Diagenesis and its impact on the reservoir quality of the fourth member of Xujiahe Formation, Western Sichuan Depression, China
Diagenesis and its impact on the reservoir quality of the fourth member of Xujiahe Formation, Western Sichuan Depression, China
复制标题
川西坳陷须四段成岩作用及其对储层质量的影响
DOI：
10.1016/j.marpetgeo.2019.03.011
复制
发表时间：
2019-05
影响因子：
4.2
通讯作者：
Jin Aimin
中科院分区：
文献类型：
--
作者：
Li Mengyao;Zhu Rong;Lou Zhanghua;Yin Wei;Hu Zongquan;Zhu Hongquan;Jin Aimin
川西坳陷须家河组四段（T3 × 4）是我国典型的致密气砂岩。该岩段由三种类型的砂岩组成：岩屑砂岩、次岩屑砂岩和长石岩屑砂岩。这些砂岩中的一些含有大比例的碳酸盐岩碎片。这些钙质砂岩（CCS）可以与普通砂岩（OS）区分开来。四段储层物性较差（平均孔隙度5.9%，平均渗透率1.41mD）。These.properties受几种成岩过程的影响，包括压实、长石溶解、碳酸盐胶结物的沉淀和粘土胶结。矿物分布模式和定量数据表明，T3 × 4砂岩中的自生石英主要来源于SeI反应、长石溶解和高岭石伊利石化。石英胶结物仅占储集空间的一小部分。碳酸盐胶结作用。（主要是方解石）在研究区占主导地位。矿物分布模式和同位素组成趋势表明，砂岩中的碳酸盐胶结物既有来自砂岩内部的，也有来自砂岩外部的。无机碳酸盐岩碎屑的溶解作用是CCS中碳酸盐胶结物的主要内碳源。在操作系统中，贡献要小得多。泥岩干酪根热演化生成的有机碳通过扩散迁移到砂岩中，是有机质的主要碳源。川西坳陷须三段储层砂岩由于韧性碎屑压实作用和碳酸盐胶结作用的共同作用，孔隙度较低。在T3 × 4砂岩中，碎屑韧性颗粒含量和碳酸盐胶结物含量均较低的样品孔隙度最高。
The fourth member of the Xujiahe Formation (T 3 x 4 ) in the Western Sichuan Depression is typical of the tight gas.sandstones of China. The member is composed of three types of sandstone: litharenite, sublitharenite, and.feldspathic litharenite. Some of these sandstones contain a large proportion of carbonate rock fragments. These.calcarenaceous sandstones (CCSs) can be differentiated from ordinary sandstones (OSs). The reservoir properties.of the fourth member are quite poor (average porosity = 5.9%, average permeability = 1.41 mD). These.properties were influenced by several diagenetic processes, including compaction, feldspar dissolution, pre-.cipitation of carbonate cements, and clay cementation. Mineral distribution patterns and quantitative data show.that the authigenic quartz in T 3 x 4 sandstones is mainly sourced from SeI reactions, feldspar dissolution, and.kaolinite illitization. Quartz cements occupy only a small fraction of the reservoir space. Carbonate cementation.(primarily calcite) is dominant in the research area. Mineral distribution patterns and isotopic composition.trends suggest that the carbonate cements in the sandstones originated both inside and outside of the sandstones..Dissolution of inorganic carbonate rock fragments is the main internal carbon source of carbonate cements in.CCSs. In OSs, the contribution is much smaller. Organic carbon derived from the thermal evolution of kerogen in.the mudstones that migrated into sandstones via diffusion is the main carbon source in OSs. Due to a combi-.nation of compaction of ductile fragments and carbonate cementation, T 3 x 4 reservoir sandstones in Western.Sichuan Depression exhibit low porosities. In T 3 x 4 sandstones, porosity is highest for samples where both the.detrital ductile grain content and carbonate cement content are low.
登录
查看更多内容
影响因子：
3.5
作者：
Grete Block Vagle;A. Hurst;H. Dypvik
通讯作者：
Grete Block Vagle;A. Hurst;H. Dypvik
DOI：
--
发表时间：
2008
期刊：
Geology in China
影响因子：
--
作者：
Zheng Rong-cai
通讯作者：
Zheng Rong-cai
影响因子：
1.5
作者：
S. Barclay;R. Worden
通讯作者：
S. Barclay;R. Worden
影响因子：
3.9
作者：
R. Worden;S. Barclay
通讯作者：
R. Worden;S. Barclay
影响因子：
1.8
作者：
S. De
通讯作者：
S. De