吐哈盆地中二叠统—三叠系高分辨层序地层学分析
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摘要
以高分辨层序地层学理论为指导,应用岩心、钻/测井和地震等多种资料,建立了吐哈盆地中二叠统一三叠系基准面旋回的识别标志,将吐哈盆地中二叠统一三叠系划分为四个基准面旋回(层序)。在此基础上,研究了等时地层格架内沉积体系的分布。综合分析认为构造作用是控制本区基准面旋回形成的主要因素。多种资料证明吐哈盆地中二叠统一三叠系发育了简单前陆、双前陆和背驮式前陆三类沉积凹陷;缓坡和陡坡型两类沉积模式。根据层序发育特征吐哈盆地中二叠统一三叠系生储盖层发育广泛。其中基准面下降期早期是烃源岩的主要形成时期,基准面上升期形成的下储上盖型组合是盆地最有利的储盖配置关系,因而作为接替层系中二叠统一三叠系勘探潜力巨大。
Two kinds of lake basin, blind and open, two types of sequence, structure and climate were identified through analysis of major factors controlling the deep datum cycle in Tuha basin according to the high resolution sequence stratigraphy. The authors inferred that there were three kinds of sedimentary sags, two sorts of sedimentary mode, ie ramp and steep slope, three kinds of source - reservoir - caprock assemblage in the middle - Permian to lowerJurassic formation in Tuha basin. Among them, the reservoir - under - cap assemblage formed during the uplift period of the datum was the most promising target with great exploration prospect.
Two kinds of lake basin, blind and open, two types of sequence, structure and climate were identified through analysis of major factors controlling the deep datum cycle in Tuha basin according to the high resolution sequence stratigraphy. The authors inferred that there were three kinds of sedimentary sags, two sorts of sedimentary mode, ie ramp and steep slope, three kinds of source - reservoir - caprock assemblage in the middle - Permian to lowerJurassic formation in Tuha basin. Among them, the reservoir - under - cap assemblage formed during the uplift period of the datum was the most promising target with great exploration prospect.
引文
[1] 邓宏文.高分辨层序地层学-在石油勘探开发中的应用.北京:中国地质大学,2002,5．
[2] 张万选,张厚福等.陆相地震地层学.北京:石油工业出版社,1993,2．
[3] 中国石油天然气集团公司油气储层重点实验室编.陆相层序地层学应用指南.北京:石油工业出版社,2002,6．
[4] 陈发景.前陆(或挠曲)盆地分析.北京:中国地质大学,1992,10．
[2] 张万选,张厚福等.陆相地震地层学.北京:石油工业出版社,1993,2．
[3] 中国石油天然气集团公司油气储层重点实验室编.陆相层序地层学应用指南.北京:石油工业出版社,2002,6．
[4] 陈发景.前陆(或挠曲)盆地分析.北京:中国地质大学,1992,10．
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