Source rock evaluation based on seismic data combined with organic geochemistry and logging information: a case study on the Es3 in Liaozhong Sag,Bohai Bay Basin
Hou Qingjie1, Jin Qiang1, Wu Kui2, Zhang Rucai2, Duanmu Xiaoxiao1, Hong Guolang1
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Exploration and Development Research Institute, Tianjin Branch, CNOOC, Tianjin 300452, China
Abstract：In this paper we propose a source rock evaluation based on seismic data combined with organic geochemistry and logging information.3D seismic surveys covered almost the entire area of Liaozhong Sag,Bohai Bay Basin.First we achieve the fitting of the total organic carbon content (TOC) values obtained from the thermal simulation and the log parameters AC and RT normalized values,and establish respectively TOC log prediction models for the middle Es3 and the lower Es3.Then we identify the distribution and thickness of source rocks with seismic phase identification and seismic wave impedance inversion.After that,with the fitting of the average fiattened reflection strength,RMS amplitude,mean instantaneous frequency,and average instantaneous phase,we establish a TOC empirical formula of source rocks.Finally we predict the organic matter abundance of source rocks with this formula.The average relative error for TOC is only 9.56% between our prediction and the measured value of source rocks from logging data,and the average relative error for source rock thickness is only 10.06%,which proves the high reliability and practicality of the proposed approach.Based on our prediction in Liaozhong Sag,thicker source rocks are distributed in Liaozhongbei and Liaozhongzhong sub-sags,and source rock TOC and thickness in the middle Es3 is better than in the lower Es3.
侯庆杰, 金强, 吴奎, 张如才, 端木潇潇, 洪国郎. 综合有机地球化学和测井信息的烃源岩地震评价——以辽中凹陷沙三段为例[J]. 石油地球物理勘探, 2018, 53(4): 817-825.
Hou Qingjie, Jin Qiang, Wu Kui, Zhang Rucai, Duanmu Xiaoxiao, Hong Guolang. Source rock evaluation based on seismic data combined with organic geochemistry and logging information: a case study on the Es3 in Liaozhong Sag,Bohai Bay Basin. Oil Geophysical Prospecting, 2018, 53(4): 817-825.
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