准噶尔盆地东部帐篷沟地区中新生代构造事件及其油气地质意义  

Meso-Cenozoic tectonic events and their petroleum geological significance in Zhangpenggou area,eastern Junggar Basin

作　　者：聂礼尚 马静辉 唐小飞 杨智 张婉金 李鸿蕊 NIE Lishang;MA Jinghui;TANG Xiaofei;YANG Zhi;ZHANG Wanjin;LI Hongrui(College of Geology and Mining Engineering,Xinjiang University,Urumqi 830047,Xinjiang,China)

机构地区：[1]新疆大学地质与矿业工程学院,乌鲁木齐830047

出　　处：《岩性油气藏》2023年第5期81-91,共11页Lithologic Reservoirs

基　　金：新疆维吾尔自治区自然科学基金“西准噶尔推覆带构造演化、成因机制及其对油气的控制作用”(编号:2021D01C041);新疆大学博士科研启动基金项目“西准噶尔造山带燕山期构造事件研究:来自裂变径迹年代学的证据”(编号:2020740013)联合资助。

摘　　要：以野外露头、钻井、地震资料等为基础,通过区域性不整合面识别、磷灰石裂变径迹年龄分析及埋藏生烃史恢复等方法,对准噶尔盆地东部帐篷沟地区中新生代主要构造事件及其对油气成藏的影响进行了研究。研究结果表明:(1)帐篷沟地区中新生界存在4期区域性不整合,分别为侏罗系八道湾组与三叠系小泉沟群不整合(J_(1)b/T_(2-3)xq)、白垩系吐谷鲁群与侏罗系石树沟群不整合(K_(1)tg/J_(2-3)sh)、新近系沙湾组与白垩系吐谷鲁群不整合(N_(1)s/K_(1)tg)、第四系与新近系沙湾组不整合(Q/N_(1)s),分别对应晚三叠世—早侏罗世挤压隆升、晚侏罗世—早白垩世挤压隆升、晚白垩世—古新世隆升掀斜和中新世至现今持续隆升剥蚀4期构造抬升事件;各期构造事件都具有明显的区域构造背景和褶皱、断裂等地质响应。(2)研究区晚三叠世—早侏罗世的隆升使得烃源岩生烃速率下降,油气热演化程度降低;晚侏罗世—早白垩世挤压隆升事件产生的断裂成为油气输导的有效通道,与油气充注期匹配良好,是油气成藏的关键性构造事件;晚白垩世—古新世隆升、中新世至现今持续隆升对后期油藏多具有改造和破坏作用;克拉美丽断裂的形成对研究区的油气成藏具有控制作用。(3)研究区油源主要来自于中二叠统平地泉组,成藏模式为近源侧向运移自生自储型,油气在背斜翼部岩性遮挡区和构造高部位成藏,构造运动产生的断裂和不整合面控制油气的平面分布;断裂、不整合面附近的二叠系平地泉组是油气勘探的有利区。On the basis of field outcrops,drilling and seismic data,through the methods of regional unconformity identification,apatite fission track age analysis and buried hydrocarbon generation history recovery,the main tectonic events of Meso-Cenozoic in Zhangpenggou area in the eastern Junggar Basin and their effects on hydrocarbon accumulation were studied.The results show that:(1)There are four stages of regional unconformity in the Meso-Cenozoic era in Zhangpenggou area,namely,the unconformity between Jurassic Badaowan Formation and Triassic Xiaoquangou Formation(J_(1)b/T_(2-3)xq),the unconformity between Cretaceous Tugulu Group and Jurassic Shishugou Group(K_(1)tg/J_(2-3)sh),the unconformity between Neogene Shawan Formation and Cretaceous Tugulu Group(N_(1)s/K_(1)tg)and the unconformity between Quaternary and Neogene Shawan Formation(Q/N_(1)s),which respectively correspond to four tectonic uplift events,namely,the Late Triassic to Early Jurassic compressional uplift,Late Jurassic to Early Cretaceous compressional uplift,Late Cretaceous to Paleocene uplift and tilting,and Miocene to present continuous uplift and denudation.Each tectonic event has obvious regional tectonic background and geological response such as folds and faults.(2)The uplift of the Late Triassic to Early Jurassic in the study area resulted in a decrease in the rate of hydrocarbon generation of the source rocks and the thermal evolution of hydrocarbon.The fault generated by the Late Jurassic-Early Cretaceous compressional uplift event became an effective channel for hydrocarbon transmission,which matched well with the hydrocarbon filling period,and was a key structural event for hydrocarbon accumulation.Late Cretaceous to Paleocene uplift and tilting,and Miocene to present continuous uplift play a role in the reconstruction and destruction of later oil reservoirs.The formation of Kelameili fault has a controlling effect on hydrocarbon accumulation in the study area.(3)The oil source in the study area mainly comes from Middle Permian Pingdiquan For

关 键 词：克拉美丽断裂 不整合面 磷灰石裂变径迹 埋藏生烃史 构造油气藏 岩性油气藏 中新生代 帐篷沟地区 准噶尔盆地东部 

分 类 号：TE122[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]