天然气地质学

基于CT成像技术的塔里木盆地寒武系白云岩储层微观表征

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  • 1.中国石油天然气集团公司碳酸盐岩储层重点实验室,浙江 杭州 310023;
    2.中国石油杭州地质研究院,浙江 杭州 310023;
    3.中国石油塔里木油田分公司,新疆 库尔勒 841000
郑剑锋(1977-),男,浙江龙游人,高级工程师,硕士,主要从事碳酸盐岩沉积、储层研究. E-mail:zhengjf_hz@petrochina.com.cn.

收稿日期: 2015-06-19

  修回日期: 2015-07-28

  网络出版日期: 2019-09-20

基金资助

国家科技重大专项“大型油气田及煤层气开发”(编号:2011ZX05004-002);中国石油天然气股份有限公司重大科技专项“深层油气勘探开发关键技术研究”(编号:2014E-32-02)联合资助.

Microstructure characterization based on CT imaging technology of Cambrian dolomite reservoir in Tarim Basin

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  • 1.Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou 310023,China;
    2.PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;
    3.Tarim Oil field Company,PetroChina,Korla 841000,China

Received date: 2015-06-19

  Revised date: 2015-07-28

  Online published: 2019-09-20

摘要

储层微观表征能为储层有效性判识提供重要依据,传统铸体薄片鉴定、扫描电镜、压汞分析等表征手段对复杂孔喉结构的碳酸盐岩具有局限,并且不能进行三维表征。利用基于CT成像技术的储层微观表征方法,对塔里木盆地寒武系8个代表8种储集空间类型的白云岩样品进行不同尺度地三维扫描,并定量计算了孔喉结构参数。CT成像清晰展示了晶间孔、晶间溶孔、溶蚀孔洞、粒间孔、粒内孔、藻格架孔、膏模孔和微裂缝8种储集空间在三维空间中的形态、大小、连通情况及分布特征;三维孔喉结构模型和孔隙度、孔喉半径、数量、连通性等参数定量地表征了储层的有效性。通过对比这些参数,可以看出孔隙分布均匀、孔隙度大、连通性好的白云岩是构成优质白云岩储层的基础,因此综合判断溶蚀孔洞是最有效、最重要的储集空间,晶间溶孔、粒间溶孔和藻格架(溶)孔次之。该方法为塔里木盆地规模、有效白云岩储层的判断提供了新手段。

本文引用格式

郑剑锋, 陈永权, 倪新锋, 严威, 黄理力, 张艳秋 . 基于CT成像技术的塔里木盆地寒武系白云岩储层微观表征[J]. 天然气地球科学, 2016 , 27(5) : 780 -789 . DOI: 10.11764/j.issn.1672-1926.2016.05.0780

Abstract

Reservoir microstructure characterization is a basis to identify the effectiveness of reservoir.The traditional methods such as casting thin sections,scanning electron microscope and mercury intrusion have limitation to characterize carbonate reservoir,furthermore,they can't characterize the 3D features of pores and throats.Using CT imaging technology,8 typical dolomite samples which represent 8 different reservoir spaces of Cambrian in Tarim Basin were scanned and their pore-throat structural parameters were calculated.CT images 3D structure models clearly show the shape,size,connectivity and distribution characteristic of intracrystalline pore,intercrystalline dissolved pore,vug,intergranular pore,intragranular dissolved pore,algae framework pore,Gypsum-dissolved pore and fracture in 3D space;The structure parameters of pore-throat such as porosity,radius,quantity and connectivity can quantitatively characterize the effectiveness of the dolomite reservoir.By comparing these parameters,it can be known that the dolomite with evenly distributed pores,high porosity and connectivity can be a high-quality dolomite reservoir,so vug is the most effective and important reservoir space,intracrystalline pore,intercrystalline dissolved pore and intergranular pore are second.This method provides a new way for the judgment of the scale and effectiveness of dolomite reservoir in Tarim Basin.

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