It refers to the combination of source rock, oil generation period and reservoir in time and space. Taking Sinian-Cambrian-Ordovician as the main oil source rock, the generated oil and gas are accumulated in multi-stage oil and gas reservoirs, forming various models:
1) Paleozoic ancient oil reservoir. Oil and gas generated in Paleozoic are stored in Paleozoic strata (Shaxi No.2 Ordovician insider oil and gas reservoir).
2) epigenetic ancient storage. The oil and gas generated in Himalayan period are stored in Paleozoic strata (Yakela Lower Paleozoic condensate gas field).
3) Epigenetic storage. The oil and gas reservoirs generated in Himalayan period are in Mesozoic strata (Akkule Triassic oil and gas reservoirs).
4) Epigenetic new storage. The oil and gas generated in Himalayan period are stored in Cenozoic (oil and gas of Suweiyi Formation in Yakela Structure).
According to the factors of reservoir-forming period and later reconstruction, it can be divided into the following four types.
1) Early reservoir-forming types: For example, Aiding Area 4 in Tahe Oilfield in Tabei was formed by early reservoir-forming in Variscan.
2) Early cracking reservoir-forming type: Hetianhe gas field in Tarim Basin.
3) Late reservoir-forming types: Sichuan Puguang gas field, Tarim Yakela oil and gas field and Ordos basin gas field.
4) Multi-stage aggregation type: Tahe 3 ~ 4 area in Tarim Basin.
(2) Multi-oil and gas field model
Refers to the combination of single or multiple types of oil and gas reservoirs, which can be divided into:
1) Single structure: such as the carboniferous oil and gas field in Bashituo, Tarim Basin.
2) Double-layer structure: for example, Yakela condensate gas field, with fault-block buried hill condensate gas reservoir in Lower Paleozoic and gentle anticline condensate gas reservoir in Mesozoic.
3) Multilayer structure: Akkule oil and gas field, with Ordovician unconformity reservoir at the bottom, Carboniferous lithologic reservoir in the middle and Triassic drape anticline reservoir at the top.