The FEM Simulating Of Hydrocarbon Migration In Dongying Depression

The research on hydrocarbon migration is not only playing important role in the basin evolution, but also one of the latest subject in geology of petroleum. A coupled hydrocarbon migration model for Dongying depression, based on lots of field data, tectonic geology, and continuum theory, has been developed in this paper. Then a series of numerical simulating on hydrocarbon migration and accumulation, and relevant evaluation of in-situ stress for Dongying depression was presented. The main contents are summarized as follow:(1) Some comprehensive mechanical analytics, combined with the tectonic background of Dongying depression, were used to depict the role of in-situ stress, and fault connectivity in hydrocarbon migration. The further relationship between fault connectivity and the fault strike, fault normal stress, was elucidated.(2) According to geology, continuum theory, a coupled hydrocarbon migration model for Dongying depression has been developed. The Galerkin finite element method with full implicit and sequential iterative algorithm has been used to devise a FEM code.(3) Focus on Dongying depression and Qingnan sub-depression, a series of FEM simulating figures show the in-situ stress pattern, and the main periods of hydrocarbon expulsion segments since 20 Ma. So the corresponding tendency of formation instabilities, predicated by Drucker-Prager criteria and critical pressure limits determined by hydraulic fracture test, may be benefit to reconstruct hydrocarbon migration history of Dongying depression.