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首页> 外文期刊>Marine and Petroleum Geology >Characteristics and origin of the major authigenic minerals and their impacts on reservoir quality in the Permian Wutonggou Formation of Fukang Sag, Junggar Basin, western China
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Characteristics and origin of the major authigenic minerals and their impacts on reservoir quality in the Permian Wutonggou Formation of Fukang Sag, Junggar Basin, western China

机译：主要的Authigenic矿物质的特征和起源及其对福田楼武龙沟楼楼楼楼梯素质的影响

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摘要

This research is focused on the characteristics and origin of major authigenic minerals and the influences on the reservoir quality of the Permian Wutonggou Formation sandstones in the eastern slope of Fukang Sag, Junggar Basin, Western China. Authigenic cements were observed and described from thin sections, scanning electron microscopy, fluorescence, and cathodoluminescence. The elemental concentrations of the authigenic minerals were measured by electron probe microanalysis. Additional characterizations were obtained from O and C stable isotope ratios and from the homogenization temperature of aqueous fluid inclusions. The results show that the sandstones in the Wutonggou Formation are dominated by volcanic lithic fragments. Carbonates and laumontites are the major authigenic minerals in the study area. Authigenic quartz and kaolinite can also be observed. Two types of carbonate cements are identified. The first type is calcite with yellow fluorescent hydrocarbon inclusions. The carbon and oxygen isotopes in the calcites are highly C-depleted and O-depleted. The homogenization temperatures of the aqueous fluid inclusions in the calcite cements are higher than the highest paleogeo-temperatures during the burial history. Combined with the presence of authigenic fibrous illites and the illitization of kaolinites, it is determined that the precipitation of the calcites is related to the upwelling of deep fluids and was impacted by the CO, from the thermal decarboxylation of organic matters during the middle-late Jurassic. The second type is ferroan calcite with blue fluorescent hydrocarbon inclusions and higher contents of Fe, Mn, Cr, and Mg than in the calcites. The ferroan calcites in the Beisantai uplift are rich in C-13 (delta C-13 (v-pDB) values are +22.10 parts per thousand and +22.16 parts per thousand). The precipitation of these ferroan calcites was impacted by the CO, from crude oil biodegradation after the late Jurassic. Two types of laumontites are identified. The first type is partially dissolved and is characterized by a high Ca/Na ratio and low Fe contents. The second type is hardly dissolved, has hydrocarbon inclusions with yellow and blue fluorescence, and is characterized by a low Ca/Na ratio and high Fe contents. The first type of laumontite was precipitated prior to hydrocarbon charging and the second type was formed after hydrocarbon charging and meteoric water leaching. The hydration of the volcanic debris provided the source materials for both types of laumontite. The authigenic quartz and kaolinite were formed by the alteration of feldspars, laumontites, and volcanic materials. The evolution of the reservoir properties was impacted by various degrees of cementation and dissolution; as a result, the reservoir quality in the Beisantai uplift was better than in the Shaqiu area.
机译：本研究专注于主要的Authigenic矿物质的特点和起源以及对中国西部的Junggar Bougin东坡二叠岩梧桐树木地层砂岩储层质量的影响。从薄切片，扫描电子显微镜，荧光和阴极发光中观察和描述了Aheathigenic PENTEN。通过电子探针微透析测量了Aheatigenic矿物的元素浓度。从O和C稳定同位素比率和含水液体夹杂物的均化温度获得另外的表征。结果表明，梧桐沟地层中的砂岩由火山岩碎片主导。碳酸盐和Laumontites是研究区的主要Aherigenic矿物质。也可以观察到Aheyigenic石英和高岭石。鉴定了两种类型的碳酸盐水泥。第一类是具有黄色荧光烃夹杂物的方解石。燃料中的碳和氧同位素高度C-耗尽和O-耗尽。方解石水泥中的含水流体夹杂物的均化温度高于墓葬历史期间的最高古片温度。结合存在的纤维状灯节的存在和高岭土的ildit化，确定燃士的沉淀与深液的升高有关，并且由CO的越来越长，从中期有机物质的热脱羧侏罗纪。第二种类型是具有蓝色荧光烃夹杂物的铁燃铁，Fe，Mn，Cr和Mg的更高含量而不是燃烧石。 Beisantai隆起中的Ferroan Callites富含C-13（Delta C-13（V-PDB）值，值+22.10份，每千份+22.16份）。这些碳钙钙的沉淀受到侏罗纪后期原油生物降解的影响。确定了两种类型的LauNtites。第一类部分溶解，其特征在于高Ca / Na比和低Fe含量。第二种类型几乎不溶解，具有黄色和蓝色荧光的烃夹杂物，其特征在于低Ca / Na比和高Fe含量。在碳氢化合物充电之前沉淀出第一类Laumontite，并且在碳氢化合物充电和流苏浸出后形成第二种类型。火山碎片的水合提供了两种类型Laumontite的源材料。通过更换长石，Laumontites和火山材料形成的Aheyigenic石英和高潮。储层性质的演变受到各种胶结和溶解的影响;因此，北岛隆起的水库质量优于沙丘地区。

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