摘要
通过岩芯观察、岩石薄片鉴定和地球化学分析测试,对四川盆地中部中三叠统储层的岩石学特征、储集空间类型、物性特征和储层类型及其形成机理进行了详细研究,将储层划分为风化壳喀斯特型、滩相白云岩型和热液白云岩型3类。风化壳喀斯特型储层在磨溪以东—龙女寺以西地区的雷三—雷四段地层较为发育,主要受构造抬升作用和后期成岩作用等控制;滩相白云岩型储层主要发育在底部(T2l1),储集岩性主要为砂屑白云岩、残余砂屑白云岩等颗粒白云岩类,储集空间以晶间孔和粒间粒内溶孔为主,属中孔低渗型储层,其形成发育明显受沉积相和成岩作用控制;热液矿物及其组合的普遍存在,可能暗示研究区存在与构造断裂活动密切相关的热液白云岩型储层。
The lithological characteristic,reservoir space types,physical features,reservoir types and their formationmechanisms of middle Triassic reservoir rocks in central Sichuan basin are studied through massive coreobservation,thin section analysis and geochemical testing. The middle Triassic reservoir can be divided into threetypes,which are weathering karst reservoir,bank-facies dolomite reservoir and hydrothermal dolomite reservoir.This paper analyzes that the most advantageous district of karst reservoir rock of the east of Moxi and the west ofLongnüsi,which is influenced by tectonic uplifting and late diagenesis. The bank-facies dolomite reservoir rockis mainly located in the base of Leikoupo Formation (T2l11),which was mainly developed in Moxi gasfield. Thereservoir rocks are chiefly diverse grain dolostone. Intercrystal pores and solution pores are their main reservoir space.The reservoir is the medium porosity and low permeability,controlled by facies and diagenesis. Hydrothermalminerals are pervasive in the studied area,which implies that there may be reservoir rock related to hydrothermaldolostone in the central Sichuan Basin.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第6期13-19,202,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
川中
中三叠统
雷口坡组
储层特征
储层类型
Central Sichuan Basin
Middle-Triassic
Leikoupo Formation
reservoir characteristics
reservoir types
