歧北斜坡沙三段碎屑岩储集性能及其影响因素  

Characteristics and key factors of clastic reservoirs in the third member of Shahejie Formation in Qibei slope

作　　者：汤戈[1] 柳飒[1] 

机构地区：[1]中国石油大港油田公司,天津300280

出　　处：《地质学刊》2016年第4期615-623,共9页Journal of Geology

基　　金：中国石油重大科技专项"歧口凹陷大油气田形成条件及富集规律研究"(2008E-0601)

摘　　要：基于物性、薄片、压汞、扫描电镜、X射线衍射等资料,分析了歧口凹陷歧北斜坡沙三段储集性能及其影响因素。结果表明:歧北斜坡沙三段主要发育以岩屑长石砂岩、长石岩屑砂岩为主的辫状河三角洲沉积体系,储集孔隙以粒间溶孔、粒内溶孔、铸膜孔等次生孔隙为主;碎屑岩储集物性受物源供给、沉积相带、成岩作用三大因素控制,物源供给与沉积相带主要控制浅层(<3 000 m)碎屑岩原生储集性能,成岩作用与异常高压主要控制中深层(>3 000 m)碎屑岩次生储集孔隙。多种因素共同作用促使沙三段纵向上发育了4个异常孔隙带,生成了油气储集成藏的重要目标层段。This work discussed the reservoir properties and influencing factors of the third member of Shahejie Formation clastic reser- voirs by comprehensive study on rock physical properties, thin section identification, mercury injection, SEM and X-ray diffraction da- ta. The results show that a number of large braided river delta front sand bodies were developed in Qibei slope,which are mainly lithic feldspathic sandstone and feldspar lithic sandstone. The major reservoir space is mainly secondary pores of intergranular dissolved pore, intragrauular dissolved pore and granular molding pore. The physical properties of clastic reservoirs are constrained by provenance, sed- imentary facies belt and diagenesis. The provenance and sedimentary facies belt mainly control original reservoir properties of shallow clastic reservoirs（ 〈3 000 m）, while diagenesis and abnormal high pressure control secondary reservoir pores of medium-deep clastic reservoirs（ 〉3 000 m）. There are four abnormally high pore zones influenced by combined factors in the third member of Shahejie For- mation in Qibei slope, which are all important intervals of hydrocarbon reservoir zones.

关 键 词：歧北斜坡 沙三段 碎屑岩 物源供给 沉积相带 成岩作用 

分 类 号：P588.212.3[天文地球—岩石学] P618.130.21[天文地球—地质学]