Identification of High quality Source Rocks by Seismic Facies: Taking the third member of Shahejie Formation in Liaozhong Depression as an example

Key words: 
• highquality source rocks /
• seismic facies /
• the third member of Shahejie Formation /
• Liaozhong Depression
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Abstract: Based on fine horizon calibration of the third member of Shahejie formation in  Liaozhong Depression, seismic stratigraphic interpretation is completed by seismic modeling. According to the definition and criterion of identification of highquality hydrocarbon source rocks, mainly for dark mudstone with rich organic matter of semideepdeep lacustrine facies, features of seismic facies such as low frequency, continuation and strong reflection is identified. Based on the analysis of seismic facies and sedimentary facies, seismicsedimentary  facies models are established and distribution of highquality hydrocarbon source rocks of Shahejie Formation in Liaozhong Depression is predicted. The results show that highquality hydrocarbon source rocks is mainly distributed in the north sag of Liaozhong Depression，the range decreases gradually from north to south. In the north, highquality hydrocarbon source rocks is well developed, but in the central area and south, It is only developed in the middle and lower part of the third member of Shahejie Formation,respectively.