变质岩潜山储层垂向分带及其特征——以渤中19-6构造为例
Vertical Reservoir Units and Characteristics of Metamorphic Buried Hill: An Example from Bozhong19-6 Structure in Bohai Bay Basin, East China
渤中19-6构造变质岩潜山大型凝析气田勘探的成功,推动了渤海湾盆地潜山油气勘探的新进程。为了进一步明确研究区变质岩潜山油气储层类型和特征,本文综合利用多种地质、测井和录井资料等,从岩性、测井曲线特征、裂缝发育情况、元素—矿物变化规律、储层类型等多角度对变质岩潜山开展研究。研究表明:研究区变质岩潜山垂向上可依据电阻率曲线均值突增、声波曲线由指形和齿化箱形组合转变为微齿化、裂缝由较宽的网状裂缝转变为产状较为一致的微裂缝等划分出风化壳带和潜山内幕带两个一级垂向结构单元。进一步可根据风化作用特征、元素-矿物演化、测井曲线形态变化、孔隙-裂缝发育程度等,将风化壳带细分为黏土带(研究区不发育)、风化砂砾岩带、淋蚀带和崩解带4种二级结构单元;将潜山内幕带细分为内幕裂缝带和致密带2种二级结构单元,并建立了渤中19-6构造变质岩潜山储层分布模式。储集空间类型和物性特征研究表明,研究区变质岩潜山最有利储层主要为风化砂砾岩带的孔隙型储层、裂缝-孔隙型储层以及潜山内幕裂缝带的裂缝型储层,其次是淋蚀带和崩解带的裂缝-孔隙型、孔隙-裂缝型储层。
The successful of the large condensate gas field in the metamorphic buried hill of Bozhong 19-6 structure has advanced the new phase of buried hill hydrocarbon exploration in the Bohai Bay Basin. To clarify the types and characteristics of the metamorphic buried hill reservoir in further, this study comprehensively utilizes various geological data, well logging curves, and log data to conduct a reservoir study from multiple perspectives, including lithology, well logging curves response characteristics, fracture development, elements-minerals variation patterns, and reservoir types. The result shows that the metamorphic buried hill in Bozhong 19-6 structure can be divided into weathering crust belt and buried hill interior belt in vertical. Those two first-order vertical units can be identified based on a sudden increase in the mean value of the resistivity curves, a transition of the acoustic curves from a combination of finger-shaped and serrated box-shaped to a micro-serrated pattern, and a change from relatively wide network-like fractures to micro-fractures in relatively consistent occurrence. Furthermore, based on the weathering degree features, elements-minerals evolution, variations in well logging curves, and the development degree of pores and fractures, the weathering crust belt is subdivided into clay zone(undeveloped in study area), weathered conglomerate zone, leaching zone, and disintegration zone. And the buried hill interior belt is subdivided into interior fracture zone and the tight zone. A reservoir development model for the metamorphic buried hill in the Bozhong 19-6 structure is established. This study also indicates that the favorable reservoirs in metamorphic buried hill in study area are primarily the pore-type and some fracture-pore type reservoirs in the weathered conglomerate zone, and the fracture-type reservoirs in the interior fracture zone. And the secondary preferred reservoirs are pore-fracture type and fracture-pore type reservoirs in leaching zone, as well as the disintegration zone.
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国家自然科学基金项目(41702116)
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