Full
GUO Qiheng,born in 1994,is an engineer at Research Institute of Exploration and Development,PetroChina Changqing. He is mainly engaged in petroleum development geology. E-mail: guoqh_cq@petroChina.com.cn.
Outline
The Triassic Yanchang Formation shale oil resources in the Ordos Basin hold significant development potential. Currently,horizontal well designs in the central lacustrine basin,established on the aggradational stratigraphic framework,are plagued by low sandstone encounter rates,creating a critical bottleneck for efficient development of shale oil. Taking the Longdong area of the Ordos Basin as an example,the internal subdivision scheme of the progradational strata was redefined using well logging and seismic data,establishing a unified isochronous progradational stratigraphic framework for the central lacustrine basin. Research has shown that under the combined influence of the collision between the Yangtze and North China blocks during the Indosinian Orogeny and the Carnian Pluvial Episode,the Yanchang Formation exhibits a three-layer architectural style characterized by aggradation-progradation-aggradation stratigraphic architecture. The original Chang 7 to Chang 32 members can be subdivided into 16 progradational sand groups,which prograde sequentially toward the central lacustrine basin. Among these,groups 1-3 exhibit sigmoid progradational filling patterns with low angle,groups 4-6 exhibit sigmoid progradational filling patterns with high angle,while groups 7-16 exhibit oblique-tangential progradational filling patterns. These research findings will provide crucial geological support for the deployment and design of horizontal wells in interbedded shale oil reservoirs in the central lacustrine basin area.
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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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