辽西凌源地区中元古界洪水庄组沉积相特征及烃源岩评价  

Sedimentary facies characteristics and source rocks evaluation of Mesoproterozoic Hongshuizhuang Formation in Lingyuan area,western Liaoning

作　　者：张立亚[1] ZHANG Liya(Northeast Oil&Gas Branch of SINOPEC,Changchun 130061,China)

机构地区：[1]中国石化东北油气分公司,长春130061

出　　处：《世界地质》2024年第3期390-402,共13页World Geology

基　　金：中国石油化工集团有限公司科技攻关项目(P22063)。

摘　　要：基于岩心、野外剖面、薄片和有机地球化学资料,开展辽西淩源地区中元古界洪水庄组沉积相特征研究和烃源岩评价。研究结果表明,中元古界洪水庄组主要为海槽相和碳酸盐岩台地相沉积,自下而上的低位体系域主要为深水海槽相和浅海陆棚相沉积,海侵体系域时期主要为深水海槽相和深水斜坡相沉积,高位体系域主要为深水缓坡和潮缘岸滩相沉积。洪水庄组烃源岩总有机碳w(TOC)平均为4.75%,(S_(1)+S_(2))平均为6.9 mg/g,整体上为好-很好烃源岩,有机质类型通过氢指数与T max交互图和干酪根显微组分综合分析,表明洪水庄组烃源岩主要为Ⅰ-Ⅱ1型干酪根,生油潜力巨大,热演化程度上T max平均为438.3℃,干酪根颜色为棕色,表明正处于成熟生油阶段。整体上看,低位体系域和海侵体系域的海槽相黑色泥岩油气潜力巨大,为下一步勘探研究的重点对象。Based on the cores,field sections,thin sections and organic geochemical data,the sedimentary facies characteristics of the Mesoproterozoic Hongshuizhuang Formation and the evaluation of source rocks were carried out.The results show that the Mesoproterozoic Hongshuizhuang Formation is mainly deposited by trough facies and carbonate platform facies,the bottom-up low-level system tract is mainly composed of deep-water trough facies and shallow shelf facies sedimentation,the transgression system tract is mainly composed of deep-water trough facies and deep-water slope facies sedimentation,and the high-level system tract is mainly composed of deep-water gentle slope and tidal margin shore beach facies deposits.The average abundance of total organic carbon in the source rocks of Hongshuizhuang Formation was 4.75%and(S_(1)+S_(2))was 6.9 mg/g,which were generally good-very good source rocks,and the organic matter types were mainlyⅠ-Ⅱ1 type kerogen with great oil production potential,and the average T max was 438.3℃and the kerogen was brown,indicating that it was in the stage of mature oil production.On the whole,the trough facies black mudstone in the low-level system and transgression system tracts has great oil and gas potential,which is the focus of the next exploration and research.

关 键 词：层序划分 沉积相特征 烃源岩评价 洪水庄组 凌源地区 

分 类 号：P618.13[天文地球—矿床学]