塔里木盆地志留系热液碎屑岩储层:证据、矿物组合及油气地质意义

doi:10.11743/ogg20140617

摘要/Abstract

摘要： 根据岩心观察、扫描电镜、能谱分析、显微薄片观察及流体包裹体测温显示的岩石宏观与微观特征、矿物组合、自生矿物形成温度等,认为塔里木盆地存在热液碎屑岩储层.热液碎屑岩岩石学证据主要体现在塔中地区中1井志留系柯坪塔格组碎屑岩中发育的基性侵入岩夹层、热液角砾岩、热炙烤现象及热液溶蚀孔洞等;在塔里木盆地中部的塔中地区和顺托果勒地区柯坪塔格组可识别出3种热液矿物组合.综合前人研究成果,认为热液的侵入主要发生于二叠纪,造成储集岩孔隙流体离子环境紊乱,溶解作用的发生促进了次生孔隙发育,并沉淀了热液矿物,总体上改善了碎屑岩储层,是塔里木盆地柯坪塔格组碎屑岩储层不可忽视的影响因素.热液侵入对已形成的古油藏产生破坏作用,并在志留系沥青砂岩生成过程中产生重要作用.

关键词: 热液, 矿物组合, 次生孔隙, 碎屑岩储层, 志留系, 塔里木盆地

Abstract: Comprehensive analyses of various data including core, scanning electron microscope, energy spectrum, thin section, fluid inclusion mineral assemblages and authigenic mineral forming temperature reveal evidences that hydrothermal clastic reservoirs exist in the Tarim Basin. The petrological evidences were found in the Silurian Kepingtage Formation in Well Zhong-1 as interlayers of ultrabasic intrusive rock, hydrothermal breccias, thermal burning phenomena and hydrothermal corrosion caverns. Three hydrothermal mineral assemblages were identified in the clastic reservoirs of Kepingtage Formation in Tazhong and Shuntuoguole area in Central Tarim Basin. Thermal fluids invasion occurred mainly in the Permian, causing the ionic disturbance of pore fluid. The dissolution in the clastic reservoirs accelerated the development of secondary porosity and the precipitation of hydrothermal minerals, which improved the overall reservoir quality and was an ignorable factor for the the formation of the clatic reservoirs in the Kepingtage Formation. The infusion of hydrothermal fluid would destroy the paleo-oil reservoirs, thus might play a key role in the formation of the Silurian asphalt sandstones in the Tarim Basin.

Key words: hydrothermal solution, mineral assemblage, secondary pore, clastic reservoir, Silurian, Tarim Basin

中图分类号:

TE122.2

时志强,王毅,金鑫,等. 塔里木盆地志留系热液碎屑岩储层:证据、矿物组合及油气地质意义[J]. 石油与天然气地质, 2014, 35(6): 903-913. doi: 10.11743/ogg20140617 Shi Zhiqiang,Wang Yi,Jin Xin,et al. The Silurian hydrothermal clastic reservoirs in Tarim Basin: evidences, mineral assemblages and its petroleum geological implications[J]. Oil & Gas Geology, 2014, 35(6): 903-913. doi: 10.11743/ogg20140617

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