沁水盆地南部前寒武系地层系统厘定与分布特征及有利生烃区预测  

Determination of the Precambrian stratigraphic system,distribution characteristics,and prediction of favorable hydrocarbon-generating areas in the southern Qinshui Basin

作　　者：杨延辉 刘忠 丁文龙[2] 张永平 陈彦君 米忠波 罗金洋 张鹏豹 刘天顺 程晓云 王三帅 韩煦 王玉婷 魏宁 YANG Yanhui;LIU Zhong;DING Wenlong;ZHANG Yongping;CHEN Yanjun;MI Zhongbo;LUO Jinyang;ZHANG Pengbao;LIU Tianshun;CHENG Xiaoyun;WANG Sanshuai;HAN Xu;WANG Yuting;WEI Ning(Huabei Oilfield Company,PetroChina,Renqiu 062552,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430047,China)

机构地区：[1]中国石油华北油田分公司,河北任丘062552 [2]中国地质大学(北京)能源学院,北京100083 [3]中国地质大学(武汉)资源学院,湖北武汉430074

出　　处：《地学前缘》2025年第2期242-260,共19页Earth Science Frontiers

基　　金：国家自然科学基金面上项目(42372171,42072173);中国石油华北油田分公司项目“沁水盆地前寒武纪天然气成藏主控因素研究及有利勘探目标区优选(HBYT-KTY-2022-286)”。

摘　　要：沁水盆地南部发育巨厚的前寒武纪沉积地层,具备重大油气勘探潜力,是值得勘探的新领域。然而,这套地层的地质属性一直存在争议。本文基于野外露头地质调查、烃源岩地球化学实验分析、地震资料精细解析,并借鉴前人相关研究成果,厘定了沁水盆地南部前寒武系地层系统,查明了该区前寒武系沉积地层分布特征,预测了有利生烃区。研究结果表明:沁水盆地南部前寒武纪沉积地层应归属于熊耳裂陷槽,自下而上发育长城系熊耳群、云梦山组、白草坪组、北大尖组、崔庄组、洛峪口组和蓟县系龙家园组。云梦山组、白草坪组、北大尖组和崔庄组整体呈现为中南部厚度大,往东、往北、往西地层厚度变薄的趋势;洛峪口组表现为中部厚度大,往东或者往西厚度变小趋势;龙家园组地层厚度呈现为东部厚度大,往西地层厚度变薄的趋势。依据生烃区发育的地层厚度、岩性、地震相和沉积相等控制因素,认为龙家园组白云岩的有利生烃区面积相对较大,主要位于研究区东部,而崔庄组泥岩有利生烃区面积相对较小,主要位于研究区南部。本研究不仅对华北克拉通南部前寒武纪含油气盆地内地质理论研究具有重要意义,而且对进一步明确沁水盆地南部前寒武系烃源岩特征和分布及未来沁水盆地南部前寒武系油气勘探部署优选具有重要参考价值。The southern Qinshui Basin hosts a thick sequence of Precambrian sedimentary strata with significant hydrocarbon exploration potential,making it a promising area for future exploration.However,the geological characteristics of these strata remain a subject of debate.This study integrates field outcrop surveys,geochemical analyses of hydrocarbon source rocks,detailed seismic data interpretation,and previous research findings to establish the Precambrian stratigraphic system,analyze the distribution characteristics of the sedimentary strata,and predict favorable hydrocarbon-generating areas.The results reveal that the Precambrian sedimentary strata in the southern Qinshui Basin belongs to the Xiong’er Rift system.From bottom to top,these strata include the Changchengian Xiong’er Group,Yunmengshan Formation,Baicaoping Formation,Beidajian Formation,Cuizhuang Formation,Luoyukou Formation,and the Jixian System Longjiayuan Formation.The Yunmengshan,Baicaoping,Beidajian,and Cuizhuang Formations exhibit greater thickness in the central and southern regions,thinning toward the east,north,and west.The Luoyukou Formation shows maximum thickness in the central region,thinning toward the east and west,while the Longjiayuan Formation is thickest in the east and thins toward the west.The study identifies the Longjiayuan Formation as having relatively large favorable hydrocarbon-generating areas,primarily in the eastern part of the study area by analyzing factors such as stratigraphic thickness,lithology,seismic facies,and sedimentary facies.In contrast,the Cuizhuang Formation has smaller favorable hydrocarbon-generating areas,mainly located in the southern part of the study area.This research contributes to the geological understanding of Precambrian petroleum systems in the southern North China Craton,clarifies the characteristics and distribution of Precambrian source rocks in the southern Qinshui Basin,and provides guidance for optimizing future exploration strategies for Precambrian oil and gas resources.

关 键 词：前寒武系 地层系统 地层分布 有利生烃区 沁水盆地 

分 类 号：P539.1[天文地球—古生物学与地层学] P534.1[天文地球—地质学]