Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China,Geological Journal

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Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China
Geological Journal ( IF 1.4 ) Pub Date : 2022-08-04 , DOI: 10.1002/gj.4561
Tao Ye _{1,

2,

3} , Anqing Chen _{1,

2} , Chengming Niu ₃ , Jian Luo _{1,

2} , Mingcai Hou _{1,

2}

Affiliation

A set of marine carbonates was deposited in the Palaeozoic of the North China Craton, which is the dominant sequence for buried hill hydrocarbon exploration. This study focuses on the lithofacies and reservoirs developed in the sequence. Based on the data of cores, thin sections, drilling, and logging, the characteristics of the sequence stratigraphic framework and its control on lithofacies and reservoirs of the Lower Palaeozoic buried hills in the offshore Bohai Bay Basin are discussed. The results show that there developed 4 second-order sequences and 21 third-order sequences in the study area. Due to the deep burial depth, the dolomite is more likely to form high-quality reservoirs than limestone in the study area, and we define the dolomitic tidal flat-dominant sequences as ‘favorable reservoir sequences’. There developed unconformity-related reservoirs and inner reservoirs in the buried hill, and the ‘favourable reservoir sequences’ present obvious control on both reservoirs, showing: (i) ‘favourable reservoir sequences’ and weathering interface control on the scale of the unconformity-related reservoir jointly, and (ii) the inner reservoirs developed within ‘favourable reservoir sequences’ as well, and the top and bottom of the high-frequency sequences are the predominant areas for the bedding karst reservoir distribution.

中文翻译：

渤海湾盆地近海下古生界碳酸盐岩层序地层格架岩相储集层

华北克拉通古生界沉积了一套海相碳酸盐岩，是潜山油气勘探的优势层序。本研究重点关注层序发育的岩相和储层。以岩心、薄片、钻井、测井资料为基础，探讨了渤海湾盆地近海下古生界潜山层序地层格架特征及其对岩相储层的控制。结果表明，研究区发育二级层序4个，三级层序21个。由于埋深较深，研究区白云岩比石灰岩更容易形成优质储层，我们将白云质潮坪优势层序定义为“有利储层层序”。

更新日期：2022-08-04

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