Full
XIN Jiayan,born in 1998,is a master degree candidate. Her main research direction is reservoir geology. E-mail: 2308413183@qq.com.
Outline
To investigate the pore structure characteristics of the shale oil reservoir in the Jurassic Da’anzhai Member in Longgang area,northern Sichuan Basin,a systematic analysis of pore features and their controlling factors in the Da’anzhai shale was conducted using organic carbon analysis,field emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),nitrogen adsorption,and nuclear magnetic resonance(NMR)experiments. The results indicate that: (1)The pore types in the Da’anzhai shale oil reservoir are dominated by clay mineral intercrystalline pores,followed by calcite intercrystalline pores,quartz intercrystalline pores,with minor organic matter pores and pyrite intercrystalline pores. (2)Clay content controls the pore volume and specific surface area of the shale,while organic matter content has minimal influence on porosity. (3)Calcite intercrystalline pores primarily contribute to larger pores but are limited in number and volume. Microscopically,these pores are mainly found within biogenic shells,with the shell edges being dense and non-porous. The low degree of asphalt filling and poor connectivity are notable. The development of calcite intercrystalline pores is controlled by shell recrystallization,with larger shells being more prone to recrystallization and forming intercrystalline porosity. (4)Authigenic quartz intercrystalline pores are distributed along shell edges,exhibiting better connectivity than calcite intercrystalline pores. These pores formed earlier than the hydrocarbon generation stage of organic matter and are often filled with hydrocarbons,contributing significantly to effective storage space. Their development is controlled by the degree of silicification of shells,with larger shells more susceptible to replacement,forming quartz intercrystalline pores. (5)The mixing of clay and shells results in a distinct “binary” structure in the reservoir space: clay-rich areas are characterized by pores with high specific surface area,small pore size,and good adsorption capacity,while shell-rich areas are dominated by pores with low specific surface area,large pore size,but limited connectivity.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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