基于成岩相的深层碎屑岩优质储集层发育规律研究: 以塔里木盆地顺9井区柯坪塔格组为例

doi:10.7605/gdlxb.2023.06.075

摘要/Abstract

摘要： 为认识成岩相对深层碎屑岩优质储集层发育规律的影响,以塔里木盆地顺托果勒地区顺9井区志留系柯坪塔格组为例,利用岩心观察、薄片鉴定、扫描电镜、阴极发光等,分析了储集层岩石学和成岩作用特征,划分了成岩相类型,明确了成岩演化差异过程及优质储集层发育的控制因素。结果表明,柯坪塔格组储集层以岩屑砂岩、长石岩屑砂岩和岩屑石英砂岩为主,成岩作用以压实、碳酸盐胶结、溶蚀作用为主。根据成岩作用及成岩矿物将成岩相划分为4类,不同成岩相经历了差异演化过程: 不稳定组分溶蚀相受压实和胶结作用减孔后保留一定的粒间孔,经受溶蚀改造后物性得到明显改善; 碳酸盐胶结相和富刚性颗粒压实致密相受压实和胶结作用影响而减孔致密,导致溶蚀相对困难而最终形成致密储集层; 富塑性颗粒压实致密相压实作用最为强烈,在整个沉积过程中因持续压实而最终致密。不同成岩相的分布总体受沉积相控制,发育于潮坪潮道和三角洲分流河道的不稳定组分溶蚀相砂体是柯坪塔格组优质储集层,这种分布模式将为寻找深层碎屑岩有效储集层提供指导。

关键词: 塔里木盆地, 顺托果勒地区, 柯坪塔格组, 成岩相, 优质储集层

Abstract: In order to understand the influence of diagenetic facies on the development of high-quality reservoirs of deep clastic rock,this paper takes the reservoir of the Silurian Kepingtage Formation in the Shun 9 well area of Shuntuogole region in Tarim Basin as an example for study. The reservoir petrology and diagenetic characteristics were analyzed by using core observation,thin section identification,scanning electron microscope,cathodoluminescence and other data. The diagenetic facies types were classified,and differential diagenesis and control factors of high-quality reservoir development were clarified. The results show that the reservoir of the Kepingtage Formation is dominated by lithic sandstone,feldspar lithic sandstone and lithic quartz sandstone,and the diagenesis is dominated by compaction,carbonate cementation and dissolution. Diagenetic facies can be divided into four types according to diagenesis and diagenetic minerals. Different diagenetic facies have undergone different evolution processes. The unstable-components dissolution facies retains a certain amount of intergranular pores after porosity reduction by compaction and cementation,and its physical properties are significantly improved after dissolution transformation. The carbonate cemented facies and rich-rigid-grains compacted facies reduce porosity and density under the influence of compression and cementation,resulting in relatively difficult dissolution and finally forming tight reservoirs. The compaction of the rich-plastic-grains compacted facies is most intense. During the whole deposition process,continuous compaction leads to final compaction. The distribution of different diagenetic facies is generally controlled by sedimentary facies. The unstable-components dissolution facies sand body developed in the tidal flat,tidal channel and delta distributary channel comprises the high-quality reservoir of the Kepingtage Formation. This distribution pattern will provide guidance for finding deep effective reservoirs.

Key words: Tarim Basin, Shuntuogole region, Kepingtage Formation, diagenetic facies, high quality reservoir

中图分类号:

P618.130.2+1

陈海颖, 张立强. 基于成岩相的深层碎屑岩优质储集层发育规律研究: 以塔里木盆地顺9井区柯坪塔格组为例[J]. 古地理学报, 2023, 25(6): 1379-1393.

CHEN Haiying, ZHANG Liqiang. Study on the development of high-quality reservoirs of deep clastic rock based on diagenetic facies: taking the Kepingtage Formation in Shun 9 well area of Tarim Basin as an example[J]. JOPC, 2023, 25(6): 1379-1393.

http://www.gdlxb.cn/CN/Y2023/V25/I6/1379

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