[en] This paper will focus on the parallelization of ocean model with explicit scheme which is one of the most commonly used schemes in the discretization of governing equation of ocean model. The characteristic of explicit schema is that calculation is simple, and that the value of the given grid point of ocean model depends on the grid point at the previous time step, which means that one doesn’t need to solve sparse linear equations in the process of solving the governing equation of the ocean model. Aiming at characteristics of the explicit scheme, this paper designs a parallel algorithm named halo cells update with tiny modification of original ocean model and little change of space step and time step of the original ocean model, which can parallelize ocean model by designing transmission module between sub-domains. This paper takes the GRGO for an example to implement the parallelization of GRGO (Global Reduced Gravity Ocean model) with halo update. The result demonstrates that the higher speedup can be achieved at different problem size. (paper)

[en] A suite of lacustrine mixed marlstone is developed in the lower third member of the Shahejie Formation (Es3^l) in the Shulu Sag, Bohai Bay Basin, and it is a tight oil reservoir which acts as both source bed and reservoir bed. According to the rock fabric characteristics, the marlstone in Es3^l can be divided into two types: lamellar marlstone (stratigraphically mixed) and massive marl (structurally mixed). Both of them contain minerals dominated by calcite, followed by dolomite, and minor quartz, feldspar and clay minerals. The marlstone in Es3l is a typical ultra-low porosity and ultra-low permeability tight reservoir. Its pore space is classified into two types and eight sub-types, and the matrix pores are mainly nano-scale pores. The lamellar marlstone reservoir shows better physical properties and pore structure than the massive marlstone reservoir. Both the chloroform asphalt “A” content and rock pyrolysis S0+S1 are high, and oil-bearing is universally observed. The development of “sweet spot” is jointly controlled by sedimentary facies, rock fabric, organic matter abundance and maturity, structural fractures. (paper)