Characteristics and vertical zonation of large‐scale granitic reservoirs, a case study from Penglai oil field in the Bohai Bay Basin, North China,Geological Journal

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Characteristics and vertical zonation of large‐scale granitic reservoirs, a case study from Penglai oil field in the Bohai Bay Basin, North China
Geological Journal ( IF 1.4 ) Pub Date : 2020-08-02 , DOI: 10.1002/gj.3932
Tao Ye _{1,

2,

3} , Anqing Chen _{1,

2} , Chengmin Niu ₃ , Qingbin Wang ₃ , Longlong Guo _{1,

2,

3}

Affiliation

Primary pores are undeveloped in the granite, but multiple types of reservoir spaces can form during the processes of weathering and tectonic movement. Taking Penglai (PL) oil field as an example, the vertical zonal characteristic of the buried granite is defined and the relationship between different zones and reservoir is discussed. The granite can be divided into weathered zone (WZ) and bedrock zone (BZ) vertically according to weathered or not, and the WZ can be divided into weathered clay zone (WCZ), weathered glutenite zone (WGZ), and weathered fracture zone (WFZ) further. The lithology, mineral composition, and weathering indices (geochemistry) can distinguish different zones. Both WZ and BZ can form good reservoirs, among them the reservoir of WGZ is dominated by pores, while that of WFZ and the BZ are mainly composed of fractures, and they constitute the high‐quality reservoir together. There is an obvious positive correlation between the thickness of fracture zone in BZ and the thickness of WZ, and both WZ and BZ are influenced by tectonic movement. Moreover, WZ superimposed with meteoric water dissolution makes it the best reservoir in the granitic buried hill, and the development of fractures in BZ extends the thickness of reservoir greatly.

中文翻译：

大型花岗岩储层特征与垂直分区研究-以华北渤海湾盆地蓬莱油田为例

花岗岩中未发育初级孔隙，但在风化和构造运动过程中会形成多种类型的储集空间。以蓬莱（PL）油田为例，定义了埋藏花岗岩的垂直带状特征，并探讨了不同区域与储层之间的关系。根据风化与否，可将花岗岩垂直划分为风化带（WZ）和基岩带（BZ），而WZ则可分为风化黏土区（WCZ），风化戊二石区（WGZ）和风化断裂区（ WFZ）。岩性，矿物组成和风化指数（地球化学）可以区分不同的区域。WZ和BZ均可形成良好的储层，其中WGZ的储层以孔隙为主，而WFZ和BZ的储层主要由裂缝构成，它们共同构成了高质量的水库。BZ断裂带的厚度与WZ的厚度之间存在明显的正相关，并且WZ和BZ都受构造运动的影响。此外，WZ叠加有水溶作用使它成为花岗埋山中最好的储层，而BZ裂缝的发展大大扩展了储层的厚度。

更新日期：2020-08-02

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