油层砂岩成岩作用及其对储层性质的影响  

Diagenesis of Chang 6 formation sandstones and its effect on reservoir property in sanyan regions in ordos basin

作　　者：付国民[1] 李鑫[1] 梁志录 车明[3] 李园园[1] 

机构地区：[1]长安大学资源学院 [2]甘肃地勘局第三勘察院,甘肃兰州730030 [3]长庆油田分公司第四采油厂,陕西靖边718500

出　　处：《西安科技大学学报》2007年第3期377-381,共5页Journal of Xi’an University of Science and Technology

基　　金：国家重点基础研究发展计划973项目(2003CB214601)

摘　　要：陕北三延地区三叠系延长组长6油层为典型低孔、特低渗储层,该类储层成岩作用类型非常复杂,在埋藏成岩过程中各种成岩作用对砂岩的原生孔隙的保存和次生孔隙的发育都产生重要影响,从而控制了储层物性纵横向变化;强烈的压实作用及胶结作用导致原生孔隙丧失殆尽,是形成特低孔渗储层的主要原因,而较弱的晚期溶蚀作用,特别是方解石、浊沸石溶解对储层的改善发挥较大作用,才使鄂尔多斯盆地延长组发育部分亮点储层,成为有利的储集-成岩相带。The reservoir quality of the Upper Triassic Chang 6 formation of Sanyan regions in north Shaanxi Province is typical low porosity and the lowest permeability. The categories of diagenesis are complex. During the burial diagenetic process, each diagenesis produces signiphicant effect on the primary porosity preservation and the second porosity growing, consequently it controls the reservoir physical property＇s longitudinal-landscape orientation variation. Intensity compaction and cementation resulted in the primary porosity loss at all. It is the main reason which formed the low porosity and the lowest permeability; however, the later weak dissolution, especially calcite dissolution and laumonite dissolution make a great effect for improvement reservoir permeability, hence, there are some efficient reservoir and become advantaged reservoir-diagenetic facial belt in Yanchang formation in Ordos basin.

关 键 词：成岩作用 储层性质 长6油层 三延地区 

分 类 号：P313.3[天文地球—固体地球物理学]