四川盆地白云岩成因的研究现状及存在问题  

Research status of dolomite genesis and its problems in Sichuan Basin

作　　者：刘树根[1] 黄文明[1] 张长俊[1] 赵霞飞[1] 戴苏兰[2] 张志敬[1] 秦川[1] 

机构地区：[1]成都理工大学“油气藏地质及开发工程”国家重点实验室 [2]四川省产品质量监督检验检测院

出　　处：《岩性油气藏》2008年第2期6-15,共10页Lithologic Reservoirs

基　　金：国家重点基础研究发展计划“973”项目(编号:2005CB422106)

摘　　要：四川盆地上震旦统到中三叠统主要是海相碳酸盐岩沉积,勘探已发现震旦系、寒武系等15个碳酸盐岩含气层系。其中,上震旦统与寒武系碳酸盐岩基本上完全白云石化,其余层位也具有不同程度白云石化。对四川盆地海相碳酸盐岩储层白云岩成因机理或模式,不同学者具有不同的解释,主要有原生、准同生、渗透回流、混合水、埋藏成因、热液成因、淋滤玄武岩成因及生物成因等8种模式。白云岩储层是现今四川盆地碳酸盐岩最为重要的油气储集层之一,白云石化是四川盆地碳酸盐岩优质储层发育的必要条件。四川盆地海相碳酸盐岩白云石化埋藏成因模式与混合水模式受到广泛质疑,可能为热液成因。四川盆地海相碳酸盐岩中2次地裂运动及其导致的广泛的流体活动背景,致使热液白云石化可能比我们想象的更为普遍。The formations from the Upper Sinian to Middle Triassic in Sichuan Basin are marine deposits and mainly composed of carbonate rocks. Through 50 years petroleum exploration, fifteen carbonate gas-bearing beds have been found in the basin. Among them, carbonate rocks of Upper Sinian and Cambrian have been completely dolomitized, and the others also have dolomitization more or less. There are various explanations for the genetic model of dolomite in marine carbonate reservoir in Sichuan Basin, mainly including： protogene, penecontemporaneous, reflux, meteoric-seawater mixing water, burial, hydrothermal fluid, leaching of basalt and biogenesis. Dolomite reservoir is regarded as one of the most important carbonate reservoir, and the dolomitization is the prerequisite for the development of high-quality carbonate reservoirs in Sichuan Basin. The burial dolomitization and meteoric-seawater mixing dolomitization of marine carbonate rocks have been widely queried, and there are two taphrogenesis events and related extensive fluid activities in marine carbonate rocks in Sichaun Basin, so hydrothermal dolomitization could be more widespread than previously thought in Sichuan Basin.

关 键 词：白云岩成因 碳酸盐岩 热液白云石化 四川盆地 

分 类 号：P581[天文地球—岩石学] P588.245[天文地球—地质学]