克拉玛依油区沸石类矿物特征及其与油气的关系

MINERALOGICAL CHARACTERISTICS OF ZEOLITE MINERALS AND THEIR BEARINGS TO THE RESERVOIR BEDS IN THE KARMAY OIL FIELD

克拉玛依油区储层中共发现6种沸石和一种与沸石演化有关的钠长石。本文通过沸石矿物特征及分布规律的研究认为;沸石及沸石的组合在纵向上存在着一定的分带性,与埋藏成岩关系极为密切。方沸石和方沸石十片沸石带为早成岩期B阶段形成;片沸石十浊沸石带主要为晚成岩期A阶段形成;浊沸石+钠长石带为晚成岩期B—c阶段形成。方沸石的钠长石化和方沸石溶蚀对储层贡献较大。另外对沸石分带中的一些重叠现象等进行了初步探讨。

Six types of zeolite minerals and a kind of albite associated with zeolite evolution have been recognized in the reservoir beds in the Karamay oil field. On the basis of mineralogical characteristics and distribution, the author contends that zeolite and zeolitic associations are longitudinally zoned and closely related to burial diagenesis. The analcime and analcime+heulandite zones were formed during Stage B of early diagenesis; the heulandite+laumontite zone during Stage A of late diagenesis, and the laumontite+albite zone during Stages B to C of late diagenesis. Albitization and erosion of analcime contribute a lot to the reservoir quality. In addition, some superimposed phenomena in the heulandite zonation are also discussed in this paper.