鄂尔多斯盆地南梁西区延长组层序地层格架与生储盖组合特征
网络出版日期: 2013-09-26
基金资助
国家自然科学基金“鄂尔多斯盆地东西部长6 与长8 致密砂岩埋藏成岩-烃类充注与成藏-储集性能时空演化过程研究”(编号:41272138)、国家重大科技专项“致密含气砂岩的成岩与物性演变过程及其与烃类充注的关系”(编号:2011ZX05008-004-61)与“东西部火山岩储层与鄂尔多斯长6 致密砂岩储层成岩演化序列与有利储层评价”(编号:2011ZX05001-002-008) 联合资助。
Sequence stratigraphic framework and source-reservoir-caprock assemblage of Yanchang Formation in western Nanliang area, Ordos Basin
Online published: 2013-09-26
为研究鄂尔多斯盆地南梁西区上三叠统延长组层序地层格架与生储盖组合特征,采用高分辨率层 序地层学的原理和方法,对该区层序界面类型、层序地层格架特征及长期基准面旋回与生储盖组合的关 系进行了研究。结果表明:研究区共识别出5 个三级层序界面,将延长组划分为1 个超长期和4 个长 期旋回层序;生储盖组合特征与长期基准面旋回的关系密切,在长期基准面上升半旋回早中期和下降半 旋回晚期发育的三角洲平原分流河道及前缘水下分流河道砂体为优质储层,在长期基准面上升半旋回晚
期和下降半旋回早中期发育的浊积岩砂体为潜在储层,在长期基准面旋回升降转换面附近发育的湖相泥 页岩及炭质泥岩为良好的生油层和盖层;延长组发育上生下储、下生上储及自生自储式生储盖组合。
关恒 . 鄂尔多斯盆地南梁西区延长组层序地层格架与生储盖组合特征[J]. 岩性油气藏, 2013 , 25(5) : 49 -58 . DOI: 10.3969/j.issn.1673-8926.2013.05.009
In order to study sequence stratigraphic framework and source-reservoir-caprock assemblage of Upper Triassic Yanchang Formation in western Nanliang area, this paper studied the sequence boundary types, the characteristics of sequence stratigraphic framework, and the relationship between long-term base-level cycle and source-reservoir caprock assemblage by the theory and approach of high resolution sequence stratigraphy. The result shows that five third-order sequence boundaries are identified, the Yanchang Formation consist of four long-term and one super-long term base-level cycles. The source-reservoir-caprock assemblage has close relation to the long-term base-level cycle. The sand bodies of delta plain distributary channel and front underwater distributary channel developed in the early middle stage of the uprising periods and middle-late stage of subsiding periods are high quality reservoir, the turbidite sand bodies developed in the middle-late stage of the uprising periods and early-middle stage of subsiding periods are potential reservoir, and the lacustrine shale and carbon mudstone developed in the surrounding of transforming interface of uprising to subsiding of the long-term base-level cycle. The Yanchang Formation developed three types of source-reservoir-caprock assemblage, including upper-sourcing and lower-reservoir type and lower-sourcing and upper reservoir type and self-sourcing and self-reservoir type.
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