Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin
The Permian Lucaogou Formation has developed mixed shale reservoirs, but there are few studies on the diagenetic facies, and the control effect of differential diagenesis on the reservoir capacity of shale oil reservoirs in this area is not clear. Therefore, shale samples of the Lucaogou Formation w...
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MDPI AG
2023-01-01
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| Series: | Minerals |
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| author | Ming Xie Wei Yang Mingzhu Zhao Yingyan Li Yuan Deng Yang Gao Changfu Xu Haodong Hou Linjie Yao Zilong Zhang Jiankang Lu |
| author_facet | Ming Xie Wei Yang Mingzhu Zhao Yingyan Li Yuan Deng Yang Gao Changfu Xu Haodong Hou Linjie Yao Zilong Zhang Jiankang Lu |
| author_sort | Ming Xie |
| collection | DOAJ |
| description | The Permian Lucaogou Formation has developed mixed shale reservoirs, but there are few studies on the diagenetic facies, and the control effect of differential diagenesis on the reservoir capacity of shale oil reservoirs in this area is not clear. Therefore, shale samples of the Lucaogou Formation were systematically selected in this study, and through cast thin sections, field emission scanning electron microscopy, XRD mineral analysis, low-temperature nitrogen adsorption and high-pressure mercury injection experiments, the reservoir capacity of the shale oil reservoirs was evaluated from the perspective of diagenetic evolution. The results show that the shale oil reservoir of the Lucaogou Formation in Jimsar Sag is in the middle diagenetic stage A. The diagenetic evolution sequence is compaction—chlorite cementation—silica cementation—first-stage carbonate cementation—first-stage dissolution of authentic albite—illite/smectite mixed layer cementation—second-stage carbonate cementation—second-stage dissolution. The shale reservoirs are divided into five diagenetic facies: tuffaceous–feldspar dissolution facies, mixed cementation dissolution facies, chlorite thin-membrane facies, carbonate cementation facies and mixed cementation compact facies. Among them, the former two diagenetic facies have strong dissolution and weak cementation and are high-quality diagenetic facies, mainly characterized by large pore volume and good pore connectivity, with relatively low <i>D</i><sub>2</sub> values defined as the fractal dimension of mesopores. On the basis of the above research, three different control models of Lucaogou Formation shale oil reservoirs are proposed, including dissolution to increase pores, chlorite cementation to preserve pores, and strong compaction cementation to reduce pores. The quality of reservoirs developed in this model is successively high, medium, and low. This work can provide guidance for the fine characterization and grading evaluation of mixed shale oil reservoirs in saline lake basins and has important theoretical and practical significance for the prediction of shale oil “sweet spot” distribution. |
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| last_indexed | 2024-03-11T08:23:12Z |
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| spelling | doaj.art-7de9734ad15546f98c4cca893b3d36b42023-11-16T22:17:32ZengMDPI AGMinerals2075-163X2023-01-0113214310.3390/min13020143Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine BasinMing Xie0Wei Yang1Mingzhu Zhao2Yingyan Li3Yuan Deng4Yang Gao5Changfu Xu6Haodong Hou7Linjie Yao8Zilong Zhang9Jiankang Lu10State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaPetroChina Jidong Oilfield Company, Tangshan 063000, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Kelamayi 834000, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Kelamayi 834000, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Kelamayi 834000, ChinaResearch Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Kelamayi 834000, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaThe Permian Lucaogou Formation has developed mixed shale reservoirs, but there are few studies on the diagenetic facies, and the control effect of differential diagenesis on the reservoir capacity of shale oil reservoirs in this area is not clear. Therefore, shale samples of the Lucaogou Formation were systematically selected in this study, and through cast thin sections, field emission scanning electron microscopy, XRD mineral analysis, low-temperature nitrogen adsorption and high-pressure mercury injection experiments, the reservoir capacity of the shale oil reservoirs was evaluated from the perspective of diagenetic evolution. The results show that the shale oil reservoir of the Lucaogou Formation in Jimsar Sag is in the middle diagenetic stage A. The diagenetic evolution sequence is compaction—chlorite cementation—silica cementation—first-stage carbonate cementation—first-stage dissolution of authentic albite—illite/smectite mixed layer cementation—second-stage carbonate cementation—second-stage dissolution. The shale reservoirs are divided into five diagenetic facies: tuffaceous–feldspar dissolution facies, mixed cementation dissolution facies, chlorite thin-membrane facies, carbonate cementation facies and mixed cementation compact facies. Among them, the former two diagenetic facies have strong dissolution and weak cementation and are high-quality diagenetic facies, mainly characterized by large pore volume and good pore connectivity, with relatively low <i>D</i><sub>2</sub> values defined as the fractal dimension of mesopores. On the basis of the above research, three different control models of Lucaogou Formation shale oil reservoirs are proposed, including dissolution to increase pores, chlorite cementation to preserve pores, and strong compaction cementation to reduce pores. The quality of reservoirs developed in this model is successively high, medium, and low. This work can provide guidance for the fine characterization and grading evaluation of mixed shale oil reservoirs in saline lake basins and has important theoretical and practical significance for the prediction of shale oil “sweet spot” distribution.https://www.mdpi.com/2075-163X/13/2/143differential diagenesisdiagenetic faciespore structure heterogeneityshale oil reservoirPermian Lucaogou Formation |
| spellingShingle | Ming Xie Wei Yang Mingzhu Zhao Yingyan Li Yuan Deng Yang Gao Changfu Xu Haodong Hou Linjie Yao Zilong Zhang Jiankang Lu Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin Minerals differential diagenesis diagenetic facies pore structure heterogeneity shale oil reservoir Permian Lucaogou Formation |
| title | Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin |
| title_full | Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin |
| title_fullStr | Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin |
| title_full_unstemmed | Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin |
| title_short | Diagenetic Facies Controls on Differential Reservoir-Forming Patterns of Mixed Shale Oil Sequences in the Saline Lacustrine Basin |
| title_sort | diagenetic facies controls on differential reservoir forming patterns of mixed shale oil sequences in the saline lacustrine basin |
| topic | differential diagenesis diagenetic facies pore structure heterogeneity shale oil reservoir Permian Lucaogou Formation |
| url | https://www.mdpi.com/2075-163X/13/2/143 |
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