doi:10.16186/j.cnki.1673-9787.2022060055

Received:2022-06-22

Revised:2022-09-28

Online Date:2023-08-03

Comprehensive Identification and Distribution Prediction of Source Rocks in Es₁ in Nanpu Sag（Online）

LI Yuezhe, YIN Jie, YE Lin, WANG Zhenqi

School of Geosciences，Yangtze University，Wuhan 430100，Hubei，China

Abstract:In order to solve the problem of obvious heterogeneity of source rock development and distribution in different sub sags in Nanpu Sag，the identification and distribution prediction of hydrocarbon source rock series were carried out in depth ΔlgR  method and the multivariate linear Law of Return method are used to establish the quantitative prediction model of TOC of source rock for different sedimentary facies belts in the study area. The corresponding relationship between seismic reflection characteristics and geochemical characteristics of Source rock in the work area is established，and horizontal tracking is carried out. The results show that the TOC curves of high quality source rocks are mainly box-shaped with sawtoothshaped characteristic curves，and the seismic reflection features are mainly of medium-strong amplitude， medium-high frequency，high continuity and subparallel-parallel reflection structure；the TOC curves of medium quality are high value spike sawtooth-shaped，and the seismic phase features are of medium-weak amplitude，medium-low frequency，high continuity and subparallel structure.The source rocks are mainly distributed between the No.5 and No.1 tectonic zones，the upper plate of the combination of the Gaoliu fault andthe Southwest Zhuang fault，and near the No.3 tectonic zone.As the exploration practice of unconventionaloil and gas reservoirs in Nanpu Depression gradually deepens，the above results provide theoretical guidance for the subsequent exploration and development.

Key words:Nanpu sag;Es;source rock;well logging response;distribution prediction

CLC：P618.13