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准噶尔盆地中拐地区上乌尔禾组储集层绿泥石膜成因及其对储集层物性的影响
单祥1,郭华军1,郭旭光2,徐洋1,曹元婷2,李亚哲1,王力宝1
(1.中国石油杭州地质研究院,浙江杭州 310023;2.新疆油田公司勘探开发研究院,新疆克拉玛依 834000)
摘要:
以准噶尔盆地中拐地区上乌尔禾组砂砾岩储集层为例,利用铸体薄片、电子探针、扫描电镜、物性等资料,对陆相岩屑砂砾岩中发育的绿泥石膜微观特征、成因及其与储集性能之间的关系进行详细研究。结果表明:上乌尔禾组绿泥石膜为偏富铁型,且具有双层膜结构,近颗粒一侧里层膜连续性好、致密、晶体小;近孔隙一侧的外层膜连续性差、疏松、晶体大;绿泥石膜由先存黏土膜转化而来,形成于温度小于70 ℃的早成岩阶段;绿泥石膜对碎屑石英的次生加大有抑制作用,但不能阻止自生石英晶粒在孔隙中沉淀,更不能阻止浊沸石、方解石胶结物的沉淀,也不能抑制机械压实作用,其对储集层孔隙保存贡献较小,对优质储层起指示作用。
关键词:  绿泥石膜  成岩作用  硅质胶结  储集性能  上乌尔禾组  准噶尔盆地
DOI:10.3969/j.issn.1673-5005.2019.06.004
分类号::P 571
文献标识码:A
基金项目:“十三五”国家科技重大专项(2017ZX05001-002)
Genesis of chlorite coatings and their effects on reservoir quality in Upper Urho Formation of Zhongguai area, Junggar Basin
SHAN Xiang1, GUO Huajun1, GUO Xuguang2, XU Yang1, CAO Yuanting2, LI Yazhe1, WANG Libao1
(1.Hangzhou Research Institute of Geology, PetroChina, Hangzhou 310023, China;2.Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China)
Abstract:
Taking sandstones of Permian Upper Urho Formation for example and combining the analysis of casting thin section, electronic probe, SEM, and sandstone physic property, this article studied the chlorite coatings micro features, genesis and their effects on continental sandstone quality. Several results are acquired as follows:the chlorite coatings of Upper Urho sandstones are Fe-rich with a "two-layer structure". The inner parts adjacent to grains are more continuous, denser, and finer-crystalline, while the outer parts adjacent to pores are less continuous, thinner and coarser-crystalline. The chlorite coatings of Upper Urho sandstones are transformed from clay precursors during eodiagenetic stage at temperature lower than 70 ℃. Chlorite coatings can inhibit detrital quartz form overgrowth, but they can not effectively inhibit authigenic quartz, laumontite and calcite from precipitation in primary pores and mechanic compaction. However, the occurrence of chlorite coatings is a barometer of a good quality reservoir.
Key words:  chlorite coatings  diagenesis  quartz cementation, sandstone reservoir quality  Upper Urho Formation  Junggar Basin
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