黄骅坳陷下石盒子组储层特征及溶蚀孔隙成因分析

doi:10.3969/j.issn.1672-9803.2021.04.023

摘要/Abstract

摘要： 黄骅坳陷下石盒子组砂岩储层是有望实现大港探区上古生界找油突破的重点层系,该层系储层非均质性强,勘探开发难度大。通过砂岩薄片与铸体薄片、扫描电镜观察,采用镜质体反射率及毛细管压力综合分析方法,对黄骅坳陷下石盒子组砂岩储层的岩石学特征、储集空间类型、孔隙结构特征进行研究,并探讨了下石盒子组储层溶蚀孔隙的形成机理。下石盒子组储层的储集能力主要来源于粒间溶蚀孔隙,溶蚀作用对下石盒子组储层的改造至关重要,研究表明黄骅坳陷下石盒子组储层溶蚀孔隙主要存在两种类型的形成过程:一是大气淡水淋滤溶蚀,在风化剥蚀面附近,或者地层远端出露地表,溶蚀物容易被带走,留下大块孔隙,主要发育在中部地区,如扣村、北大港地区;二是有机酸溶蚀,经过统计样品发现,下石盒子组储层溶蚀孔隙的形成中有机酸溶蚀占主导地位,主要发育在南部地区,如乌马营、王官屯地区。该研究对黄骅坳陷乃至整个渤海湾盆地二叠系下一步油气藏勘探部署具有一定的指导意义。

关键词: 黄骅坳陷, 下石盒子组, 储层特征, 孔隙结构, 溶蚀作用, 二叠系

Abstract: The sandstone reservoirs of the Lower Shihezi Formation in Huanghua Depression are the key formations expected to achieve breakthroughs in oil prospecting in the Upper Paleozoic in Dagang Exploration Area which are highly heterogeneous and difficult to explore and develop. Through sandstone, cast thin section and scanning electron microscope observation, using comprehensive analysis of vitrinite reflectance and capillary pressure, the petrological characteristics, reservoir space types, and pore structure characteristics of sandstone reservoirs of the Lower Shihezi Formation in Huanghua Depression are studied, and the formation mechanism of dissolved pores in the Lower Shihezi Formation is discussed. The reserve capacity of Lower Shihezi Formation reservoirs mainly comes from intergranular dissolution pores, and dissolution is very important to the reconstruction. Two types of formation processes for dissolved pores in Lower Shihezi Formation in Huanghua Depression are showed. Atmospheric freshwater leaching and dissolution, the dissolution is easily carried away near the weathered and denuded surface, or the exposed surface at the far end of the formation, leaving large pores, which mainly develop in the central area such as Koucun and Beidagang area. According to statistical samples, it is found that organic acid dissolution dominates the formation of dissolution pores in the Lower Shihezi Formation reservoirs, which mainly develop in southern areas such as Wumaying and Wangguantun areas. This study has certain guiding significance for the next step in the exploration and deployment of Permian oil and gas reservoirs in Huanghua Depression and Bohai Bay Basin.

Key words: Huanghua Depression, Lower Shihezi Formation, reservoir characteristics, pore structure, dissolution, Permian System

中图分类号:

TE132.1

张绍辉, 刁丽颖, 吴雪松, 段润梅, 王冠, 邹磊落. 黄骅坳陷下石盒子组储层特征及溶蚀孔隙成因分析[J]. 录井工程, 2021, 32(4): 127-132.

ZHANG Shaohui, DIAO Liying, WU Xuesong, DUAN Runmei, WANG Guan, ZOU Leiluo. Reservoir characteristics of the Lower Shihezi Formation in Huanghua Depression and causes of dissolved pores[J]. Mud Logging Engineering, 2021, 32(4): 127-132.

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