STUDY OF FORMING CONDITION ON MARINE EXCELLENT SOURCE ROCKS AND ITS EVALUATION

Forming condition of the marine excellent source rocks was studied by the simulation experiment on hydrocarbon generation and expulsion from a mass of different types source rocks and oiliness reservoir rocks,and comparative analysis on geological setting of global large oil and gas field and its marine source rocks.The main forming condition of the marine excellent source rocks form:1)advantage sedimentary environment including intraplatform depression/basin,lagoon,platform slope,anterior border slope and fore reef etc,where have exuberance planktons,tranquilization and deep seawater and reducing environment;2) rich organic matters,total organic carbon content TOC≥2%;3) Ⅰ-Ⅱ type of kerogen;4)paleo-petroleum pool and the dispersed soluble organic matter of the source rocks and reservoir rocks in course of hydrocarbon generation are excellent regenerative gas source during the organic carbon content is large than 0.2%.