摘要
形成环境是影响火山岩储层发育的重要因素之一,准确判别火山岩形成环境对指导火山岩油气勘探具有重要的支撑作用。通过对准噶尔盆地东部石炭系火山岩宏观微观岩石学和地球化学特征分析,发现可以从岩石学相标志、古生物学相标志和地球化学相标志判别火山岩形成环境,陆上与水下环境形成的火山岩发育不同的岩性组合和宏观微观结构构造特征,腕足类等各种海相化石都是水下环境火山岩的典型标志。在地球化学方面,可以利用氧化系数(OX)等无机地球化学参数和甲藻甾烷、三环萜烷、正构烷烃等有机地球化学参数判断火山岩的形成环境。不同形成环境对火山岩储层储集性能影响差异显著,陆上火山岩储集空间组合更丰富,原生储集空间更大,且淋滤溶蚀改造作用对储集性能的改善更显著,其储集性能好于水下火山岩。该研究结果总结了不同形成环境火山岩的判别标志及对储层储集性能影响机理,为火山岩储层岩石成因环境分析及岩相古地理研究提供了依据。
The forming environment is one of the important factors affecting the development of volcanic rock reservoirs. Accurately judging the forming environment of volcanic rocks plays an important supporting role in guiding volcanic rock oil and gas exploration. Based on the macro-micro petrological and geochemical characteristics of Carboniferous volcanic rocks in the eastern Junggar Basin, it is found that the volcanic forming environment can be identified from petrological facies, paleontological and geochemical facies. Subaerial and underwater volcanic rocks have different lithologic assemblages and macro-and micro-structural features, and various marine fossils such as brachiopods are typical signs of the formation of volcanic rocks in underwater environments. In terms of geochemistry, inorganic geochemical parameters such as oxidation index, etc., and organic geochemical parameters such as dinosterane, tricyclic terpenes, and n-alkanes can be used to determine the formation environment of volcanic rocks. Different forming environments have significant differences on the storage performance of volcanic rock reservoirs. Subaerial volcanic rock has more abundant storage space assemblages,larger primary storage space, and more significant improvement in storage performance due to leaching-dissolution reformation, so its storage performance is better than that of underwater volcanic rocks. The results of this study summarize the discriminative signs of volcanic rocks in different forming environments and their influence mechanism on reservoir performance, and provide a basis for the analysis of volcanic rock reservoir petrogenetic environment and lithofacies paleogeography.
作者
王剑
陈俊
陈锐兵
刘向军
刘金
连丽霞
马聪
WANG Jian;CHEN Jun;CHEN Ruibing;LIU Xiangjun;LIU Jin;LIAN Lixia;MA Cong(Research Institute of Experiment and Testing,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;Xinjiang Laboratory of Petroleum Reserve in Conglomerate,Karamay 834000,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2022年第11期1785-1797,共13页
Natural Gas Geoscience
基金
国家科技重大专项“准噶尔盆地岩性地层油气藏分布规律与目标评价”(编号:2017ZX05001-004)
中国石油重大科技专项“准噶尔盆地油藏富集规律与勘探技术研究与应用”(编号:2017E-0401)联合资助.
关键词
火山岩
形成环境
储集性能
石炭系
准噶尔盆地
Volcanic rock
Forming environment
Reservoir performance
Carboniferous
Junggar Basin
作者简介
王剑(1984-),男,湖北当阳人,高级工程师,博士,主要从事油气地质、沉积储层等研究.E-mail:wangjian_2605@126.com.
