Differences in geochemistry and hydrocarbon generation of sourcerock samples dominated by telalginite and lamalginite: A case study on the Permian saline lacustrine source rocks in the Jimusaer Sag, NW China  

作　　者：Shi-Ju Liu Gang Gao Wen-Zhe Gang Bao-Li Xiang Ming Wang 

机构地区：[1]College of Geosciences,China University of Petroleum,No.18 Fuxue Road,Beijing,102249,China [2]State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,No.18 Fuxue Road,Beijing,102249,China [3]Experimental Testing Institute,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang,834000,China

出　　处：《Petroleum Science》2023年第1期141-160,共20页石油科学（英文版）

摘　　要：The Middle Permian Lucaogou Formation in Northwestern China mainly contains typical saline lacustrine oil shale.To study the differences in geochemistry and hydrocarbon generation of source-rock samples in Lucaogou Formation in Jimusaer Sag,57 core samples from two boreholes were analyzed herein by performing total organic carbon(TOC)analysis,RockeEval pyrolysis,and gas chromatographicemass spectrometry experiments on saturated hydrocarbons.The kinetics of oil generation were studied using two samples comprising typical maceral components.The results showed that the hydrocarbons produced by telalginite are relatively rich in pristane(Pr),phytane(Ph),b-carotane,high-carbon normal alkanes,and C29 regular steranes.Hydrocarbons produced by lamalginite contain a significantly higher content of C20 tricyclic terpanes(TT),C21TT,C24 tetracyclic terpanes(TeT),C29 norhopane,and C28 regular sterane.Based on the pyrolysis and biomarker compound parameters,telalginite has a higher conversion rate for hydrocarbons than lamalginite in the low-mature to mature stage,which is consistent with their kinetic analysis.Lamalginite source rock displays a much narrower distribution of activation energies than telalginite source rocks.Such narrower activation energy distribution effectively narrows the main stage of hydrocarbon generation.In addition,the activation energy distribution of lamalginite concentrated in the high-value interval,indicating the characteristics of the relatively lagging hydrocarbon generation of lamalginite.

关 键 词：Maceral component Biomarker compounds Oil generation kinetics Activation energy Lucaogou formation 

分 类 号：P618.13[天文地球—矿床学]