渤海海域石臼坨凸起Q油田沙二段储层沉积模式

doi:10.11743/ogg20130410

摘要/Abstract

摘要： 湖相碳酸盐岩与陆源碎屑岩的混合沉积是渤海湾盆地古近系重要的油气储层之一,具有相变快、非均质性强的特点。为了明确该类储层的展布规律,从而更好地服务于油气勘探开发,以渤中凹陷石臼坨凸起Q油田为例,以岩心分析化验、测井和地球物理资料为基础,结合区域构造背景、物源供给、古地貌和古气候等综合分析,对油田沙河街组二段储层的岩石学特征、沉积相及沉积模式展开研究。分析认为,油田沙河街组二段整体处于湖相碳酸盐岩和碎屑岩混合沉积发育的有利背景,可能发育混积及裙带状两种沉积模式。两种模式下的储层连通性均存在一定的风险,在开发过程中应采取相应措施规避风险。此外,混合沉积作用对改善中、深层碎屑岩储层起到积极作用。

关键词: 混合沉积, 沉积模式, 湖相碳酸盐岩, 石臼坨凸起, 渤中凹陷, 渤海湾盆地

Abstract: One of the most important Palaeogene reservoirs in Bohai Bay Basin is of the hybrid lacustrine carbonates and clastics,with frequent facies changes and strong heterogeneities.In order to gain a good insight into the distribution of such reservoirs,Q oilfield in Shijiutuo uplift,Bozhong depression,had been analyzed as an example.Based on core,logging and geophysical data,combined with the analysis on the regional tectonic setting,sediment supply,paleogeomorphological and paleoclimatic data,we studied the petrologic characteristics,sedimentary facies as well as the depositional models of the 2^nd member of Shahejie Formation in Q oilfield.According to this study,the bulk of the 2^nd member of Shahejie Fm of Q oilfield was developed in a depositional setting favorable for the accumulation of hybrid lacustrine carbonate-clastic deposits.Two depositional models,namely the hybrid-deposit model and the skirt-rim model,were proposed.Uncertainty and risk of reservoir connectivity exist in both models,thus corresponding measures should be taken to lower risk during oilfield development.Hybrid-deposition played a positive role in improving the quality of the middle-deep clasitic reservoir.

Key words: hybrid clastic-carbonate deposit, depositional pattern, lacustrine carbonate rock, Shijiutuo Uplift, Bozhong Depression, Bohai Bay Basin

中图分类号:

TE121

倪军娥,孙立春,古莉,等. 渤海海域石臼坨凸起Q油田沙二段储层沉积模式[J]. 石油与天然气地质, 2013, 34(4): 491-498. doi: 10.11743/ogg20130410 Ni Jun'e,Sun Lichun,Gu Li,et al. Depositional patterns of the 2^nd member of the Shahejie Formation in Q oilfield of the Shijiutuo Uplift, Bohai Sea[J]. Oil & Gas Geology, 2013, 34(4): 491-498. doi: 10.11743/ogg20130410

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