塔里木盆地中东部地区寒武系-奥陶系地震相分析与解释
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摘要
塔东地区寒武、奥陶系为有效的烃源岩及储层,为研究目的层系。经塔东2井等VSP测井资料标定Tg3、Tg5、Tg5′及Tg6标注层,对地震层序进行地震相的识别和划分。对塔东寒武、奥陶系海相碳酸盐盆地沉积划分8种地震相:开阔台地相(KT)、台地边缘相(TY)、礁滩相(JT)、台缘斜坡相(QX)、陆棚相(LP)、盆底扇相(SH)、盆地相(PN)和浊积扇相(ZS)。在建立地震相带的基础上,编绘了地震相平面图,结合钻井地质及周边地质露头作了沉积相转换,可以看到塔东地区寒武-奥陶系有完整的海相碳酸盐盆地沉积序列,沉积中心位于满加尔凹陷西部。盆地东西部的台缘斜坡带特征有所差异。
The Cambrian-Ordovician system is the effective source rock and container rock in the east Tarim area,and it's the target stratum.After VSP well logging materiel of well Tadong2 etc.demarcating Tg3、Tg5、Tg5′and Tg6 marker bands,we identified and compartmentalized the seismic facies of the seismic sequence.The marine carbonate basin sediments of Cambrian-Ordovician system in the east Tarim can be compartmentalized to 8 seismic facices: wide mesa face(KT)、mesa edge face(TY)、shoal reef face(JT)、edge slope face(QX)、continental shelf face(LP)、basin floor fan face(SH)、basin face(PN) and turbidite fan(ZS).Based on the set of the seismic facies bands,we completed seismic facies plans,and combined with the well geology and outcrop geology of neighbouring areas, we convert them to sedimentary facies plans,from which we can recognize that the Cambrian-Ordovician system in the east Tarim has complete marine carbonate basin sediments sequences,and the semimetal center locates in the west Majiaer seg,and the east and west edge slope bands of the basin has several different.
The Cambrian-Ordovician system is the effective source rock and container rock in the east Tarim area,and it's the target stratum.After VSP well logging materiel of well Tadong2 etc.demarcating Tg3、Tg5、Tg5′and Tg6 marker bands,we identified and compartmentalized the seismic facies of the seismic sequence.The marine carbonate basin sediments of Cambrian-Ordovician system in the east Tarim can be compartmentalized to 8 seismic facices: wide mesa face(KT)、mesa edge face(TY)、shoal reef face(JT)、edge slope face(QX)、continental shelf face(LP)、basin floor fan face(SH)、basin face(PN) and turbidite fan(ZS).Based on the set of the seismic facies bands,we completed seismic facies plans,and combined with the well geology and outcrop geology of neighbouring areas, we convert them to sedimentary facies plans,from which we can recognize that the Cambrian-Ordovician system in the east Tarim has complete marine carbonate basin sediments sequences,and the semimetal center locates in the west Majiaer seg,and the east and west edge slope bands of the basin has several different.
引文
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[2]钟广法,刘学锋,邓常念,万里皋.塔里木盆地塔东凸起西部中上奥陶统地震层序与海底扇沉积.地球科学——中国地质大学学报,2006,31(3):366~371.
[3]邹才能,张颖等.油气勘探开发实用地震新技术.北京:石油工业出版社,2002.9.
[4]张师本,黄智斌,朱怀诚.塔里木盆地覆盖区显生宙地层.北京:石油工业出版社,2004.1.
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