鹤山凹陷烃源岩分布特征研究
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摘要
鹤山凹陷地理上位于南海北部陆缘超深水区,地质上属于地壳强烈减薄的洋陆转换带之上,具有高地温梯度、岩石圈韧性变形等不同于陆架区凹陷的特殊地质条件,因而具有特殊的生烃成藏史。采用区域对比的方法,通过层序地层格架、地震相、沉积相等研究,对研究区古近系烃源岩分布特征进行了早期预测,认为在始新世中晚期鹤山凹陷为陆缘断陷湖盆沉积。凹陷中央、控凹断层下降盘局部地区发育沉积厚度较大的中深湖相沉积,具有低频、连续、强振幅、平行-亚平行的地震反射特征,与白云凹陷已钻探证实的湖相烃源岩相似,具有良好的生烃潜力。
Heshan Sag locates in the ultra-deep water area of northern continental margin in South China Sea,on the oceancontinent transition zone with strong crustal thinning.The special geological conditions such as high temperature gradient and lithospheric ductile deformation are different from the depressions which are in continental shelf area,so Heshan Sag has special hydrocarbon accumulation history.Using the method of regional contrast and through the study of sequence stratigraphic framework,seismic facies and sedimentary facies,the distribution characteristics of Paleogene hydrocarbon source rock are predicted early.It is considered that Heshan Sag is a continental margin rift basin deposition in the Eocene period.The thickness of deep lake facies deposition is large in the central part of the sag and the local area of sag-controlling faults downthrown,showing the seismic reflection characteristics of low frequency,continuous,strong amplitude and parallel to subparallel,which are similar to the lake hydrocarbon source rocks drilled and confirmed in Baiyun sag.Therefore,the hydrocarbon source rocks in Heshan Sag have good hydrocarbon potential.
Heshan Sag locates in the ultra-deep water area of northern continental margin in South China Sea,on the oceancontinent transition zone with strong crustal thinning.The special geological conditions such as high temperature gradient and lithospheric ductile deformation are different from the depressions which are in continental shelf area,so Heshan Sag has special hydrocarbon accumulation history.Using the method of regional contrast and through the study of sequence stratigraphic framework,seismic facies and sedimentary facies,the distribution characteristics of Paleogene hydrocarbon source rock are predicted early.It is considered that Heshan Sag is a continental margin rift basin deposition in the Eocene period.The thickness of deep lake facies deposition is large in the central part of the sag and the local area of sag-controlling faults downthrown,showing the seismic reflection characteristics of low frequency,continuous,strong amplitude and parallel to subparallel,which are similar to the lake hydrocarbon source rocks drilled and confirmed in Baiyun sag.Therefore,the hydrocarbon source rocks in Heshan Sag have good hydrocarbon potential.
引文
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[5]禚喜准,谢秀祥,马练军,等.南八仙构造带水文地质演化与异常高压形成机理[J].断块油气田,2011,18(4):413-417.
[6]陈洁,鹿坤,冯英,等.东濮凹陷不同环境烃源岩评价及生排烃特征研究[J].断块油气田,2012,19(1):35-38.
[7]庄新兵,邹华耀,李楠,等.秦南凹陷烃源岩特征与油气勘探新领域[J].断块油气田,2011,18(2):146-149.
[8]吴亚生,钟大康,邱楠生,等.松南地区断陷层烃源岩生烃能力及主控因素分析[J].断块油气田,2012,19(1):39-43
[9]张功成,朱伟林,米立军,等.“源热共控论”:来自南海海域油气田“外油内气”环带有序分布的新认识[J].沉积学报,2010,28(5):987-1005.
[10]郭小文,何生.珠江口盆地番禺低隆起-白云凹陷恩平组烃源岩特征[J].油气地质与采收率,2006,13(1):31-33.
[11]米立军,刘震,张功成,等.南海北部深水区白云凹陷古近系烃源岩的早期预测[J].沉积学报,2007,25(1):139-146.
[12]张义娜,张功成,梁建设,等.琼东南盆地长昌凹陷渐新统崖城组沉积充填及烃源岩特征[J].海洋地质前沿,2012,28(5):7-14.
[13]刘文超,叶加仁,雷闯,等.琼东南盆地乐东凹陷烃源岩热史及成熟史模拟[J].地质科技情报,2011,30(6):110-115.
[14]姚伯初.南海海盆海底扩张年代之探讨[J].南海地质研究,1998:23-33.
[15]庞雄,何敏,朱俊章,等.珠二坳陷湖相烃源岩形成条件分析[J].中国海上油气,2009,21(2):86-94.
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