川中龙女寺—合川栖霞组碳酸盐岩储集层特征及主控因素  

Characteristics and main controlling factors of carbonate reservoirs in Qixia Formation,Longnvsi-Hechuan block,central Sichuan Basin

作　　者：王蓓 朱占美 刘微 张锐铎 狄贵东 戴鑫 刘林清 袁山 WANG Bei;ZHU Zhanmei;LIU Wei;ZHANG Ruiduo;DI Guidong;DAI Xin;LIU Linqing;YUAN Shan(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041

出　　处：《天然气勘探与开发》2024年第5期64-75,共12页Natural Gas Exploration and Development

基　　金：中国石油集团公司重大科技专项(编号:2023ZZ16-03)。

摘　　要：四川盆地龙女寺—合川区块中二叠统栖霞组气藏是川中地区薄储集层、强非均质碳酸盐岩气藏的典型代表,该气藏储层具有低孔隙、低渗透的物性特征。仅依据静态资料对储集层精细表征存在的不确定性,制约了气藏井位目标部署及科学、高效开发。利用岩心、岩屑、薄片、地球物理等资料,在明确储集层基本特征基础上,依据物性参数和孔隙结构参数,结合气藏地球物理响应和生产动态特征,形成了储集层分类评价体系。进而刻画了不同类型储集层分布和储集层发育模式,明确了储集层发育主控因素。研究结果表明:(1)龙女寺—合川区块栖霞组气藏储集岩以晶粒云岩、颗粒云岩、灰质云岩为主,主要储集层类型为裂缝-孔洞型和孔洞型;(2)以物性参数和孔喉结构参数作为主要的储集层分类评价指标,形成了具有针对性的储集层分类评价标准,明确了研究区优质储集层类型主要为Ⅰ类和Ⅱ类储集层,以及不同储集层类型的空间展布特征;(3)气藏发育5个储集层厚值区,栖二上亚段储集层发育优于栖二下亚段,优质储集层纵向呈薄层叠置,平面连片分布,形成了“准同生期滩体+岩溶”与“准同生期滩体+岩溶+断裂”两类优质储集层发育模式;(4)沉积前古地貌斜坡为有利的滩体发育区,滩相沉积作用控制储集层分布,岩溶作用是优质储集层形成的关键,构造作用改善栖霞组储渗能力,有利于优质储集层的形成。As a typical example of thin carbonate reservoirs with strong heterogeneity,the Middle Permian Qixia Formation gas reservoir in the Longnvsi-Hechuan block of the central Sichuan Basin has the characteristics of low porosity and permeability.The uncertainty in the fine reservoir characterization only using static data restricts the well deployment,and rational and efficient development of the gas reservoir.The basic reservoir characteristics were clarified through the core,cutting,thin section and geophysical data.Subsequently,depending on the parameters of physical properties and pore structure,together with the geophysical response and production dynamic characteristics of the gas reservoir,a reservoir classification and evaluation system was established to delineate the distribution and development patterns of different types of reservoirs,and identify the main factors controlling reservoir development.The results show that,(i)the reservoir rocks in Qixia Formation are mainly composed of granular dolomites,granular limestones,and limy dolomites,and fractured-vuggy and vuggy reservoirs are most common;(ii)according to the specific reservoir classification and evaluation system with the parameters of physical properties and pore structure as key indicators,the high-quality reservoirs in the study area are categorized as Type I andⅡ,with their spatial distribution characteristics determined;(iii)five large-thickness zones are developed in the gas reservoir;the development of reservoirs in the upper submember of the second member of Qixia Formation are better than that in the lower part;high-quality reservoirs as thin beds are superimposed vertically and continuous horizontally,forming two development patterns of high-quality reservoirs,i.e.penecontemporaneous beach+karst,and penecontemporaneous beach+karst+fault;and(iv)the pre-depositional paleogeomorphic slope is a favorable zone for beach development,the beach deposition controls the reservoir distribution,the karstification is a key driver for the formation o

关 键 词：四川盆地 栖霞组 强非均质性 碳酸盐岩气藏 储集层分类 储集层主控因素 

分 类 号：P618.13[天文地球—矿床学]