辽河坳陷西部凹陷雷家地区沙四段杜三层细粒沉积岩储层特征及评价  

Reservoir characteristics and evaluation of fine-grained sedimentary rocks in E_(2)s_(4)^(d^(3)) in the Leijia area of the Western Sag,Liaohe Depression

作　　者：李阳[1,2] 李晓光[1] 陈昌[1] 崔向东[1] 赖鹏[1] 郭鹏超[1] 任铌 刘洋 戚雪晨[1] 郭美伶 LI Yang;LI Xiaoguang;CHEN Chang;CUI Xiangdong;LAI Peng;GUO Pengchao;REN Ni;LIU Yang;QI Xuechen;GUO Meiling(PetroChina Liaohe Oilfield Company,Panjin 124010,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油天然气股份有限公司辽河油田分公司,辽宁盘锦124010 [2]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《地学前缘》2025年第2期277-289,共13页Earth Science Frontiers

基　　金：辽宁省自然科学基金计划项目(2024-BS-338);中国石油天然气股份有限公司辽河油田分公司重点科技项目(2023KJXM-11)。

摘　　要：西部凹陷雷家地区沙四段杜三层沉积了以黏土、长英质、碳酸盐和方沸石矿物混合的湖相细粒沉积岩,为该区近年致密油和页岩油勘探重点对象。在前人研究基础上,使用钻井、测井、录井和分析化验等资料,并结合无监督学习方法,对研究区目的层细粒沉积岩进行分类,研究细粒岩储层基本地质特征并对其评价和有利区带预测。对303个X射线衍射全岩定量分析数据进行K-means聚类分析,将杜三层岩性划分为碳酸盐岩类、长英质混合细粒岩类和方沸石质混合细粒岩类3种类型,其中碳酸盐岩类和方沸石质混合细粒岩类具有更好的脆性特征,容易产生裂缝,并且溶孔和溶洞沿着裂缝发育,使得此类岩石储渗性能更佳,杜三层储层孔喉半径细小,分选差,均质系数小,孔隙结构较差,形成有效储层依赖微孔隙和微裂缝。基于叠合概率评价方法,将脆性指数、碳酸盐岩和方沸石质混合细粒岩厚度、裂缝密度、平均孔隙度、平均渗透率和总有机碳含量6种影响储层发育因素进行融合并评价,储层发育有利区沿湖盆长轴雷15井—雷84井—雷59井—曙90井—雷93井等井区分布。The E_(2)s_(4)^(d^(3)) layer in the Leijia area of the western sag is characterized by lacustrine fine-grained sedimentary rocks,intermixed with clay,felsic,carbonate,and analcime minerals.Recent exploration efforts have been primarily directed towards tight oil and shale oil within this region.Previous research amalgamated drilling,logging,and analytical testing data to comprehend the geological characteristics of fine-grained rock reservoirs.Employing unsupervised learning techniques,particularly K-means cluster analysis,facilitated the classification of fine-grained sedimentary rocks into distinct types based on 303 X-ray diffraction whole-rock quantitative analysis data.The lithology of the E_(2)s_(4)^(d^(3)) layer was categorized into carbonate rock type,felsic mixed fine-grained rock type,and analcitic mixed fine-grained rock type.Notably,carbonate rocks and analcite mixed fine-grained rocks exhibit superior brittleness characteristics,are prone to cracking,and have developed dissolved pores and caves along fractures,thereby enhancing storage and seepage properties.Evaluation of the E_(2)s_(4)^(d^(3)) reservoir revealed a small pore throat radius,poor sorting,small homogeneity coefficient,and inadequate pore structure.Effective reservoir formation predominantly relies on micropores and microfractures.Through the overlapping favorability method,six factors influencing reservoir development were integrated and assessed,including brittleness index,thickness of carbonate rock and analcitic mixed fine-grained rock,fracture density,average porosity,average permeability,and organic carbon content.Favorable zones for reservoir development are primarily distributed along the long axis of the lake basin,encompassing specific wells such as Lei 15,Lei 84,Lei 59,Shu 90,and Lei 93.This summary provides a comprehensive overview of the geological study,encompassing methodologies,findings,and implications for oil exploration in the Leijia area.

关 键 词：辽河坳陷 西部凹陷 细粒沉积岩 无监督学习 叠合概率 储层评价 

分 类 号：P597[天文地球—地球化学]