渤海湾盆地渤南洼陷沙三下亚段泥页岩非均质性特征及演化模式——以罗69井为例

doi:10.11743/ogg20170202

Abstract

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 Es^3(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.

Key words: heterogeneity, evolution model, mud shale, the Lower 3rd member of the Shahejie Formation, Bonan Subsag, Bohai Bay Basin

CLC Number:

TE122.1

Peng Li, Lu Yongchao, Peng Peng, Liu Huimin, Liu Zhanhong, Du Xuebin, Li Jijun, Zhang Sansheng. 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[J]. Oil & Gas Geology, 2017, 38(2): 219-229.

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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

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