| 影响碎屑岩天然气储层物性的主要控制因素 |
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| 引用本文： | 史基安,王琪.影响碎屑岩天然气储层物性的主要控制因素[J].沉积学报,1995,13(2):128-139. |
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| 作者姓名： | 史基安 王琪 |
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| 作者单位： | 中国科学院兰州地质研究所 兰州 730000 |
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| 基金项目： | “八五”国家重点科技攻关项目 |
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| 摘 要： | 碎屑岩天然气储层，尤其是埋藏历史较长、埋深较大的致密碎屑岩天然气储层物性的控制因素比较复杂，本文通过对我国中新生代主要含气盆地的碎屑岩储气层埋藏历史和成岩阶段与孔隙度关系的研究，提出了按产状将碎屑岩储层孔隙分为粒间孔、粒间溶孔、组分内孔隙和裂隙四种类型的划分方案，分析了各类孔隙对砂岩孔渗性的贡献。从碎屑颗粒物理性质和化学性质；砂岩中泥质杂基和自生粘土矿物；沉积速度与埋藏历史；碎屑岩粒径和分选程度；泥质岩成岩作用；构造背景和构造运动以及镜质体反射率和有机质成熟度等方面讨论了它们对碎屑岩天然气储层物性的控制机理。
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| 关 键 词： | 碎屑岩 天然气储层 孔隙度 |
| 收稿时间： | 1994-10-15 |
A Disscussion on Main Controlling Factors on the Properties of Clastic Gas Reservoirs |
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| Institution: | Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000 |
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| Abstract: | There are lots of complicated controlling factors on tight clastic gas reservoirs, especially those with long burial history and great burial depth. According to reserches on the relationship between porosity and burial history as well as diagenetic stages of several Meso - Cenozoic gas - bearing basins in China, this paper has proposed a subdivision scheme of reservoir pore types in terms of their occurrence, which includes four types,that is, intergranular pore, intergranular dissolution pore, intraconstituent pore and fissures. Furthermore,the contributions to the improvenment of reservoir properties resulted from different pore types have been analysed. In addition, the controlling mechanism on the properties of elastic gas reservoirs has also been disscussed by individually dissecting multiple factors, such as physical and chemical properties of detrital grains;argillic matrix and authigenic clay minerals; sedimentation rate and burial history; grain size and sorting; agenesis of mudstone; tectonic setting and movement, vitrinite reflectance and organic maturity, and so on.As a result of the study, the authors believe that the properties of elastic gas reservoirs are comprehensively controlled by multiple factors. Pore spaces of reserviors, which have a short burial history and shallow burial depth, are mainly composed of primary pores. Depositional environment and physical property of detrital grains are dominant controlling factors. As for those tight reservoirs with a long burial history and great depth,the pore spaces are extremely complex, in which the intergranular and intraconstituent dissolution pores are very common. And the influencing factors are diversified, including depositional environment, tectonic setting, physical and chemical properties of detrital grain, burial history, nature of pore fluid and its influx state as well as diagenetic evolution characteristics of mudstone and organic matter. However, in different basins, all the factors mentioned above have played different role in controlling the reservoir evolution,and their action procedures are changable, but above all, the burial history and pore fluid conditions are theleading elements in controlling the properties of tight gas reservoirs. |
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