摘要
根据岩石薄片、铸体薄片、扫描电镜、X-射线衍射、压汞等资料,结合地质、物性分析资料,对尕斯库勒砂西区块N1—N21储层特征及Ⅱ号断层上、下盘的差异进行了综合分析。研究认为:研究区的储层为一套碎屑岩储层,经历了以压实、胶结作用为主的破坏性成岩作用和以溶蚀、构造作用为主的建设性成岩作用,储层成岩阶段处于早成岩B亚期—晚成岩A1亚期;储层孔隙类型有粒间孔、粒内孔、裂缝、贴粒缝等4类,并以粒间孔为主;N1—N21储层属中孔、低渗储层,储集性能中—差;分流河道砂体是该区最主要的储集砂体,其物性也明显好于其它微相砂体。Ⅱ号断层上盘成分成熟度明显小于下盘、胶结物平均含量低于下盘;上盘以长石岩屑砂岩为主,下盘以长石砂岩为主;上盘粒间孔较下盘发育,而下盘裂缝较上盘发育;上盘主要为中孔、中渗储层类型,下盘主要为低孔、低渗储层类型。
The data of thin section, cast slice, SEM, X-ray diffraction, mercury injection combining with geological information and physical properties analysis are applied to analyze the characteristics of N1-N2^1 and the difference between the upper wall and lower wall of fault Ⅱ in Shaxi zone. The result shows that the reservoir in the study area is clastic reservoir which experienced destructive diagenesis of compaction and cementation and constructive diagenesis of dissolution and tectonism. The diagenetic stage is in the period from early diagenesis subage B to late diagenesis subage A1. The pore structure types are intergranular pore, intragranular pore, and fracture etc. The reservoir of N1-N2^1 is middle pore and low permeability reservoir with poor property. Distributary channel sand bodies are the foremost reservoirs in the study area. The compositional maturity of the lower wall is much better than that of the upper wall of fault Ⅱ , however the cement content is on the＇contrary. The sandstone in upper wall is mainly the feldspathic litharenite, and in the lower wall it is mainly the arkose. The pore in upper wall is mainly intergranular pore, however, fracture developed well in lower wall. The reservoir is medium porosity and medium permeability in upper wall but low porosity and low permeability in lower wall.
出处
《岩性油气藏》
CSCD
2007年第4期34-39,共6页
Lithologic Reservoirs
关键词
成岩作用
储集层
孔隙结构
孔喉参数
尕斯库勒砂西区块
柴达木盆地
diagenesis
reservoir
pore structure
pore throat parameters
Shaxi zone of Gasikule Oilfield
Qaidam Basin
