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川东南地区长兴组层序地层与沉积相特征 被引量:17

Sequence stratigraphy and sedimentary facies characteristics of Changxing Formation in southeastern Sichuan Basin
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摘要 文中以Vail的经典层序地层学为指导,采用野外露头、岩心及测井等多种分析手段,通过对层序界面、相序、叠置结构、测井曲线等标志的综合识别分析,将川东南地区长兴组划分为2个三级层序。在长兴组三级层序格架剖面建立的基础上,进一步研究川东南地区长兴组层序格架内沉积相垂向及横向的分布情况,揭示了该地区长兴组沉积相在垂向及横向上均能进行较好的对比,且其厚度变化不大的规律。在此基础上,从层序演化的角度研究了长兴组沉积时期礁滩相的发育分布情况,结果表明,礁滩相及潮坪相主要发育在2个三级层序的高水位体系域时期,海侵体系域时期只有上层序发育一定规模的礁滩相,但发育规模较小。研究成果对川东南地区下一步的油气勘探具有重要的指导意义。 Based on the theory of classical sequence stratigraphy by Vail and the analyses of field outcrop, core and well-logging data, Changxing Formation can be divided into two third-order sequences in southeastern Siehuan Basin through the analyses of sequence surfaces, facies sequence, stacking pattern, well-logging curve. Furthermore, on the basis of the establishment of third-order sequence framework in Changxing Formation, the vertical and lateral distribution of sedimentary facies in Changxing Formation, which is within the sequence framework of Changxing Formation, is studied in the area. The law that the vertical correlation and lateral correlation can be conducted and the change of the thickness is not great in sedimentary facies of Changxing Formation has been revealed. The development and distribution of reef fiat facies during the sedimentary stage of Changxing Formation are analyzed from the respect of sequence evolution, which reveals the rules that the reef flat facies and tidal fiat facies developed in the high stand systems tract of two third-order sequences and that the upper third-order sequence developed the reef flat facies of a certain size during transgressive systems tract stage. The rules above have an important sense for the further petroleum exploration of the southeastern area of Sichuan Basin.
出处 《断块油气田》 CAS 北大核心 2011年第6期722-725,共4页 Fault-Block Oil & Gas Field
基金 国家油气重大专项"大型油气田及煤层气开发"课题"海相碳酸盐岩层系优质储层分布与保存条件评价"(2008ZX05005-002-008HZ)
关键词 层序地层 沉积相特征 长兴组 川东南地区 sequence stratigraphy characteristics of sedimentary facies Changxing Formation southeastern Sichuan Basin
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