This research aims to address the exploration challenges in a gas area of the Sichuan Basin, including multiple target layers, frequent fracture activity, and vertical fluid exchange, diverse periods of migration and accumulation, as well as the complexity of gas-water distribution and pressure systems. By summarizing previous knowledge and exploration achievements, the research focuses on establishing a zonal-scale, multi-layered, three-dimensional geological model of effective reservoirs and migration frameworks, simulating and analyzing the complex migration of oil and gas during different main accumulation periods in various accumulation units and stratigraphic layers, and elucidating the mechanisms and processes of three-dimensional oil and gas accumulation.
Next, through the integration of multi-attribute well logging and seismic analysis at the fine-scale layer level, a reliable method for quantitatively predicting the reservoir-to-seal ratio of each layer in the Dengying Formation in the study area was established.
The simulation analysis focuses on the complex migration of oil and gas during the main accumulation periods in different accumulation units and stratigraphic layers, revealing the three-dimensional mechanisms and processes of oil and gas accumulation. The filling of crude oil is influenced by hydrocarbon supply methods, migration passage distribution, and fracture control. Several favorable areas were selected in the study area, with an area of 1200.66 km² for each favorable area in the Dengying Formation.
Oil Migration Simulation during the first key accumulation period in the Dengying Formation
Simulation of oil cracking into gas and migration during the second key accumulation period in the Dengying Formation .
Simulation of the adjustment and migration of already accumulated gas during the third key accumulation period in the Dengying Formation
Simulation of the re-adjustment and migration of previously accumulated gas during the fourth key accumulation period in the Dengying Formation