Revisiting Controls on Shale Oil Accumulation in Saline Lacustrine Basins: The Permian Lucaogou Formation Mixed Rocks, Junggar Basin
| العنوان: | Revisiting Controls on Shale Oil Accumulation in Saline Lacustrine Basins: The Permian Lucaogou Formation Mixed Rocks, Junggar Basin |
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| المؤلفون: | Yuce Wang, Jian Cao, Yang Qin, Wenyao Xiao, Erting Li, Chenjia Zhang |
| المصدر: | Geofluids, Vol 2021 (2021) |
| بيانات النشر: | Hindawi Limited, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | QE1-996.5, Article Subject, Permian, Shale oil, medicine.medical_treatment, medicine, Geochemistry, General Earth and Planetary Sciences, Geology, Structural basin, Saline |
| الوصف: | Fine-grained mixed rocks in saline lacustrine basins are important targets for shale oil exploration. However, the controls on shale oil accumulation are complex due to the multi-source mixed deposition. This is a challenging issue in the study of shale oil. Here, we present a case study in the Middle Permian Lucaogou Formation in the Jimusar Sag, Junggar Basin, northwestern China. Results show that the Lucaogou Formation consists mainly of carbonate rocks, dolomitic or calcareous mudstones, tuffaceous or silty mudstones, and siltstones. The dolomitic/calcareous mudstones ( TO C average = 6.44 wt . % ) and tuffaceous/silty mudstones ( TO C average = 4.83 wt . % ) have the best hydrocarbon generation potential and contain type I–II1 kerogens that are in the peak oil generation stage. However, the shale oil potential is highest for the carbonate rocks and siltstones with average oil saturation index (OSI) values of 315.03 mg HC/g TOC and 343.27 mg HC/g TOC, respectively. This indicates that hydrocarbon generation potential is not the main factor controlling shale oil potential. Micro-nanoscale pores are the main control. Abundant dissolution pores provide excellent reservoir space for near-source migration and accumulation of shale oil. Different mixing processes between lithofacies control the accumulation of shale oil, and shale oil productivity is the best when multi-facies deposition in transitional zones formed the mixed rocks (facies mixing). In addition, local accumulations of calcareous organisms and adjacent carbonate components on terrigenous sediments (in situ mixing) are also conducive to shale oil enrichment. This is an unusual and special feature of saline lacustrine shale oils, which is different from freshwater lacustrine and marine shale oils. Comprehensive assessment of source rock and reservoir is needed to robustly establish a widely applicable method to determine the shale oil potential in such basins. |
| وصف الملف: | text/xhtml |
| تدمد: | 1468-8123 1468-8115 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8973c3662aefce85ef831848c323f163 https://doi.org/10.1155/2021/5206381 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....8973c3662aefce85ef831848c323f163 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14688123 14688115 |
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