Experimental Simulation Study of the Dominant Enrichment Area of Terrestrial Organic Matter in the Shallow-Delta Sedimentary System of the Yacheng Formation in the Qiongdongnan Basin

作     者：XU Xinde YANG Xibing QU Tong GAO Gang LIANG Gang LI Xing XU Xinde;YANG Xibing;QU Tong;GAO Gang;LIANG Gang;LI Xing

作者机构：CNOOC China LimitedZhanjiang BranchZhanjiangGuangdong 524057China State Key Laboratory of Petroleum Resources and ProspectingChina’s University of PetroleumBeijing 102249China College of GeosciencesChina’s University of PetroleumBeijing 102249China CNOOC China LimitedHainan BranchHaikou 570312China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2022年第96卷第5期

页      面：1693-1703页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the CNOOC 13th FiveYear Plan Oil and Gas Resources Evaluation Project (No. YXKY-2018-KT-01) 

主　　题：shallow-delta sea sedimentary system deep water area terrestrial organic matter flume experiment enrichment area Qiongdongnan Basin 

摘      要：Shallow-delta sedimentary systems receive both terrestrial and marine organic matter. As oil and gas exploration activities determine that the source rocks of the deep-water area of the Qiongdongnan Basin, northern South China Sea, are generally rich in and even dominated by terrestrial organic matter, this has led many researchers to examine the rules governing terrestrial organic matter enrichment in shallow-delta sea sedimentary systems. However, the deep burial of source rocks in deep-water areas and the relatively small amount of drilling undertaken have greatly restricted the study of these rules. In this study, the ‘forward modeling research method was used to observe and analyze the deposition and preservation of terrestrial organic matter through flume experiments, where the depositional results were carefully depicted and sampled. The total organic carbon content of selected samples was measured and when combined with qualitative observations and quantitative comparison results, the dominant enrichment areas of terrestrial organic matter were identified. The experimental results show that the overbank parts of the delta front, the dune countercurrent surface, the low-lying parts, the delta front slope area and the shallow-prodelta sea area are where terrestrial organic matter is predominantly enriched. This provides an important basis and guidance for the prediction of the development areas of marine source rocks with terrestrial input in the deep-water areas of the Qiongdongnan Basin.