塔河油田奥陶系碳酸盐岩储层古溶洞充填特征与垂向物性分布

塔河油田古岩溶储层的储集性能与溶洞内部充填特征密切相关。通过对露头、岩心和成像测井的直接认知，区分了溶洞内部的充填物类型和充填程度，开展了溶洞充填特征的识别研究，最后建立了溶洞充填结构模式，并探讨了基于充填特征的古溶洞物性分布特征。研究认为，溶洞充填物主要有搬运型沉积物、垮塌型堆积物及化学型胶结物三种类型，溶洞充填程度可分为部分充填型溶洞和全充填型溶洞；不同充填特征的溶洞表现出不同的测井响应特征；溶洞的充填结构具有“多期次、准层状”的特点，垮塌角砾岩充填多与砂泥混积，物性较差，砂泥岩充填段物性相对较好，整体孔隙度分布表现出多段韵律叠加的特征。

The Ancient Karst Cave Filling Characteristics and Physical Property Distribution of the Fracture-Cave Reservoirs in Ordovician of Tahe Oilfield

The reservoir property of kast cave in Tahe oilfield was closely related to its inner filling characteristics. Based on direct cognition of outcrop,core and imaging logging,made clear of the inner filler′s type and filling de-gree of the karst cave,conducted the research of cave filling characteristics identification,finally established the ca-ve filling structure mode and probes into the physical distribution characteristics of ancient kast cave. Research sug-gested that the karst cave fillings mainly had three types：portative type sediments,collapse type deposits and chemical type cement. Cave filling degree was divided into partial filling karst cave and full filling type cave. Differ-ent filling characteristics of karst cave showed different logging response characteristics. Karst cave filling structure had a characteristics of multiple phase and quasi-laminar. The collapse breccia fillings were mainly mixed with ar-enaceous pelitic sediments,it had poor physical properties,while sand and shale filling period had a relatively good physical properties,the overall porosity distribution showed more superposition of rhythm characteristics.