鄂尔多斯盆地白豹-华池地区长6-3厚层块状砂岩成因
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摘要
鄂尔多斯盆地中部的白豹-华池地区延长组长6油层组的长6-3亚段以发育厚层块状砂岩为特征,对其成因的认识分歧很大。作者在众多前人研究成果的基础上,充分利用区内钻井岩心、测井及地震资料对长6-3厚层砂岩特征进行研究,认为它是由正常沉积与事件沉积所形成的砂体相互叠加而构成的。其中正常沉积为三角洲前缘砂体,事件沉积为地震作用所形成的砂体以及由地震作用导致三角洲前缘滑塌再搬运而形成的浊积砂体。2种作用、3种成因类型砂体在垂向上相互叠置、在平面上相互交叉,构成了该地区广泛分布的厚层砂岩。
The Chang 6 oil layer is located in the Baibao-Huachi region of the Ordos Basin centre.It is one of the most developed regions and reservoirs,but also one of the most important producing formations in the basin.The Chang 6-3 sub-paragraph of the Chang 6 oil layer is characterized by the thick massive sandstone.For the origin of the thick massive sandstone of the Chang 6-3 sub-paragraph,different scholars have different opinions.Based on the previous studies,by full use of cores,well-logging data and seismic interpretation information,and through analysing the thick sandstone characteristics of the Chang 6-3 sub-paragraph,the paper regards the thick massive sandstone of the Chang 6-3 sub-paragraph is overlapped by the sandbody of normal sedimentation and the sandbody of events deposits.The sandbody of normal sedimentation is the delta front sandbody.The sandbody of events deposits formed by two major categories of functions includes the earthquake shock sandbody and the turbidite deposition sandbody.Two functions,three types of sandbodies overlapped vertically and in the plane intersected to form a wide distribution of thick layer sandstones in the region.
The Chang 6 oil layer is located in the Baibao-Huachi region of the Ordos Basin centre.It is one of the most developed regions and reservoirs,but also one of the most important producing formations in the basin.The Chang 6-3 sub-paragraph of the Chang 6 oil layer is characterized by the thick massive sandstone.For the origin of the thick massive sandstone of the Chang 6-3 sub-paragraph,different scholars have different opinions.Based on the previous studies,by full use of cores,well-logging data and seismic interpretation information,and through analysing the thick sandstone characteristics of the Chang 6-3 sub-paragraph,the paper regards the thick massive sandstone of the Chang 6-3 sub-paragraph is overlapped by the sandbody of normal sedimentation and the sandbody of events deposits.The sandbody of normal sedimentation is the delta front sandbody.The sandbody of events deposits formed by two major categories of functions includes the earthquake shock sandbody and the turbidite deposition sandbody.Two functions,three types of sandbodies overlapped vertically and in the plane intersected to form a wide distribution of thick layer sandstones in the region.
引文
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[9]SHANMUGAM G.High-density turbidity currents:are they sandy debrisflows-[J].Journal of Sedimen-tary Research,1996,66:2-10.
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[2]王琪,禚喜准,陈国俊,等.鄂尔多斯西部长6砂岩成岩演化与优质储层[J].石油学报,2005,26(5):17-23.
[3]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.
[4]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.
[5]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地质地球化学特征[J].地球化学,2005,34(2):147-154.
[6]黄智辉.地球物理测井资料在分析沉积环境中的应用[M].北京:地质出版社,1986:46-57.
[7]李凤杰,王多云,宋广寿,等.陕甘宁盆地坳陷型湖盆缓坡带三角洲前缘短期基准面旋回与储层成因分析[J].沉积学报,2004,21(1):73-78.
[8]李凤杰,王多云,郑希民,等.陕甘宁盆地华池地区延长组缓坡带三角洲前缘的微相构成[J].沉积学报,2002,20(4):582-587.
[9]SHANMUGAM G.High-density turbidity currents:are they sandy debrisflows-[J].Journal of Sedimen-tary Research,1996,66:2-10.
[10]SHANMUGAM G.50years of the turbidite para-digm(1950-1990s):deep-water processes and fa-cies models-a critical perspective[J].Marine and Petroleum Geology,2000,17:285-342.
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