低勘探程度地区烃源岩生烃特征研究——以渤海海域秦南凹陷为例  

Research on hydrocarbon generation characteristics of source rocks in low-exploration area——A case study of the Qinnan Sag,Bohai Bay Basin

作　　者：雷闯 殷世艳[1] 董桂玉 张盈 王宇 张伟华 马志刚 LEI Chuang;YIN Shiyan;DONG Guiyu;ZHANG Ying;WANG Yu;ZHANG Weihua;MA Zhigang(College of Mining Engineering,North China University of Science and Technology,Tangshan,Hebei,063210;Postdoctoral Research Station,PetroChina Jidong Oilfeld Company,Tangshan,Hebei,063000;Postdoctoral Center,China University of Geosciences,Wuhan,430074;Inner Mongolia Linhe Yellow Rever National Wetland Park Management Center,Bayannur,Inner Mongolia,015000)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]中国石油冀东油田公司博士后科研工作站,河北唐山063000 [3]中国地质大学博士后流动站,武汉430074 [4]内蒙古临河黄河国家湿地公园管理中心,内蒙古巴彦淖尔015000

出　　处：《地质论评》2024年第4期1391-1402,共12页Geological Review

基　　金：国家科技重大专项子课题(编号:2016ZX05024-002-003,2017ZX05032-001-004);河北省自然科学基金项目(编号:D2020209003);唐山市科技计划项目(编号:22130213H)的成果。

摘　　要：渤海海域秦南凹陷勘探程度低,亟需开展各洼陷烃源岩生烃特征的精细研究以揭示油气勘探潜力和勘探方向。基于地质类比方法,在合理选择地质模型及地质参数的基础上,利用BasinMod盆地模拟软件重建了秦南凹陷各洼陷烃源岩埋藏史、成熟度史和生烃史。结果表明,受差异性沉降和沉积的控制,东洼烃源岩成熟时间早且持续成熟时间长,现今已进入成熟—高成熟阶段(R_(o)=1.0%~2.0%),2次生烃作用分别发生在渐新世和中新世至今,生烃能力强;东南洼烃源岩成熟时间晚且持续成熟时间短,现今已进入中成熟阶段(R_(o)=0.7%~1.0%),主要生烃作用发生在中新世晚期至今,生烃能力强;西洼烃源岩普遍处于低成熟阶段(R_(o)<0.7%),主要生烃作用发生在上新世至今,生烃能力弱;层位上,各洼陷烃源岩生烃能力总体表现为沙三段>沙一段>东三段。秦南凹陷具有较好的油气勘探潜力,应紧紧围绕东洼和东南洼洼槽带及其斜坡带油气运移优势指向区选择有效圈闭进行钻探。Objectives:The Qinnan Sag in the Bohai Bay Basin is lowly explored,where hydrocarbon generation potential of source rocks is required detailed investigation to identify hydrocarbon exploration potential and exploration targets.Methods:Burial history,thermal history,and hydrocarbon generation history of source rocks at various subsags were reconstructed on BasinMod software based on reasonable geological model and parameters derived from geological analogy.Results:Source rocks in the Eastern Subsag were mature at early stage due to differential subsidence and sedimentation,which was lasted for a long period and was currently at maturity to high maturity stage(R_(o)=1.0%~2.0%).Two hydrocarbon generation events were occurred to them in the Oligocene and Miocene,respectively,with intensive hydrocarbon generation capacity.Source rocks at the Southeastern Subsag were mature at later stage,which was lasted for a short period and was currently at medium maturity stage(R_(o)=0.7%~1.0%).Hydrocarbon generation was primarily occurred since the late Miocene,with intensive hydrocarbon generation capacity.Source rocks at the Western Subsag were generally at low maturity stage(R_(o)<0.7%),which began to generate hydrocarbon since Pliocene,with weak hydrocarbon generation capacity.The hydrocarbon generation capacity of source rocks is generally in an order:Es3>Es1>Ed3.Conclusions:The Qinnan Sag has high oil and gas exploration potential,where exploration activities should focus on effective traps located in the dominant migration direction of the depression and slope zones in the Eastern and Southeastern Subsags.

关 键 词：地质类比方法 烃源岩 盆地模拟 成熟度史 生烃史 秦南凹陷 

分 类 号：P618.13[天文地球—矿床学]