Chronology and tectonic settings of igneous rocks and origin of volcanic reservoirs in Ludong area, eastern Junggar Basin

doi:10.7623/syxb201203002

Editorial office of ACTA PETROLEI SINICA ›› 2012, Vol. 33 ›› Issue (3): 351-360.DOI: 10.7623/syxb201203002

• Petroleum Exploration • Previous Articles Next Articles

Chronology and tectonic settings of igneous rocks and origin of volcanic reservoirs in Ludong area, eastern Junggar Basin

LUO Jinglan 1　HOU Lianhua 2　JIANG Yiqin 3　SHAO Hongmei 4　YANG Yanfang 1　GUO Yongfeng 1　KANG Jing 1

Received:2011-11-12 Revised:2012-02-28 Online:2012-05-25 Published:2012-07-20

陆东地区火成岩形成时代与构造背景及火山岩储层成因

罗静兰 1　侯连华 2　蒋宜勤 3　邵红梅 4　杨艳芳 1　郭永峰 1　康　静 1

1西北大学大陆动力学国家重点实验室　陕西西安　710069； 2中国石油勘探开发研究院　北京　100083； 3中国石油新疆油田公司勘探开发研究院　新疆克拉玛依　834000； 4大庆油田有限责任公司勘探开发研究院　黑龙江大庆　163712

通讯作者: 罗静兰
作者简介:罗静兰，女，1957年11月生，1982年毕业于西北大学，现为西北大学地质系教授，主要从事储层沉积学、火山岩油气藏岩性与岩相学、储层特征及成岩作用研究。
基金资助:
国家重大科技专项（2008ZX05001-003-004、2011ZX05001-002-008）和国家自然科学基金项目（No.40872083）资助。

Abstract

Abstract:

Characteristics of igneous petrology and lithofacies as well as the origin, chronology and tectonic evolution settings of Carboniferous igneous reservoirs in the eastern Junggar Basin were investigated,based upon the observation and description of drilled igneous cores, the identification and quantitative statistics of normal and cast thin sections for minerals under microscope, the measurement of porosity and permeability of reservoir rocks, the determination of homogeneous temperatures and chemical compositions of diagenetic liquid inclusions from volcanic rocks, the analysis of major and trace elements of whole rocks, and the in-situ U-Pb dating of zircons from igneous rocks with LA-ICPMS technique, finally a igneous lithofacies model was established. The research result showed that the volcanic eruption activity in the study area occurred in an active continental margin island arc under an extrusion tectonic setting related to oceanic plate subduction in Early Carboniferous (321 Ma~369 Ma). The extensive intrusion of diabase occurred in Early Permian (283 Ma±), implying that the eastern Junggar block had then been in a tectonic evolution phase of the inner-plate extension continental rift. igneous rocks were once subject to reworking by thermal events during Jurassic (190 Ma～149 Ma). The formation of volcanic reservoirs and the improvement of their quality were closely related to weathering, leaching and denudation of the top Carboniferous erosion zone. Thus, they mainly belong to a weathering-typed volcanic gas pool. The volcanic eruption in the study area was dominantly characterized by central eruption with fissure eruption in the second place. Five igneous lithfacies, including volcanic eruption, volcanic effusion, volcanic conduit, volcanic deposit and shallow intrusion along with nine sub-lithofacies, could be recognized in the study area.

Key words: origin of volcanic reservoir, U-Pb dating by LA-ICPMS zircon, tectonic setting, lithofacies model, Junggar Basin

摘要：

在岩心观察基础上，通过常规与铸体薄片显微镜下鉴定与定量统计，孔隙度与渗透率、包裹体均一温度与成分、全岩主微量元素、LA-ICPMS锆石微区U-Pb定年等分析测试，对准噶尔盆地陆东地区火成岩岩性、火成岩形成时代、储层成因进行了研究，建立了火成岩的岩相模式。结果表明，研究区火山喷发活动发生于早石炭世（321~369 Ma）与板块俯冲作用相关的活动大陆边缘岛弧挤压构造环境。早二叠世（约283 Ma±）是辉绿岩的主要侵位时期，表明准噶尔地块东部已进入陆内伸展拉张的大陆裂谷构造体制演化阶段。火成岩在侏罗纪（190～149 Ma）曾遭受过热地质事件的改造。火山岩储层的形成与储集性能的改善主要与石炭系顶部风化剥蚀面的风化淋滤溶蚀作用有关，主要属于风化型火山岩气藏。可分为火山爆发相、火山溢流相、火山通道相、火山沉积相与浅成侵入相5个岩相及9种亚相类型。

关键词: 火山岩储层成因, LA-ICPMS锆石U-Pb定年, 构造背景, 岩相模式, 准噶尔盆地

LUO Jinglan　HOU Lianhua　JIANG Yiqin　SHAO Hongmei　YANG Yanfang. Chronology and tectonic settings of igneous rocks and origin of volcanic reservoirs in Ludong area, eastern Junggar Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(3): 351-360.

罗静兰　侯连华　蒋宜勤　邵红梅　杨艳芳　郭永峰　康　静. 陆东地区火成岩形成时代与构造背景及火山岩储层成因[J]. 石油学报, 2012, 33(3): 351-360.

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Chronology and tectonic settings of igneous rocks and origin of volcanic reservoirs in Ludong area, eastern Junggar Basin

陆东地区火成岩形成时代与构造背景及火山岩储层成因

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