Cause of Formation and Dynamic Mechanisms in Multiply  Medium of Dissolved Pores in Deep Formation of Dongying Sag

Key words: 
• dissolved pores /
• multiply medium /
• cause of formation mechanisms /
• dynamical mechanisms /
• deep formation /
• Dongying sag

Abstract: The cause of formation and dynamical mechanisms in multiply medium of dissolved pores in deep formation of Dongying sag were revealed by those means such as core observation, thinsection analysis, scan electricity microscope observation, inclusion analysis and Ro test, etc and combining histories of stratum pressure, tectonic development and organic maturation. It was recognized that the reservoir in deep formation has multiply dissolving mechanisms. They are acidity medium dissolving mechanism and alkalescence medium dissolving mechanism. The former includes organic acid dissolution, abioacid dissolution and dissolution caused by sulfate thermochemistry oxidationreductive reaction and oil field fluid. The later gives priority to quartz dissolution. 6 kinds of methods to recognize quartz dissolution are put forward. The dynamical mechanisms of dissolution include cyclic thermal convection, atmosphere water infiltrating through active faults and exceed pressure leak near the faults.