白云南洼恩平组海相烃源岩空间展布规律及发育模式
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摘要
通过借助层序地层学理论、构造古地貌分析、古生物资料、沉积速率与可容纳空间关系对比,以及典型地震相识别、地震相与沉积相剖面及平面分析等,结合区域地质资料及前人的研究成果,对白云南洼恩平组烃源岩的叠置关系、影响因素、空间展布规律及发育模式进行了研究,得到如下认识:白云南洼恩平组对应一个完整的二级层序,可细分为3个三级层序,自下至上为SQ1、SQ2、SQ3,海平面总体为上升特征,SQ3的最大海泛面对应了整个恩平组二级层序的最大海泛面;白云南洼恩平组为局限浅海环境,具备发育较好海相烃源岩的条件,稳定半封闭的古构造背景,有利于烃源岩有机质的富集保存;沉积速率小,且小于可容空间增长速率,沉积物向陆退积,沉积水体深度变大,利于海相烃源岩的发育;恩平组烃源岩为大陆边缘半闭塞—欠补偿—湿润海湾模式,优质烃源岩主要发育在受隆起及断层遮挡形成的海湾区。
With the help of sequence stratigraphy,paleogeomorphology,paleontology data,the relationship of sedimentation rate and accommodation space,typical seismic facies,cross sections and spatial analysis of seismic and sedimentary facies,in addition to the regional geological data and previous research achievements,we made a careful research on stratigraphic sequence,influence factors,spatial distribution pattern and depositional model of the source rocks in the south subsag of the Baiyun Sag.It is concluded that while the Enping Formation was deposited,it was a continent marginal,semi-closed and un-compensated moist bay,surrounded by uplifts and faults.The Formation itself consists of a complete second-grade sequence,which can be further subdivided into three third-grade sequences,namely the SQ1,SQ2,SQ3.The maximum flooding surface of the SQ3 coincides with the maximum flooding surface of Enping sequence.As an epicontinetal sea,the south subsag of Baiyun Sag used to have favorable conditions for deposition of high quality marine source rocks,and the rather stable paleotectonic background contributed as well to the enrichment and preservation of organic matters.The sedimentation rate was low then,and even lower than the rate of the increase in accommodation space.As the result,sedimentation retrograded towards land,and water was getting deeper.All the factors lead to a favored environment for accumulation of marine source rocks.
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