ORGANIC GEOCHEMICAL CHARACTERISTICS CONTRAST OF TERNARY, SUPERCRITICAL AND CHLOROFORM EXTRACTION-A CASE FROM THE FOURTH MEMBER OF SHAHEJIE FORMATION IN THE DONGYING SAG OF THE BOHAI BAY BASIN

In the paper,the extractive contents,group components and chromatography of four source rock specimens in the lower part of the Fourth Member of Shahejie Formation of Paleogene,the Dongying Sag of the Bohai Bay Basin was analyzed,using the methods of the ternary extraction,supercritical extraction and chloroform extraction.The extractive contents showed that the capability of ternary extraction is higher than that of supercritical extraction,and ternary extraction may be a relative effective method especially in the evaluation of higher maturity source rock.The contrast of group components and chromatography characteristics showed that the capability of extracting middle-high carbon number n-alkanes and heteroatom-containing compounds by ternary extraction is higher than that of supercritical extraction and the chromatography characteristics of ternary extract is different from that of chloroform extraction,but the chromatography characteristics of supercritical extract is similar to that of chloroform extraction.