查干凹陷下白垩统碎屑岩储层成岩演化与油气成藏  

Diagenetic Evolution and Oil-Gas Accumulation from Clastic Rock of Lower Cretaceous in Chagan Depression

作　　者：岳伏生[1] 马龙中国石油勘探开发研究院西北分院 李天顺[2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油勘探开发研究院西北分院,兰州730020

出　　处：《沉积学报》2002年第4期644-649,共6页Acta Sedimentologica Sinica

摘　　要：查干凹陷轻质低硫成熟原油的发现显示出查干凹陷良好的油气勘探前景。低成分成熟度和低结构成熟度、高岩屑含量和高填隙物含量、多填隙组分和多胶结类型是查干凹陷下白垩统碎屑岩储层的岩石学特征 ,碳酸盐胶结物的选择性溶蚀、火山岩呈似层状存在于地层中对下伏碎屑岩压实作用的减缓是查干凹陷特低孔特低渗储层能够形成较为发育的次生溶蚀孔隙并成为有效储层的原因 ,受岩性控制、有利构造环境是查干凹陷油气成藏的特点 ,寻找储层形成的有利沉积相带和易于成岩作用改造、发育次生溶蚀孔隙而且物性相对较好的砂体 。The discovery of the mature crude oil of low sulfur and high quality shows prospecting value for oil gas in Chagan Depression. The clastic rock reservoirs are characterized by low maturities of composition and texture, high contents of rock debris and filling materials, multi composition of filling materials and multi type cementation. The selective solution of carbonate cement and the deceleration of layered volcanic rock for the compaction in clastic rock resulted in the development of secondary pores in low porosity and permeability clastic rock. The distribution of oil layers in the reservoirs is controlled by the advantageous sand body distribution in the favorable sedimentary facies zones, the sections where secondary pore developed and the structural type.

关 键 词：碎屑岩 储层 油气在藏 下白垩统 查干凹陷 成熟度 油气勘探 成岩作用 

分 类 号：P618.130.2[天文地球—矿床学] T[天文地球—地质学]