Evaluation on High-quality Source Rock, Liaozhong Depression

Oil and gas are generated from organic matter in source rock.Therefore,organic-matter abundance,type and maturity can determine hydrocarbon-generating potential.With the biggest potential in Liaodong Bay,the Liaozhong Depression is rich enough to be commercially exploited.For source rock in this depression,its geochemical characteristics are evaluated by some analysis,including organic-matter content,pyrolysis,microscopy,and vitrinite reflection ratio.Results show that(1)there are three suites of formation from moderate to good,including Sha 1,Sha 3 and Dong 3 members(;2)the best source rock accounts for 70 % of total rock samples(;3)the main organic-matter types contain II1 and II2;and(4)hydrocarbon-generating threshold is about 2500 m of burial depth.