松辽盆地南部断陷层火山岩储层特征及油气成藏主控因素  

Volcanic reservoir characteristics and hydrocarbon accumulation control factors of rift depressions in southern Songliao Basin

作　　者：李瑞磊[1] 杨立英[2] 朱建峰[1] 刘玉虎[1] 徐文[1] 李忠博[1] 樊薛沛[1] 冷庆磊 张婷婷[1] LI Ruilei;YANG Liying;ZHU Jianfeng;LIU Yuhu;XU Wen;LI Zhongbo;FAN Xuepei;LENG Qinglei;ZHANG Tingting(Sinopec Northeast Oil and Gas Branch,Changchun 130062,China;Applied Technology College,Jilin University,Changchun 130061,China)

机构地区：[1]中国石化东北油气分公司,吉林长春130062 [2]吉林大学应用技术学院,吉林长春130061

出　　处：《地学前缘》2023年第4期100-111,共12页Earth Science Frontiers

基　　金：中国石化科技项目“松南断陷火山岩气藏一体化技术研究与应用(P21104)”。

摘　　要：松辽盆地南部断陷层火石岭组中-基性火山岩广泛发育,是松辽盆地深层油气勘探的热点。本文通过宏观到微观多尺度综合分析,开展火山岩形成与分布、岩性岩相与火山机构类型、储集空间特征和油气成藏特征等方面研究,总结深层火山岩有效储层形成机制及成藏主控因素。研究表明:(1)火石岭组中-基性火山岩分布广泛,多呈低幅丘状、多期叠置连片分布;火山岩主要发育3种岩相、7种亚相;发育“孔隙+缝网”复合型有效储集空间类型;(2)火山机构控制岩性、岩相分布,决定原生孔隙的形成与分布;构造作用、溶蚀作用利于构造裂缝及次生溶蚀孔缝的形成,是控制形成优质储层的关键因素;(3)优质储层和保存条件是油气富集的主控因素。Intermediate-basic volcanic rocks of the Huoshiling Formation are widely developed in rift depressions in southern Songliao Basin.In this present study we investigated the volcanic rock distribution,lithology and lithofacies,volcanic structure types,reservoir space characteristics and gas accumulation characteristics through comprehensive multi-scale analysis,and then discussed the formation mechanism of effective reservoir space and the main controlling factors of hydrocarbon accumulation.We found that(1)intermediate-basic volcanic rocks are widely distributed in the basin mainly as multi-stage superimposed,connected low-amplitude mounds.The rock develops 3 types of lithofacies and 7 types of subfacies as well as a composite pore-fracture network-type reservoir space.(2)Volcanic structures control the lithology and lithofacies distribution,and determine the formation and distribution of primary pores;while tectonic movements and rock dissolution are conducive to the formation of structural fractures and secondary dissolution pores and fractures,and they are the key factors controlling the formation of high-quality reservoirs.(3)The reservoir control mechanism can be described by a quaternary model:The paleostructural setting during the accumulation period determines the direction of hydrocarbon accumulation;the favorable hydrocarbon generation center of the deep depression provides the material basis for the hydrocarbon accumulation and dynamic conditions;the multi-type,multi-scale pore-fracture development zones control the distribution of favorable reservoirs and determine the degree of oil and gas enrichment;and stable mudstone and late-stage weak tectonic activities provide better preservation conditions for the development of petroleum reservoirs.

关 键 词：松辽盆地南部 断陷层 火山岩 有效储层 成藏主控因素 

分 类 号：P618.130.2[天文地球—矿床学]