordos Basin[J]. Acta Sedimentologica Sinica,2013,31(1):77-88.
[7]袁珍,李文厚,范萌萌,等.深水块状砂岩沉积特征及其成因机制探讨:以鄂尔多斯盆地东南缘上三叠统长6油层组为例[J].地质科技情报,2011,30(4):43-49.YUAN Zhen,LI Wenhou,FAN Mengmeng,et al. Genetic mechanism and sedimentary features of deep water massive sandstone:a case study of the Upper Triassic sandstones of Chang 6 formation in the southeast of Ordos Basin[J]. Geological Science and Technology Information,2011,30(4):43-49.
[8]鲜本忠,安思奇,施文华.水下碎屑流沉积:深水沉积研究热点与进展[J].地质论评,2014,53(1):36-43.XIAN Benzhong,AN Siqi,SHI Wenhua. Subaqueous debris flow:hotspots and advances of deep-water sedimention[J]. Geological Review,2014,53(1):36-43.
[9]邓秀芹,付金华,姚泾利,等.鄂尔多斯盆地中及上三叠统延长组沉积相与油气勘探的突破[J].古地理学报,2011,13(4):443-455.DENG Xiuqin,FU Jinhua,YAO Jingli,et al. Sedimentary facies of the Middle-Upper Triassic Yanchang formation in Ordos Basin and breakthrough in petroleum exploration[J]. Journal of Palaeogeography,2011,13(4):443-455.
[10]罗顺社,李梦杰,刘俊,等.定边-吴起地区长6砂体结构对油藏分布的控制[J].特种油气藏,2015,22(2):8-22.LUO Shunshe,LI Mengjie,LIU Jun,et al. Control over reservoir distribution by Chang-6 sandstone structure in Dingbian-Wuqi area[J]. Special Oil&Gas Reservoirs,2015,22(2):8-22.
[11]董艳蕾,朱筱敏,曾洪流,等.黄骅坳陷歧南凹陷古近系沙一层序地震沉积学研究[J].沉积学报,2008,26(2):235-240.DONG Yanlei,ZHU Xiaomin,ZENG Hongliu,et al. Seismic sedimentology study on Shayi Sequence in Qinan Sag,Huanghua Depression[J]. Acta Sedimentologica Sinica,2008,26(2):235-240.
[12]李存磊,任伟伟,唐明明.流体性质转换机制在重力流沉积体系分析中应用初探[J].地质论评,2012,58(2):285-296.LI Cunlei,REN Weiwei,TANG Mingming. Preliminary study on gravity flow depositional system based on fluid properties conversion theory[J]. Geological Review,2012,58(2):285-296.
[13]郑荣才,文华国,韩永林,等.鄂尔多斯盆地白豹地区长6油层组湖底滑塌浊积扇沉积特征及其研究意义[J].成都理工大学学报(自然科学版),2006,33(6):566-575.ZHENG Rongcai,WEN Huaguo,HAN Yonglin,et al.Discovery and significance of sublacustrine slump turbidite fans in Chang 6 oil-bearing formation of Baibao region in Ordos Basin,China[J]. Journal of Chengdu University of Technology(Science&Technology Edition),2006,33(6):566-575.
[14]李祥辉,王成善,金玮,等.深海沉积理论发展及其在油气勘探中的意义[J].沉积学报,2009,27(1):77-86.LI Xianghui,WANG Chengshan,JIN Wei,et al. A review on deep-sea sedimentation theory:significancesto oil-gas exploration[J]. Acta Sedimentologica Sinica,2009,27(1):77-86.