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Heterogeneity and evolution model of the Lower Shahejie Member 3 mud-shale in the Bonan Subsag,Bohai Bay Basin:An example from Well Luo 69
Pages: 219-229
Year: Issue:  2
Journal: Oil & Gas Geology

Keyword:  heterogeneityevolution modelmud shalethe Lower 3rd member of the Shahejie FormationBonan SubsagBohai Bay Basin;
Abstract: Multiple heterogeneity characteristics and evolutionary process of the Lower member 3 of Paleogene Shahejie Formation lacustrine shale in the Bonan Subsag,Jiyang Depression have been analyzed based on previous sequence stratigraphic framework and analysis of core observation and sample testing.The results show that the Lower Es3(下) can be described as a third-order sequence,which can be divided into expanding systems tract (EST),early highstand systems tract(EHST) and late highstand systems tract (LHST).Lithofacies associations,mineralogy,algae species occurrence,as well as TOC (total organic carbon) and kerogen type,change noticeably and regularly in the Lower Es3 shale within the sequence stratigraphic framework.For lithofacies associations,six lithofacies are identified.From the EST to the LHST,there are increased abundance in clay minerals,quartz and feldspar,and reduced abundance in calcite and dolomite,while pyrite reached the highest abundance in EHST.Algaes have the largest number and most variety of species in the LHST.TOC content is the lowest in the EST.Kerogen type is dominated by type Ⅰ and Ⅱ1.The oil richness is influenced by multiple heterogeneity characteristics,comparative analysis suggests the EHST is the most potential shale oil target interval in the study area with excellent oil richness.
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