中等地温

发布时间：2018-05-02 22:55

本文选题：埋藏史 + 热史　；参考：《地球科学进展》2017年07期

【摘要】：以鄂尔多斯盆地延安地区下石盒子组储层为研究对象,在储层成岩作用、埋藏史与热史研究的基础上,应用动力学模型与作用模拟方法分析了该区孔隙度演化史。结果表明,中等地温场、长深埋期煤系地层内的石英砂岩类储层,成岩早期孔隙介质呈酸性而缺乏早期碳酸盐胶结物,压实损失孔隙度较大;溶蚀作用产生了一定的次生孔隙,但长深埋期、较高地温环境下溶蚀产物沉淀为更为稳定的次生石英和黏土矿物,加之含铁碳酸盐胶结物的胶结与交代,造成粒间孔隙大量封闭的同时,又充填了部分溶孔;压实损失孔隙度较大的情况下,石英次生加大的普遍发育及黏土矿物与含铁碳酸盐胶结物的充填,往往造成此类储层为低渗—超低渗储层。
[Abstract]:Based on the study of diagenesis, burial history and thermal history, the porosity evolution history in Yanan area of Ordos Basin was analyzed by means of dynamic model and action simulation method. The results show that in the medium geothermal field, quartz sandstone reservoirs in the coal measure strata of the long and deep buried period, the early diagenetic pore media is acidic, but the early carbonate cementation is lacking, the compaction loss is larger, and the dissolution produces certain secondary pores. However, in the long and deep burial period, the dissolution products are precipitated into more stable secondary quartz and clay minerals under higher geotemperature environment, together with the cementation and metasomatism of iron-bearing carbonate cementation, which results in a large amount of sealing of intergranular pores and filling of some dissolved pores. When the compaction loss porosity is large, the secondary increase of quartz and the filling of clay minerals with iron-bearing carbonate cement often result in the formation of low-permeability and ultra-low permeability reservoirs.
【作者单位】：延长油田股份有限公司志丹采油厂;陕西延长石油(集团)有限责任公司;
【基金】：国家自然科学基金项目“特低渗透双重介质砂岩微观孔隙结构的定量表征”(编号:41102081)资助~~
【分类号】：P618.13

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