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Objective In geological logs of shale oil cores from the Chang 7 oil member of the Yanchang Formation in the Longdong region， Ordos Basin， for a long time the resolution of single layer thickness of each rock type has been basically 10 cm， resulting in a large number of rock-type combinations being described as a single rock type. Exploring a new method for the quantitative study of shale oil rock-type combinations and reservoir capacity benefits the efficient exploration and development of shale oil in the Chang 7 oil member. Methods In this study， the shale oil rock types in the Chang 7 oil member were re-identified by high-resolution core observation （single layer thickness resolution 1-5 cm） together with stereo microscope and thin-section identification of 405 samples and analysis of physical property data， then the rock-type combinations and reservoir capacity of Chang 7 oil member were explored quantitatively. Results There are 11 main rock types in the shale oil of Chang 7 oil member of the Yanchang Formation in the Longdong region of the Ordos Basin. Firstly， four combinations of rock-type form （unitype， stratified type， interstratified type and interstratified type） and 65 rock-type combinations were quantitatively identified for the first time. Secondly， a new method is proposed for calculating reservoir capacity on the basis of quantitative evaluation of the reservoir capacity of each of the 11 rock types， combined with the thickness percentage of each rock type， for 65 rock-type combinations. Conclusions This study demonstrates that， to guide the efficient exploration and development of the shale oil in the Chang 7 oil member， the traditional single rock-type study for shale oil should be modified to encompass the study of rock-type combinations. However， this research for the Chang 7 oil member is at the exploratory stage； further improvement will be achieved by examining the effect of combining these findings with a large amount of shale oil exploration and development data.
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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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