鄂尔多斯盆地延长组中部层序地层格架及有利储层分布
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摘要
为理清鄂尔多斯盆地延长组中部层序地层格架与有利储层分布,在岩心、测井和地震资料综合解释的基础上,利用基准面升降等高分辨率层序地层分析方法,将SQ3层序划分为5个中期基准面旋回(MSC1—MSC5),建立了高分辨率层序地层格架。高分辨率层序地层单元沉积相构成与有利储层分布研究结果表明,SQ3层序有利储集区的分布受控于层序发育位置,MSC1旋回有利储层分布于辫状河三角洲前缘中部至湖盆边缘一带,靠近湖盆中心部位薄层透镜状油藏发育;MSC2—MSC4旋回有利储层主要分布于辫状河三角洲前缘中部至湖盆中心方向,水下分流河道砂体与烃源岩呈指状交互接触,油气成藏条件最为有利。
Based on the integrated analysis of core,well logging and seismic data,we take measures of high-resolution sequence stratigraphic analysis such as promotion and demotion of the base level to divide SQ3 sequence into 5 medium-term base level cycles and establish the high-resolution sequence stratigraphy framework to clarify the sequence stratigraphic composition and favorable reservoir distribution of central Yanchang group in Ordos Basin.Studies on the composition of the sedimentary faces in highresolution sequence stratigraphy units and the distribution of the sand body reveal that the favorable reservoirs distribution of SQ3 sequence is controlled by the position of this suit of sequence where it is developed.The distribution of the favorable reservoir areas in MSC1 circle ranges from the middle area of the braided river delta lips to the edge of the lake basin and the area which locates near the lake basin center that is featured with the occurrence of thin lentoid reservoirs,and the favorable reservoirs of MSC2 MSC4 circles mainly are mainly distributed in areas from the middle area of braided river delta lips to the lake basin center.The sand body of underwater division channel and hydrocarbons are finger contacted,which makes it perfect for hydrocarbon accumulation.
Based on the integrated analysis of core,well logging and seismic data,we take measures of high-resolution sequence stratigraphic analysis such as promotion and demotion of the base level to divide SQ3 sequence into 5 medium-term base level cycles and establish the high-resolution sequence stratigraphy framework to clarify the sequence stratigraphic composition and favorable reservoir distribution of central Yanchang group in Ordos Basin.Studies on the composition of the sedimentary faces in highresolution sequence stratigraphy units and the distribution of the sand body reveal that the favorable reservoirs distribution of SQ3 sequence is controlled by the position of this suit of sequence where it is developed.The distribution of the favorable reservoir areas in MSC1 circle ranges from the middle area of the braided river delta lips to the edge of the lake basin and the area which locates near the lake basin center that is featured with the occurrence of thin lentoid reservoirs,and the favorable reservoirs of MSC2 MSC4 circles mainly are mainly distributed in areas from the middle area of braided river delta lips to the lake basin center.The sand body of underwater division channel and hydrocarbons are finger contacted,which makes it perfect for hydrocarbon accumulation.
引文
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[18]卢进才,李玉宏,魏仙样,等.鄂尔多斯盆地三叠系延长组长7油层组油页岩沉积环境与资源潜力研究[J].吉林大学学报:地球科学版,2006,36(6):928-932.
[2]倪新锋,陈洪德,韦东晓.鄂尔多斯盆地三叠系延长组层序地层格架与油气勘探[J].中国地质,2007,34(1):73-79.
[3]傅强,李益.鄂尔多斯盆地三叠系延长组长8—长7油层组高分辨率层序地层格架及其地质意义[J].现代地质,2006,20(4):579-584.
[4]毛明陆,李元昊.鄂尔多斯盆地三叠系延长组层序地层特征[J].低渗透油气田,2005,10(4):5-11.
[5]王宏波,郑希民,冯明.鄂尔多斯盆地三叠系延长组层序地层与生储盖组合特征[J].天然气地球科学,2006,17(5):677-681.
[6]陈洪德,倪新锋.陇东地区三叠系延长组沉积层序及充填响应特征[J].石油与天然气地质,2006,27(2):143-151.
[7]王峰,田景春,陈蓉.盐定地区三叠系延长组层序地层特征与生储盖组合[J].新疆地质,2007,25(1):96-100.
[8]何义中,陈洪德,张锦泉.鄂尔多斯盆地中部石炭系二叠系两类三角洲沉积机理探讨[J].石油与天然气地质,2001,22(1):68-71.
[9]丁晓琪,张哨楠.鄂尔多斯盆地西南缘中生界成岩作用及其对储层物性的影响[J].油气地质与采收率,2011,18(1):18-22.
[10]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):3444.
[11]夏青松,田景春,张锦泉,等.鄂尔多斯盆地陇东地区三叠系延长组长6—长8储层评价及有利区带预测[J].油气地质与采收率,2003,10(4):11-13.
[12]罗静兰,李忠兴,史成恩,等.鄂尔多斯盆地西南部上三叠统延长组长8、长6油层组的沉积体系与物源方向[J].地质通报,2008,27(1):101111.
[13]宋凯,吕建文,杜金良,等.鄂尔多斯盆地中部上三叠统延长组物源方向分析与三角洲沉积体系[J].古地理学报,2002,4(3):59-66.
[14]聂永生,田景春,夏青松,等.鄂尔多斯盆地白豹—姬塬地区上三叠统延长组物源分析[J].油气地质与采收率,2004,11(5):46.
[15]王峰,田景春,张锦泉,等.鄂尔多斯盆地中西部延长组长6油层组物源分析[J].沉积与特提斯地质,2006,26(3):23-30.
[16]韩永林,李健,王海红,等.鄂尔多斯盆地西南缘晚三叠世早期沉积体系分析[J].低渗透油气田,2005,10(4):1-4.
[17]王新民,郭彦如,付金华,等.鄂尔多斯盆地延长组长8段相对高孔渗砂岩储集层的控制因素分析[J].石油勘探与开发,2005,32(2):3538.
[18]卢进才,李玉宏,魏仙样,等.鄂尔多斯盆地三叠系延长组长7油层组油页岩沉积环境与资源潜力研究[J].吉林大学学报:地球科学版,2006,36(6):928-932.
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