Control of different occurrence types of organic matter on hydrocarbon generation in mudstones  

作　　者：Peng-Yan Du Jin-Gong Cai Qing Liu Xue-Jun Zhang Juan Wang 

机构地区：[1]State Key Laboratory of Marine Geology,Tongji University,Shanghai,200092,China [2]Exploration and Development Research Institute of Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257001,China

出　　处：《Petroleum Science》2022年第4期1483-1493,共11页石油科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Grant Nos. 41672115 and 41972126);the National Science and Technology Major Project of China(Grant No. 2016ZX05006001-003)。

摘　　要：Organic matter(OM) is preserved as different occurrences in mudstones, which can affect the hydrocarbon generation process. However, little research has focused on hydrocarbon generation as a function of different occurrences of OM. This study collected a suite of mudstones in the Dongying Sag, Bohai Bay Basin, and conducted Rock-Eval Ⅵ pyrolysis after Soxhlet extraction and Na_(2)S_(2)O_(8) oxidation, aiming to quantify the OM with different occurrences and figure out the contributions of each occurrence of OM to the hydrocarbon generation. There are three types of occurrences of OM: soluble organic matter(SOM),mineral-bound organic matter(MOM), and particulate organic matter(POM). MOM is the most abundant among the three occurrence types of OM. SOM and MOM are the main hydrocarbon precursors, and their hydrocarbon contributions alternate with different kerogen types and layers. Additionally, MOMcontributed hydrocarbons are numerous at shallow depths;SOM-contributed hydrocarbons mainly occur at deep depths;and POM-contributed hydrocarbons change little with depth. These results demonstrate that MOM should be the main hydrocarbon precursor in shallow formations and that SOM is the main hydrocarbon contributor at deep depths.

关 键 词：Soluble organic matter Mineral-bound organic matter Particulate organic matter Hydrocarbon precursor Rock-EvalⅥpyrolysis 

分 类 号：P618.13[天文地球—矿床学]