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Controlling factors of high-quality lacustrine hydrocarbon source rocks in southern Changling Depression
Pages: 209-218,229
Year: Issue:  2
Journal: Oil & Gas Geology

Keyword:  trace elementpaleoproductivitysedimentary settinghigh-quality hydrocarbon source rockChangling De-pressionSongliao Basin;
Abstract: Heterogeneity study of lacustrine source rocks relys heavily on a deeper understanding of the major controlling factors on their formation. Geochemical,petrological and sequence stratigraphy analyses of two sets of source rocks( K1 sh and K1 yc) in southern Changling Depression,Soliao Basin,reveal that multiple factors played roles in shaping the distri-bution of organic matters there. Al/Ti ratio was used to evaluate their paleoproductivity. Parameters like V/Cr,V/( V+Ni) ,Sr concentration,Sr/Ba,and Sr/Cu as well as paleoclimatic indexes,were also employed to study their sedimentary settings. Results show that high-quality source rocks( mainly in upper Shahezi Formation) were developed in a highstand system tract and lacustrine transgressive system tract that featured in medium paleoproductivity,humid paleoclimate,low paleosalinity and low deposition rate. They are rich in Al,Ba,Cu,Cr,V and Ni,but lack of Mn and S. Meanwhile,low-quality source rocks( maninly found in the Yingcheng Formation) ,were developed in lowstand system tract( LST) that was characterized by low paleoproductivity,semi-arid paleoclimate,high paleosalinity and high deposition rate. They are abun-dant in Co,Sr and V but lack of Al,Ba,Cr,Cu,Mn and Ni. We therefore suggest that,in the study area,(1)system tracts controlled the distribution of source rocks,(2) moderate-to-good primary productivity was a critical precondition for the development of high-quality source rocks,and(3)humid climate,low salinity as well as favorable sedimentation rate,were the reasons behind organic matter accumlations.
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