火山岩风化壳储层特征及分布规律——以准噶尔西北缘中拐凸起石炭系火山岩为例

发布时间：2019-01-19 11:17

【摘要】：火山岩风化壳储层已成为重要的油气勘探新领域,开展风化壳储层特征及分布规律研究对火山岩油气勘探具有重要的理论和现实指导意义。利用钻井、岩心、测井、地震、分析化验等资料,从火山岩形成环境着手,对准噶尔盆地西北缘中拐凸起石炭系火山岩风化壳储层特征及控制因素开展综合研究,明确火山岩风化壳油气成藏模式及分布规律。研究表明:中拐凸起石炭系火山岩形成于岛弧环境,岩性以安山岩、凝灰岩为主;火山岩风化壳结构分为风化黏土层、强风化带、弱风化带及致密未风化带4层结构,其中强风化带储层物性最好,为主要的储层发育区;有效储集空间主要为次生孔隙和裂缝,裂缝对储层渗流能力有较好的改造作用;风化壳储层主要受风化淋滤作用、岩性岩相、构造位置及断裂(裂缝)等因素的控制;油气主要分布在距风化壳顶面480 m范围内,具有沿三带(靠近断裂带、构造高部位地带、有利岩相发育带)、一面(不整合面附近)分布的富集规律。
[Abstract]:Volcanic weathering crust reservoir has become an important new field of oil and gas exploration. It is of great theoretical and practical significance to study the characteristics and distribution of weathered crust reservoir. Based on the data of drilling, core, logging, seismic analysis and laboratory analysis, the characteristics and controlling factors of weathering crust of Carboniferous volcanic rocks in the northwestern margin of Junggar Basin are studied comprehensively from the formation environment of volcanic rocks. The oil and gas accumulation model and distribution law of volcanic weathered crust are defined. The results show that the Carboniferous volcanic rocks in the Zhongguai uplift are formed in the island arc environment, and the lithology is dominated by andesite and tuff. The weathering crust structure of volcanic rock can be divided into four layers: weathered clay layer, strong weathering zone, weak weathering zone and dense unweathered zone. The effective reservoir space is mainly secondary pores and fractures, and fractures have a better effect on reservoir percolation ability, weathering crust reservoir is mainly controlled by weathering leaching, lithologic lithofacies, structural location and fracture (fracture), etc. Oil and gas are mainly distributed in the range of 480 m from the top of the weathered crust. They have the law of enrichment along the three zones (near the fault zone, the high structural zone, the favorable lithofacies development zone) and one side (near the unconformable surface).
【作者单位】：西南石油大学地球科学与技术学院;中国地质大学(武汉)构造与油气资源教育部重点实验室;天然气地质四川省重点实验室;新疆油田公司石西油田作业区;中国石油塔里木油田分公司;
【基金】：构造与油气资源教育部重点实验室开放基金项目(TPR-2016-05) 天然气地质四川省重点实验室开放基金项目(2016trqdz01)
【分类号】：P618.13

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