摘要
综合普通岩石薄片、铸体薄片、电子探针、X衍射、扫描电镜等多种资料,对塔里木盆地塔北隆起塔河油田石炭系卡拉沙依组储层特征、成岩作用、孔隙类型及物性特征进行了探讨,并就储层物性控制因素进行了讨论。结果表明:研究区石炭系卡拉沙依组储层主要为潮坪沉积的中—粗粒岩屑石英砂岩、长石石英砂岩,其次是岩屑长石砂岩;虽然储层岩石现今埋深达5 000m,但其孔隙度和渗透率平均值分别为9.93%和34.46×10-3μm2,属于中孔中渗储层,储层孔隙主要为粒间碳酸盐胶结物溶蚀孔隙;砂岩深埋优质储层的主要原因与成岩序次和后期碳酸盐胶结物溶蚀有关,早期碳酸盐胶结抑制了压实作用,后期的碳酸盐胶结物溶蚀为储层提供了大量储集空间;成岩序次是控制该地区储层物性的关键,溶蚀作用是前提,沉积条件是基础。
Based on examination and analysis of ordinary thin sections, casting sections, SEM and X-ray diffractions, the characteristics of reservoir and physical properties, diagenesis and pore type in Kalashayi Formation of Carboniferous from Tahe oilfield of Tabei uplift, Tarim Basin were analyzed, and controlling factors on physical properties of sandstones were discussed. The results showed that the reservoirs in Kalashayi Formation of Carboniferous from the study area were mainly medium-coarse lithic quartz sandstone and feldspar quartz sandstone deposited in tidal flat, and secondly lithic feldspar sandstone; although the present depth of reservoir was 5 000 m, the average values of porosity and permeability were 9. 93~ and 34. 46 × 10^-3 μm^2 respectively, and they were moderate; the main diagenesis included compaction, cementation and dissolution during burial, and the main type of reservoir pore was dissolution pore with intergranular carbonate cement; deep burial reservoir with high quality in sandstone was related with diagenesis process and later dissolution of carbonate cement, the early carbonate cementationrestrained the compaction, and the later dissolution of carbonate cement supplied a lot of reservoir space; diagenesis process was the key to control the reservoir physics property, dissolution was precondition, sedimentary environment was foundation.
出处
《地球科学与环境学报》
CAS
2013年第1期48-55,共8页
Journal of Earth Sciences and Environment
基金
国家自然科学基金项目(41072104)
国家重点基础研究发展计划("九七三"计划)项目(2011CB201104)
关键词
储层
物性
控制因素
砂岩
石炭系
卡拉沙依组
塔河油田
塔里木盆地
reservoir
physical property
controlling factor
sandstone
Carboniferous
KalashayiFormation
Tahe oilfield
Tarim Basin
作者简介
钟大康（1961-），男，四川资中人，教授，博士研究生导师，理学博士，E—mail：zhongdakang@263．net。
