塔里木盆地北部寒武系大型进积型台地—斜坡地震层序、演化与控制因素
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国家重点基础研究发展计划(973计划),国家科技重大专项


Seismic Sequences, Evolution and Control Factors of Large Cambrian Progradational Platform Slope System in the Northern Tarim Basin, Northwest China
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    摘要:

    以塔里木盆地北部塔河油田重复采集的高精度三维资料为基础,综合常规的三维资料和钻井资料进行解释,针对寒武系台地-斜坡沉积体系的地震层序、样式、演化与控制因素,讨论台地的起源、不整合面形成环境和海相烃源岩。在塔河油田寒武系地层中识别出16个地震层序。其中,编号为SQ6、SQ7和SQ11的地震层序发育在低位体系域,其他层序由海进和高位体系域组成,具有快速海进、缓慢海退的不对称旋回特征。塔河油田寒武系碳酸盐岩台地总体表现出纵向加积、向东超覆、台地边缘依次向东迁移的大型进积型台地特征,台地边缘向东迁移的距离超过40km。塔河油田寒武系碳酸盐岩台地起源于塔中隆起的北斜坡,经历了缓坡、平顶陆棚、镶边陆棚等台地样式的演化。沉积底形、相对海平面变化、拉张活动、基底沉降和古气候在不同演化阶段起到不同的控制作用,古气候和风向对中—晚寒武世镶边陆棚的发育具有明显的控制作用。下寒武统肖尔布拉克组顶面和寒武系顶面发育区域不整合面,中寒武统沙依里克组和阿瓦塔格组顶面在陆棚边缘发育不整合面,这些不整合面形成于拉张环境。塔河油田寒武系海相烃源岩发育良好,分布广泛,尤其是玉尔吐斯组全区分布,吾松格尔组、阿瓦塔格组和上寒武统的斜坡-盆地相烃源岩分布在塔河东部地区。

    Abstract:

    With the objective of understanding the seismic sequences, styles, evolution and control factors of Cambrian platform slope system in the Tahe oilfield, northern Tarim, this study discusses the origin of platform, forming environment of unconformities, and marine source rocks using high precision three dimensional (3D) seismic data of secondly acquisition and comprehensive interpretation of the conventional 3D seismic and drilling data. Sixteen seismic sequences have been identified in the Tahe oilfield. SQ6, SQ7 and SQ11 are developed with LST, and other sequences consist of TST and HST, characterized by asymmetrical cycles with quick transgression and slow regression. Cambrian carbonate platform in the Tahe oilfield generally presents a large progradational platform with features of longitudinal aggradation, eastward overlap and eastward migration of platform margins successively. The platform margin migrated more than 40 kilometers from west to east. Cambrian carbonate platform originated from the north slope of the Tazhong uplift, experiencing the evolution of ramp, flat topped shelf and rimmed shelf platform. Initial topography, relative sea level changes, extension activities, basement subsidences and paleoclimate played different control roles in different evolution stages, and paleoclimate and wind direction also played remarkable control role in the development of Middle Late Cambrian rimmed shelf.Regional unconformities were developed within the top surfaces between Xiaoerbulak Fm. and Cambrian, and also in the shelf edges of middle Cambrain Shayilik Fm. and Awatag Fm. in Middle Cambrian, respectively. All these unconformities formed in a tensional environment. The Cambrian marine hydrocarbon source rocks in the Tahe oilfield are well developed, especially with the Yuertus Formation distributed throughout the region, and the slope basin source rocks of Wusongger Fm., Awatag Fm. and Upper Cambrian are distributed in the eastern Tahe oilfield.

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刘存革,李国蓉,罗鹏,王明,罗明霞,刘永立.2016.塔里木盆地北部寒武系大型进积型台地—斜坡地震层序、演化与控制因素[J].地质学报,90(4):669-687.
LIU Cunge, LI Guorong, LUO Peng, WANG Ming, LUO Mingxia, LIU Yongli.2016. Seismic Sequences, Evolution and Control Factors of Large Cambrian Progradational Platform Slope System in the Northern Tarim Basin, Northwest China[J]. Acta Geologica Sinica,90(4):669-687.

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  • 收稿日期:2014-11-15
  • 最后修改日期:2015-05-24
  • 录用日期:2016-04-26
  • 在线发布日期: 2016-04-26
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