乌北次洼铜钵庙组箕状断陷湖底扇沉积特征及沉积模式

doi:10.3969/j.issn.1006-6535.2022.02.004

摘要/Abstract

摘要： 海拉尔盆地乌北次洼为西断东超的箕状断陷,发育的陡坡带和缓坡带对沉积、储层展布起控制作用。为落实铜钵庙组Ⅰ油组(TⅠ)上部高产砂体沉积储层特征,明确优质砂体的展布规律,根据岩石相、测井相、地震相特征及粒度分析等,对乌北次洼铜钵庙组Ⅰ油组上部砂体发育的沉积类型、沉积特征及沉积模式进行了系统的研究。研究结果表明,研究区铜钵庙TⅠ上部砂体主要发育湖底扇沉积,通过开展古地貌及物源供给背景及触发机制研究,建立了乌北次洼箕状断陷富砾湖底扇、含砾富砂湖底扇2种沉积模式。铜钵庙晚期强构造运动,陡坡发育受断层活动控制的富砾湖底扇,缓坡发育断层活动和重力作用双重控制的含砾富砂湖底扇。根据现有勘探评价认为,富砾湖底扇为主要的目标区,而含砾富砂湖底扇需要进一步加强成藏认识,进行目标优选。研究成果有效推动了乌北次洼铜钵庙组有利储层的优选及井位部署,通过对2种湖底扇进一步评价优选,预计可落实500×10⁴t储量规模。研究结果对深入铜钵庙组油气勘探及开发具有一定的指导性。

关键词: 沉积模式, 箕状断陷, 富砾湖底扇, 含砾富砂湖底扇, 铜钵庙组, 乌北次洼

Abstract: Urxun Northern Sub-sag in Hailar Basin is a dustpan-shaped fault depression, faulting to the west and overlapping to the east, and the developed steep and gentle slopes control the deposition and reservoir distribution. In order to determine the characteristics of upper high-yield sand body sedimentary reservoirs in Sand Group I (TⅠ) in Tongbomiao Formation and clarify the distribution rules of high-quality sand bodies, a systematic study was conducted on the sedimentary type, sedimentary characteristics and sedimentary model of upper sand body of Oil Group I (TⅠ) in Tongbomiao Formation according to lithofacies, logging facies, seismic facies characteristics, grain size analysis, etc. The results of the study showed that the upper sand body of Tongbomiao TⅠ in the study area was mainly developed with sublacustrine fan deposition, and two sedimentary patterns, namely gravel-rich sublacustrine fan and sand-rich gravel bearing sublacustrine fan, were established through the study of the palaeogeomorphic characteristics, source supply background and triggering mechanism. During the strong tectonic movement in the late period of Tongbomiao Formation, the gravel-rich sublacustrine fan was developed with steep slope and controlled by faulting, while the sand-rich gravel bearing sublacustrine fan was developed with gentle slope and controlled by faulting and gravity. According to the existing exploration evaluation, the gravel-rich sublacustrine fan was considered to be the main target area, and the reservoir accumulation mechanism should be further studied to optimize the targets for the sand-rich gravel bearing sublacustrine fan. The research results have effectively promoted the optimization of favorable reservoirs in the Tongbomiao Formation of Urxun Northern Sub-sag, as well as the deployment of well positions. After further evaluation and optimization of the two types of sublacustrine fans, the available reserve is expected to be 500×10⁴t. There is much for reference of the study results for further oil and gas exploration and development of Tongbomiao Formation.

Key words: sedimentary model, dustpan-shaped fault depression, gravel-rich sublacustrine fan, sand-rich gravel bearing sublacustrine fan, Tongbomiao Formation, Urxun Northern Sub-sag

中图分类号:

TE122.2

南金浩. 乌北次洼铜钵庙组箕状断陷湖底扇沉积特征及沉积模式[J]. 特种油气藏, 2022, 29(2): 24-33.

Nan Jinhao. Sedimentary Characteristics and Models of Sublacustrine Fan in the Skip-shaped Fault Depression of Tongbomiao Formation in Urxun Northern Sub-sag[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 24-33.

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