A New Methodology Combining Geophysical Calculations and Geological Analysis to Identify and Characterize Carrier Systems for Vertical Hydrocarbon Migration in the Central Diapir Zone of the Yinggehai Basin, China

To understand hydrocarbon migration in terms of the mechanisms, accumulations and exploration targets, it is essential to correctly identify characterize carrier systems that control fluid-migration history oil/gas reservoir formation. The Yinggehai Basin China an important area for natural gas production. However, due argillaceous sand sedimentary environment absence faults from Neogene thermal subsidence period, traditional pathways are absent Basin, posing significant challenges target evaluation this area. Exploration shows most existing reservoirs associated with vertical migration. In work, coherence cube curvature seismic techniques used central diapir zone diapir-associated fractures regional stress. Together geological analysis, two categories system discussed detail explain complex accumulation patterns have puzzled Diapirs five evolutionary phases, i.e., pressurization, piercing, equilibrium, release collapse, which different fracture development patterns, leading mechanisms accumulation. carbon isotopes gaseous hydrocarbons DF shallow layers mid-deep inverted order distribution, indicating mixed maturity, whereas diapir-affected areas, there a single low maturity. Early diapiric activity allowed produced deep source rocks migrate upward along accumulate suitable traps form reservoirs. For regional-stress related fractures, gradual loss overpressure fluids high-pressure results time stress-related being relatively late early.