松辽盆地德惠断陷营城组凝灰岩储层地质特征  

Geological Characteristics of Tuff Reservoir of Yingcheng Formation in Dehui Fault Depression,Songliao Basin

作　　者：迟唤昭 赵玉婷 刘财[3] 王桐 胡佳[4] 杨松杉 Chi Huanzhao;Zhao Yuting;Liu Cai;Wang Tong;Hu Jia;Yang Songshan(School of Prospecting&Surveying Engineering,Changchun Institute of Technology,Changchun 130021,China;Qingdao Geo-Engineering Surveying Institute(Qingdao Geological Exploration and Development Bureau),Qingdao 266100,Shandong,China;College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China;PetroChina Jilin Oilfield Company,Songyuan 138000,Jilin,China)

机构地区：[1]长春工程学院勘查与测绘工程学院,长春130021 [2]青岛地质工程勘察院(青岛地质勘查开发局),山东青岛266100 [3]吉林大学地球探测科学与技术学院,长春130026 [4]中国石油吉林油田分公司,吉林松原138000

出　　处：《吉林大学学报（地球科学版）》2022年第1期55-67,共13页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41790453,41972313);吉林省科技发展计划项目(20200403068SF,20210101108JC)。

摘　　要：为了探讨储层微观孔隙特征及产能规律,给火山岩油气开发提供有利依据,通过对松辽盆地德惠断陷营城组凝灰岩进行岩心描述,结合测井、地震资料,X衍射、扫描电镜、物性、含气性等数据进行构造背景分析,开展了凝灰岩储层地质特征综合研究。结果表明:研究区营城组凝灰岩矿物成分主要为石英、长石和黏土矿物,凝灰岩发生了风化蚀变作用,火山灰偏中性;区内凝灰岩在横向上分布广泛,在纵向上由多个叠合单元构成,测井曲线具"三高两低"的特征。按照凝灰岩的发育规模和含气性特征将火山机构分成小规模、中规模和大规模凝灰岩火山机构3类。凝灰岩储层为中孔-低渗型储层,为低产储层,其低产因素有两个:一是黏土矿物(尤其是伊蒙混层)质量分数较高,二是受深部压实作用影响。凝灰岩储层次生孔隙所占比例大于80%,主要储集空间类型为溶蚀孔和溶蚀缝,溶蚀孔主要以长石溶蚀孔和基质溶蚀孔为主,裂缝发育是形成凝灰岩优质储层的关键因素,在中浅部(尤其是构造高部位)地区易形成高产气层,利用测井曲线(补偿中子+密度)可有效预测凝灰岩储层。Through the tuff core description,well logging,seismic data,X-ray diffraction,scanning electron microscopy,physical properties,and other test data of Yingcheng Formation in Dehui fault depression of Songliao basin,combined with the structural background analysis,the authors studied the geological characteristics of tuff reservoirs.The results show that the mineral components of the tuff in Yingcheng Formation are mainly quartz,feldspar,and clay minerals.Tuff is widely distributed in the region,and composed of several superimposed units in vertical direction that underwent weathering and alteration.The logging curve has three peaks and two valleys.According to the tuff scale and gas-bearing characteristics,the volcanic edifice can be classified into three categories:Small tuff volcanic edifice,large tuff volcanic edifice,and super large tuff volcanic edifice.The tuff reservoir has middle porosity and low permeability.There are two factors of low yield:The first one is higher content of clay minerals(especially the imam mixed layer),and the second one is compaction.The porosity of tuff reservoir layer accounts for more than 80%.The main reservoir space types are dissolved pores and dissolved fractures,and the dissolved pores are mainly feldspar dissolved pores and matrix dissolved pores.The fracture development is a key factor in the formation of tuff reservoir,and there is a high possibility to find high-yield gas reservoirs in the shallow and middle areas(especially in the high part of the structure).Using logging curve(neutron and density) can predict tuff reservoir effectively.

关 键 词：储层特征 火山机构 凝灰岩 营城组 德惠断陷 

分 类 号：P544[天文地球—构造地质学]