摘要
针对大宁—吉县地区盒8段优质储层分布不明确的问题,利用铸体薄片、X射线衍射、阴极发光、扫描电镜等手段,从岩石学与矿物学、成岩作用等方面分析储层发育特征及影响因素。结果表明:盒8段储层岩石类型主要为岩屑石英砂岩,岩性以中、粗砂岩为主;储集空间类型包括粒间溶孔、长石溶孔、岩屑溶孔以及黏土矿物晶间孔等,储层物性为低孔低渗,属于致密储层,但孔渗相关性较好;压实作用是研究区储层致密的主要因素,平均压实减孔率为80.16%,平均胶结减孔率为17.00%,溶蚀作用可改善储层物性,平均溶蚀增孔率为7.34%;优质储层并不存在于砂体中部或顶、底处,其在砂体单元内部的发育遵循“砂体中心上下两侧”分布模式;在抗压实性、溶蚀条件以及各类胶结物特性等因素影响下,优质储层多发育于石英砂岩与中、粗砂岩。该研究成果可为研究区优质储层的准确预测提供参考。
To address the problem of unclear distribution of high-quality reservoirs in He8 Member in Daning-Jixian Area,the reservoir development characteristics and influencing factors were analyzed from petrology and mineralogy,diagenesis and other aspects by using cast thin section,X-ray diffraction,cathodoluminescence and scanning electron microscope.The results show that the rock type of the He8 member reservoir is mainly lithic quartz sandstone,and the lithology is mainly of medium and coarse sandstone;the type of reservoir space includes intergranular dissolution pore,feldspar dissolution pore,lithic dissolution pore and clay mineral intercrystalline pore,etc.The reservoir has low-porosity and low-permeability physical properties,but it is a dense reservoir with good porosity-permeability correlation;the compaction is the main factor for the dense reservoir in the study area,the average compaction reduction rate is 80.16%,the average cementation reduction rate is 17.00%,the dissolution can improve the reservoir properties,the average dissolution increase pore rate is 7.34%;the high-quality reservoir does not exist in the middle or at the top or bottom of the sand body,its development in the sand unit follows the distribution pattern“Upper and lower sides of the sand body center”;under the influence of factors such as compaction resistance,dissolution conditions and various types of cementation properties,the high-quality reservoirs are mostly developed in quartz sandstone and medium and coarse sandstone.The research results can provide reference for the accurate prediction of high-quality reservoirs in the study area.
作者
郭琪琪
耳闯
赵靖舟
滕云玺
谭诗锦
沈聪敏
Guo Qiqi;Er Chuang;Zhao Jingzhou;Teng Yunxi;Tan Shijin;Shen Congmin(Xi′an Shiyou University,Xi′an,Shaanxi 710065,China;Key Laboratory of Oil and Gas Formation Geology,Shaanxi Province,Xi′an,Shaanxi 710065,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2023年第3期19-28,共10页
Special Oil & Gas Reservoirs
基金
国家自然科学基金“松辽盆地三肇凹陷扶余油层方解石胶结物形成机制及其与烃类充注的耦合关系”(41702132)。
关键词
优质储层
储层特征
成岩定量分析
盒8段
大宁—吉县地区
鄂尔多斯盆地
high-quality reservoirs
reservoir characteristics
quantitative analysis of diagenesis
He8 member
Daning-Jixian area
Ordos Basin
