生物扰动油气水储层的研究现状及展望【纪念专刊】
- 收稿日期:
2023-07-12
- 网络出版日期:
2023-09-16
摘要: 生物扰动通过改变原生沉积组构使岩石物理性质发生变化，降低或提高原生地层的孔隙度和渗透率，进而影响储层岩石物性和流体流动特征。本文综述了生物扰动油气水储层的储集空间类型、孔隙结构特征、储层介质类型、流体传输特征、储层类型及其属性特征等。生物扰动油气水储层的储集空间类型包括：原生粒间孔、粒内溶孔、粒间溶孔和晶间孔等。根据生物潜穴和围岩基质的渗透率关系可以将生物扰动储层划分为双孔隙度生物成因储层介质和双渗透率生物成因储层介质，两类储层介质生物潜穴类型、运移动力、流体传输特征、沉积环境等存在不同程度的差异；根据生物扰动储层的生物潜穴特征、储层介质类型和储层岩石物性特征，目前可划分为界面控制的生物扰动储层、非界面控制的生物扰动储层、边界不清晰的生物扰动储层、隐蔽性生物扰动储层、成岩成因的生物扰动储层五种类型，并详细分析了影响生物扰动储层岩石物性的主控因素，包括潜穴充填物和基质渗透率比、生物扰动强度和连通性、生物潜穴表面积、潜穴的构型特征。目前，对于生物扰动储层的地球物理识别、油藏描述和储层建模等尚处于初级研究阶段，但可预见的是加强生物扰动油气水储层的研究对丰富储层地质学理论，实现油气增储、上产和提高采收率具有重要意义。
A Review and Perspective of Bioturbated Hydrocarbon and Water Reservoirs
- Received Date:
2023-07-12
- Available Online:
2023-09-16
Abstract: Bioturbation changes the petrophysical properties of host rocks by changing the primary sedimentary fabric, decreasing or increasing the porosity and permeability of the primary formation, which in turn affects the reservoir properties and fluid flow characteristics. This paper reviews the reservoir space types, pore structure characteristics, reservoir media nature, fluid transport characteristics, reservoir types and their property characteristics of bioturbated hydrocarbon and water reservoirs. The reservoir space types of bioturbated reservoirs include: primary intergranular pores, intra-grain dissolved pores, inter-grain dissolved pores and intergranular pores. According to the relationship between the permeability of burrows and the host sediments, the bioturbated reservoir can be divided into dual-porosity biogenic reservoir media and dual-permeability biogenic reservoir media, and the two types of reservoir media have significant difference in burrow types, migration dynamics, fluid transport characteristics, and depositional environment; according to the burrow characteristics of bioturbated reservoir, fluid transport characteristics in reservoir media and reservoir petrophysical characteristics, bioturbated reservoirs can be divided into five types: (1) Surface-constrained bioturbated reservoirs, (2) Non-surface-constrained bioturbated reservoirs, (3) Weakly defined bioturbated reservoirs, (4) Cryptic bioturbated reservoirs, and (5) Diagenetic bioturbated reservoirs. The main controlling factors affecting the petroproperties of bioturbated reservoirs are analyzed in detail, including the permeability ratio of burrow-fills and hosting matrix, bioturbation intensity and connectivity, burrow-surface area, and burrow architecture. At present, the geophysical identification, reservoir description and reservoir modeling of bioturbated reservoirs are still at the pilot investigation stage, but it is foreseeable that strengthening the study of bioturbated hydrocarbon and water reservoirs is of great significance and important implications for enriching the theory of reservoir geology, increasing oil and gas storage, enhancing production and recovery.
点击查看大图
下载:
