周口坳陷谭庄凹陷下白垩统低孔低渗碎屑岩储层特征及成因分析  

Characteristics and genesis of clastic reservoir with low porosity and low permeability of Lower Cretaceous in Tanzhuang Sag

作　　者：张琴[1] 朱筱敏[1] 刘畅[1] 季汉成[1] 陈祥[2] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石化河南石油勘探局,河南南阳473132

出　　处：《岩性油气藏》2014年第4期44-49,共6页Lithologic Reservoirs

基　　金：国家自然科学基金项目"页岩气储层微观孔隙发育机制及其演变定量模拟"(编号:ZX20130157);中国石油大学(北京)基本科研业务基金项目"低孔;低渗碎屑储层成因机理研究--以谭庄凹陷下白垩统为例"(编号:KYJJ2012-01-29)联合资助

摘　　要：根据岩心、薄片、扫描电镜等分析化验资料确定谭庄凹陷下白垩统储层平均孔隙度为6.1%,平均渗透率为10.5 mD,为低孔、低渗碎屑岩储层。除巴1井外,其他各井从上部商水组向下到巴村组,随着埋藏深度增大,孔隙度和渗透率基本呈下降趋势。下白垩统储层质量主要受沉积条件、成岩作用及构造作用的影响。较低的成分和结构成熟度、较强的压实作用和胶结作用以及较弱的溶蚀作用是导致储层低孔、低渗的根本原因,而构造作用形成的裂缝均被矿物充填,对储层物性改善不大。The average porosity and average permeability of clastic reservoir of Lower Cretaceous in Tanzhuang Sag are respectively 6.1% and 10.5 mD based on the data of cores, thin section, and scanning electron microscope, which means that the reservoir belongs to low porosity and low permeability reservoir. Porosity and permeability decrease from Shangshui Formation to Bacun Formation with depth getting deeper except in Ba 1 well. The reservoir properties of the Lower Cretaceous are mainly influenced by depositional conditions, diagenesis and tectonization. Low textural and compositional maturity, strong compaction and cementation and weak dissolution are composed of the essential and significant factors for the low porosity and low permeability, while fractures caused by tectonization mostly are filled by minerals as a result of little improvement of the reservoir properties.

关 键 词：低孔、低渗碎屑岩储层 主控因素 成岩相 下白垩统 谭庄凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]