松辽盆地南部查干花次凹下白垩统火山岩储层特征与发育规律  

Characteristics and development regularity of Lower Cretaceous volcanic rock reservoirs in Chaganhua subsag,southern Songliao Basin

作　　者：冷庆磊 朱建峰[1] 刘玉虎[1] LENG Qinglei;ZHU Jianfeng;LIU Yuhu(Northeast Oil&Gas Branch of SINOPEC,Changchun 130062,China)

机构地区：[1]中国石化东北油气分公司,长春130062

出　　处：《世界地质》2023年第3期527-535,共9页World Geology

基　　金：中国石化重点科技项目(P21104)。

摘　　要：基于岩心及其薄片资料,结合地震、物性测试,探究长岭断陷查干花次凹火石岭组火山岩储层发育特征和发育规律。研究表明火山岩发育3个喷发期次、4大类岩性:期次1为陆上喷发,以溢流相夹爆发相为主;期次2为水陆过渡环境喷发,发育大量火山沉积相;期次3为水下环境喷发,以水下爆发相为主。火山岩储层主要发育在期次2火山沉积相的凝灰质砂岩和期次3水下爆发相的中-粗粒凝灰岩中。中-粗粒凝灰岩储层储集空间以大量脱玻化孔为主,凝灰质砂岩储层储集空间主要为溶蚀孔,2种类型储层均为微孔型储层,孔隙中值为3.8%,渗透率中值为0.03×10^(-3)μm^(2)。期次2凝灰质砂岩储层空间分布广,储层呈层状发育;期次3中-粗粒凝灰岩储层在空间上呈透镜状发育在火山喷发中心附近。Based on the core and thin section data,combined with the seismic and physical properties tests,the characteristics and development regularity of the volcanic rock reservoirs in the Huoshiling Formation of Chaganhua subsag,Changling fault depression have been studied.The results show that the volcanic rocks were erupted at three stages with four types of lithology.Stage 1 is a subaerial eruption,mainly dominated by effusive facies and explosive facies.Stage 2 is developed in a transitional eruption environment with a large number of volcanic-sedimentary facies.Stage 3 is a subaqueous environment eruption,which is dominated by subaqueous explosive facies.Volcanic rock reservoirs are mainly developed in tuffaceous sandstones of the volcanic sedimentary facies(stage 2)and medium-coarse grained tuffs of the subaqueous explosive facies(stage 3).The reservoir space of middle-coarse grained tuff reservoir is dominated by a large number of devitrified pores,while the reservoir space of tuffaceous sandstone reservoir is dominated by dissolution pores.Both types of reservoirs are microporous reservoirs,with a medium pore value of 3.8%and a median permeability value of 0.03×10^(-3)μm^(2).The tuffaceous sandstone reservoirs of stage 2 are widely distributed and stratified.The middle-coarse grained tuff reservoirs of stage 3 are developed lenticular in space and developed near the volcanic eruption center.

关 键 词：水下火山喷发 储层特征 火石岭组 查干花次凹 长岭断陷 松辽盆地南部 

分 类 号：P618.13[天文地球—矿床学]