川东北五宝场地区侏罗系沙溪庙组储层特征及主控因素  

Reservoir characteristics and main controlling factors of Jurassic Shaximiao Formation in Wubaochang area,northeastern Sichuan Basin

作　　者：张晓丽 王小娟 张航[2] 陈沁 关旭 赵正望 王昌勇[4] 谈曜杰 ZHANG Xiaoli;WANG Xiaojuan;ZHANG Hang;CHEN Qin;GUAN Xu;ZHAO Zhengwang;WANG Changyong;TAN Yaojie(Research Institute of Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China;Northeast Sichuan Gas District,PetroChina Southwest Oil and Gas Field Company,Dazhou 635000,Sichuan,China;Development Division,PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,成都610041 [2]中国石油西南油气田公司川东北气矿,四川达州635000 [3]中国石油西南油气田公司开发事业部,成都610041 [4]成都理工大学沉积地质研究院,成都610059

出　　处：《岩性油气藏》2024年第5期87-98,共12页Lithologic Reservoirs

基　　金：中国石油股份公司科技专题“致密气勘探开发技术研究—致密气新区新领域资源潜力与富集规律研究——四川盆地新区新领域致密气成藏主控因素与有利目标优选”(编号:2021DJ2101)资助。

摘　　要：川东北地区侏罗系沙溪庙组致密砂岩具有较大的勘探潜力。利用铸体薄片、扫描电镜、阴极发光、X射线衍射、孔渗、压汞和包裹体均一温度等分析测试资料,对川东北五宝场地区侏罗系沙溪庙组储层特征进行了研究,并结合地震解释成果分析了储层致密化原因以及优质储层分布特征。研究结果表明:(1)川东北五宝场地区侏罗系沙溪庙组砂岩储层具有较高的长石和岩屑含量,分选和磨圆一般,结构成熟度和成分成熟度均较低,储层孔隙度大多小于6%,渗透率大多小于1 mD,孔渗相关性及孔隙结构均较差,主要发育裂缝-孔隙型储层。(2)研究区侏罗系沙溪庙组储层处于中成岩阶段A期,钙质胶结作用导致储层局部致密化,埋藏压实作用和浊沸石胶结是导致沙溪庙组砂岩致密化的主要原因,油气在储层致密化前后持续充注。(3)早期绿泥石环边胶结、大气水的淋滤以及构造破裂作用是研究区主要的建设性成岩作用,对原生粒间孔的保存、次生溶孔的形成和提高储层渗透性具有重要意义。(4)沉积微相、成岩作用和构造破裂作用共同控制了优质储层的分布,具早期绿泥石环边胶结、浊沸石弱胶结、长石溶蚀、裂缝发育的水下分流河道是相对优质砂岩储层的主要发育区。The tight sandstone of Jurassic Shaximiao Formation in northeastern Sichuan Basin has great exploration potential.The reservoir characteristics of Jurassic Shaximiao Formation in Wubaochang area of northeastern Sichuan Basin were studied by using analysis and testing data such as cast thin sections,scanning electron micro-scopy,cathodoluminescence,X-ray diffraction,properties,mercury injection and homogenization temperature of inclusions.Combined with seismic interpretation results,the reasons for reservoir densification and the distribution characteristics of high-quality reservoirs were analyzed.The results show that:(1)The sandstone reservoirs of Jurassic Shaximiao Formation in Wubaochang area of northeastern Sichuan Basin are characterized by high contents of feldspar and rock debris,general sorting and roundness,low structural maturity and compositional maturity,poor porosity and permeability correlation and poor pore structure,with reservoir porosity mostly less than 6%,permeability mostly less than 1 mD,and mainly developed fractured-porous reservoir.(2)The reser-voirs of Jurassic Shaximiao Formation in the study area are in the middle diagenetic stage A.Calcareous cementation leads to local densification of the reservoirs,while burial compaction and laumontite cementation are the main causes for sandstone densification in Shaximiao Formation.Oil and gas continued to charge before and after reservoir densification.(3)Early chlorite rim cementation,atmospheric water leaching and tectonic rupture are the main constructive diagenesis,which are of great significance for the preservation of primary intergranular pores,the formation of secondary dissolved pores and the improvement of reservoir permeability.(4)Sedimentary microfacies,diagenesis and tectonic rupture control the distribution of high-quality reservoirs.The underwater distributary channel with early chlorite rim cementation,weak laumontite cementation,feldspar dissolution and fractures developed is the main development area of high-quality sandstone

关 键 词：致密砂岩 水下分流河道 绿泥石环边胶结 压实作用 浊沸石胶结 构造破裂作用 沙溪庙组 侏罗系 五宝场地区 四川盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]