Molecular geochemical characteristics of source rock in faulted lacustrine basin:A case study of the Lishu Fault Depression in southern Songliao Basin,China

作     者：LI Hongbo ZHANG Min CHEN Xiaohui 

作者机构：Department of GeochemistryYangtze University Key Laboratory of Exploration Technologies for Oil and Gas ResourcesMinistry of EducationYangtze University 

出 版 物：《Chinese Journal Of Geochemistry》 (中国地球化学学报)

年 卷 期：2013年第32卷第4期

页      面：413-419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] 

主　　题：梨树断陷 断陷湖盆 中国东部 分子组成 烃源岩 松辽盆地南部 地球化学特征 伽马蜡烷 

摘      要：Terrestrial faulted lacustrine basin is considered as a favorable place for the development of source rocks,especially the fault basins in eastern *** on molecular composition study of saturated and aromatic hydrocarbons in the extracts of source rocks of the Yingcheng and Shahezi formations in the Lishu Fault Depression,it is revealed that the extracts of source rocks are provided with low ratio of Pr/Ph,low content of C24 tetracyclic terpanes,high content of tricyclic terpanes and gammacerane,relatively high content of C27 steranes in the sag belt and its periphery;relatively high ratio of Pr/Ph,relatively high content of tetracyclic terpanes and gammacerane,low content of C27 steranes and obvious advantages of C29 steranes in its gentle slope belt;with high ratio of Pr/Ph,high content of C19,C20 tricyclic and C24 tetracyclic terpanes,very low content of gammacerane and C27 steranes,and high content of C29 steranes in the edge of fault *** to the organic matter input and sedimentary environment,three types of source rocks have been established,which,respectively,are the mode of mixing organic matter input in deep and semi-deep lake,the advantage of terrigenous input in shallow lake and terrigenous input in shore-shallow *** first mode is supposed to generate oil and gas,while the second one tends to generate *** distribution characteristics of oil and gas in the Lishu Fault Depression are very likely to be controlled by hydrocarbon generating characteristic of different source rock types.