摘要
塔河油田东南斜坡区奥陶系具一定的勘探开发潜力,岩溶储层是其主要储集类型。本文通过50余口井1 000余米奥陶系岩芯、300余块岩石薄片的观察及200余件样品的地化资料的分析整理,研究了奥陶系岩溶储层的形成机制。指出特殊岩相条件下同生期大气水溶蚀形成滩相溶蚀孔隙型储层;加里东中期与海西早期岩溶作用叠加改造形成岩溶缝孔洞型储层和岩溶洞穴型储层;海西晚期热液溶蚀作用对岩溶缝洞型储层也有一定程度改造。断裂活动控制下的岩溶及热液溶蚀作用是该区的主要储层形成机制,既受层控又受断控,表现为不同井区储层发育及分布特征不同。盐体北边界附近,受特定沉积相带和古地貌控制,多种类型储层发育;由北而南的贯穿性断裂带上,受多期次断裂活动控制,多类型、多期次储层发育;而断裂带之间,储层发育相对较差。这对于区内奥陶系储层的评价和勘探开发部署具有重要意义。
Ordovician in the southeast slope area of Tahe oilfield is a potential reservoir with karst as the main reservoir types. Based on analysis of logging data of 50 wells, oil production test, geophysical data, drilling cores and thin-section observation, the formation mechanism of Or- dovician karst reservoir is determined. The dissolution-pore reservoir was formed in syn-sedimen- tary karstification under special conditions;the fractured reservoirs and karst cave reservoirs were formed by superimposed karstification in the middle Caledonian and early Hercynian Period. Hy- drothermal dissolution further reformed the Late Hercynian karst and hydrothermal dissolution through faults is the main reservoir formation mechanism in the area, showing distinct features of fault-controlled and stratabound controlled reservoirs. Karst reservoir development and distribu- tion are different from place to place. In the north,various reservoirs are developed and controlled by sedimentary facies and paleogeomorphology. In the north-south trending fault belt, various res- ervoirs are controlled by faulting activity. The study is of important significance for reservoir eval- uation, exploration and development.
出处
《矿物岩石》
CAS
CSCD
北大核心
2012年第1期107-115,共9页
Mineralogy and Petrology
关键词
塔河油田东南斜坡区
奥陶系
岩溶储层
储层形成机制
储层发育分布模式
southeast slope area in Tahe Oilfield
Ordovician
karst dissolution reservoir
reser voir formation mechanism
reservoir development mode of distribution
